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  1. Tow Bar Braking Systems
  2. Chevrolet
  3. TrailBlazer
  4. 2004
  5. Brake Buddy
FITS 2004 Chevrolet TrailBlazer
Brake Buddy Select 3 Portable Flat Tow Brake System - Proportional

Brake Buddy Select 3 Portable Flat Tow Brake System - Proportional

Item # HM39524
Retail:$1,791.00
Our Price: $1,536.92
You Save: $254.08
Tow Bar Braking Systems
Confirmed to Fit
2004 Chevrolet TrailBlazer

with electric seats

without electric seats

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Call etrailer.com at 1-800-940-8924 for expert service. We are your Chevrolet tow bar braking systems experts, and offer a great price. etrailer.com carries a complete line of Brake Buddy products for your Chevrolet TrailBlazer 2004. Brake Buddy Select 3 Portable Flat Tow Brake System - Proportional part HM39524 from Brake Buddy can be ordered online at etrailer.com. Complete tow bar braking systems installation instructions and technical support.
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2004 Chevrolet TrailBlazer - Brake Buddy Select 3 Portable Flat Tow Brake System - Proportional

  • Brake Systems
  • Air Brakes
  • Air Over Hydraulic Brakes
  • Hydraulic Brakes
  • Proportional System
  • Brake Buddy
  • Portable System

This portable unit gets you smooth braking without a complex installation. Senses the RV braking and applies the brakes proportionally. Easy to swap between multiple towed cars: settings adjust for safe, even braking for any size car.


Features:

  • Applies towed vehicle's brakes proportionally for comfortable braking
    • Measures motorhome's braking and activates car's brakes with same intensity
    • Prevents false braking with terrain-sensing technology
  • Lets you adjust force and sensitivity for smooth braking
  • Swaps easily between multiple towed vehicles
    • Requires a second vehicle kit (BB59SR - sold separately) for each alternate car
  • Adjusts easily to fit in almost any vehicle
    • Sits level for optimal performance thanks to adjustable feet
    • Clamps easily around almost any brake pedal
  • Allows you to control and monitor braking with handy wireless remote
    • Plug into 12V accessory outlet or use with AA batteries
    • Easily check readouts for potential problems
    • Change braking modes and settings from the cab of your RV
  • Gets ready to tow with 1-touch auto start
    • Removes excess vacuum pressure from your car's brakes
    • Checks braking system for errors
  • Keeps car's battery fully charged with 15-amp battery charge line kit


Specs:

  • Compatible with hybrids and other cars with electric power-assist brakes
  • Dimensions: 19" long x 11-3/4" wide x 6-3/4" tall
  • Power draw at 12V: 15 amps
  • Range of adjustable feet: 1" - 4" tall
  • Power harness length: 36"
  • Weight: 12 lbs
  • 5-Year limited warranty


Do I Need a Braking System for Flat Towing?

A braking system is a must when towing a vehicle behind your motorhome. Without it, the weight of the towed car can create a safety hazard, strain your RV's brakes, and affect the warranty of both your car and motorhome. Most states legally require a supplemental braking system, so if you don't use one and you end up in an accident (which is more likely since your RV takes longer to come to a full stop), your insurance and liability headache just doubled. You also won't have any breakaway system; if there's an accidental disconnect, there's nothing to bring your car to a stop.


Pros of a Portable System

First, this system is great for DIYers, since you can get the basic installation done yourself. There will be some minor wiring to do under the hood and in the cab, but that's as complicated as it gets.


Second, it offers you a lot of flexibility. It's easy to move from one toad (towed vehicle) to another - or, if you think you'll likely get a new car down the road, you can easily set the Select 3 up in your new toad.


How Does the Brake Buddy Work?

The Brake Buddy Select 3 uses a built-in inertia sensor to detect when your flat tow setup begins to slow down as you apply the brakes in your motorhome. The moment the system recognizes the change in momentum, the actuator will press down the brake pedal of your toad proportionally: at the same time, with the same intensity. Meanwhile, the terrain-sensing technology keeps the unit from activating when you go over bumps in the road, so it doesn't brake when it doesn't need to.


Compatible with Hybrids and Continuous-Power-Assist Brakes

If you're towing a hybrid or any car with continuous-power-assist brakes, all you have to do to be able to use the Brake Buddy is change the Braking Mode to Hybrid.


Setting Up the Brake Buddy Select 3

You'll be setting up this portable unit in your toad every time you flat tow, so it's designed to be easy to do. And because it's so adjustable, it fits in almost any vehicle on the market.


setting up the Brake Buddy Select 3

Step 1: Position the Brake Buddy

Shift the driver's seat back and set the Select 3 on the floorboard. It's important that the unit sits as level as possible so the actuator has enough leverage to effectively push down the brake pedal, so adjust the feet of the unit to suit your floorboard if need be.


how to adjust feet of Brake Buddy Select 3

Each foot can be adjusted easily by hand or with the included wrench. Twist it counterclockwise, pull it down to the right length, and then twist clockwise to lock it in place.


Quick Tip: It's best to remove your vehicle's floor mat before installation to keep the Brake Buddy from shifting.


Step 2: Attach the brake pedal clamp

Brake Buddy Quick-Lock Clevis

Next you need to get the clamp attached to the brake pedal with the Quick-Lock clevis. This adjustable clevis is designed to securely clamp onto the pedal regardless of its size or shape. Once you have the clevis fixed around the pedal, turn the lever to tighten it in place.


Step 3: Plug in and power up

Brake Buddy Select AutoStart

Plug your Brake Buddy into the connector you'll have installed under the dashboard and then press the Auto Start button. The system will automatically boot up to your saved settings and then check your brakes, pushing and releasing the brake pedal several times to remove built-up vacuum pressure from the brakes and prevent over-braking. It will also check for any connection errors. Then you're ready to flat tow!


Braking Power Settings

Brake Buddy Select Control Panel

The braking power settings control how intensely the Brake Buddy Select 3 applies your toad's brakes. When you are first setting up the Brake Buddy, choose the setting that's recommended for a vehicle of your toad's size:


Vehicle Type Recommended Braking Power
Hybrids 10 - 20 psi
Cars and Compact SUVs 25 - 45 psi
Small Crossovers 25 - 45 psi
Crossovers and Small SUVs 35 - 65 psi
Mid-Size Pickups 35 - 65 psi
Large SUVs and Pickups 45 - 75 psi


After selecting an initial setting, press the plus or minus buttons on the control panel to fine-tune the power. The setting should be enough that your toad gives a slight tug at your RV when you brake. On the right setting, you won't be at risk of damage from over-braking. Once you've set the braking power, it shouldn't need to be changed unless you tow a different vehicle.


You can also customize the sensitivity. This determines how aggressively you need to brake in the motorhome for the Brake Buddy to activate your toad's brakes. If you set the sensitivity high, then your car's brakes will activate with just a light tap of your RV's brakes. Low sensitivity will mean the system only activates when your motorhome brakes significantly.


Full Braking

You can also select the full-braking mode. When in this mode, the Brake Buddy will activate your toad's brakes at the maximum preset intensity, regardless of how intensely your RV is decelerating. The full-braking setting is ideal for when you're towing a heavy truck or SUV, or if you're towing your car down a steep incline. By setting the power to a higher level, you can ensure that the momentum of your toad won't cause it to push against your motorhome.


Easy Remote Operation

Brake Buddy Select Remote

It's important to monitor your toad's braking to make sure that everything's working the way it should. With the included remote, you can also control the Brake Buddy from the cab of your RV! It's just like having a brake controller in your motorhome.


With the remote, you can easily switch from proportional braking to full braking and vice versa with the push of a button. You can also change the Brake Buddy's sensitivity settings, which makes it easy to fine-tune the braking as you drive so that you can adjust based on feel. Finally, the remote will illuminate to alert you of any errors with the Brake Buddy system, including a breakaway event.


Breakaway System

The Brake Buddy also comes with a breakaway switch, an absolute must for safe flat towing. If there's ever an emergency situation where your toad becomes detached from the motorhome, the breakaway switch will immediately activate the brakes and bring your vehicle to a stop.


This switch mounts to the front of your toad and plugs directly into the unit. It includes a pin that connects to your RV's hitch receiver with a breakaway cable. If the toad and RV become disconnected, the cable will pull the pin out of the switch and trigger the braking system. A reserve air supply in the operating unit will then apply the brakes in the car.



39524 BrakeBuddy Select Three Portable Supplemental Braking System by Hopkins

Installation Details HM39524 Installation instructions

California residents: click here


Customer Satisfaction Score:


Customer Reviews

Brake Buddy Select 3 Portable Flat Tow Brake System - Proportional - HM39524

Average Customer Rating:  4.5 out of 5 stars   (274 Customer Reviews)

This portable unit gets you smooth braking without a complex installation. Senses the RV braking and applies the brakes proportionally. Easy to swap between multiple towed cars: settings adjust for safe, even braking for any size car.

by:
2003 Jeep Wrangler

It took me awhile to figure out how to set it up in my "Tiny Jeep" (TJ). I finally tried flipping the bracket for the brake pedal upside down, and that moved the connecting bracket forward just enough to where the shaft fit in the bracket. Used it once, about a month ago, and couldn't even tell the Jeep was connected to the motorhome. The tow vehicle is a 2023 Tiffin Wayfarer. The tow is a 2003 Jeep Wrangler TJ.



by:

Had a problem with the connection to the unit but called etrailer and they sent me a new one after sending the other back to them. The hole process very painless and the the staff at etrailer was great to work with. Thank you etrailer for your great response.

David E.

4/5/2024

Works well great addiction to towing car

Etrailer Expert

Jerred H.

5/8/2024

@DavidE Happy to hear that! Thanks for the feedback!


by:
2024 Jeep Wagoneer L

I am still scratching my head on the placement of the Main Unit. The floorboard area of the 2024 Jeep Wrangler is very small. The 2 levels of the rear of the unit are such that I can't seem to get the right height to stabilize the unit. The seat can be brought slightly forward but does not contact or even come close to the Handle when raised. With the plunger all the way in, there is hardly one half (1/4") inch of clearance before beginning to press the brake pedal. I can't find anyone else that has installed this unit. HELP please.

Etrailer Expert

Katrina D.

3/7/2024

Well scratch your head no more, George! Help is on the way! I have gotten in contact with Hopkins (Brake Buddy) and they have confirmed that when it comes to installing this Select 3 Portable Braking system on a Jeep Wrangler, you may need a Brake Buddy Clevis to help fill in that gap. This Clevis is Jeep specific and is generally provided by Brake Buddy themselves. I have gotten one ordered for you and you should receive it soon. Please get in touch with me when you receive it and let me know if you are needing any further assistance.



by:
2018 Jeep Wrangler

I LIKE THE BRAKE BUDDY SYSTEM FOR MY 2018 JEEP WRANGLER BUT THE DESIGN OF THE CONNECTION TO THE BRAKE PEDAL IS SOMEWHAT HARD TO GET CONNECTED. THE "CLAWS" SEEM TO WANT TO MOVE THE RUBBER COVER OFF THE PEDAL. THE ANGLE ALSO SEEMS TO ALWAYS WANT TO MOVE THE BRAKE BUDDY TOWARD THE DRIVER DOOR.



by:

Once I got the right brake mount clamp and had the power cord from car to controller replaced, the unit has worked great, thank you.

Don

2/3/2024

Still great.



by:

It worked like it should. I did have to bend the connector on my brake buddy harness to make it stop shutting off when I 1st got it. It has been fine ever since.



by:
2020 Dodge Charger

First off, the great folks at etrailer had the kit pulled, labeled and ready for the shipper to pick it up literally within a few hours after I ordered it. Impressive to say the least. The Brake Buddy is packaged in an organized and protective layout with minimal assembly required.

Installation was pretty straightforward. If you can understand a pictogram of wiring, it’s a no-brainer for the charger and cab receptacle. Tow vehicle I installed it in is a 2020 Jeep JL. There’s a round firewall plug under the brake booster that makes for a great spot to run your wires through the firewall which makes installation a breeze.

The brake pedal clamp in the JL appears more functional if installed inverted. That gets the clevis reachable up top while keeping the actuator arm closest to level. The seat needs to be all the way back as wrestling the Brake Buddy into the floorboard is tight. There’s no room on the floorboards for vacuuming, even less for a portable brake module. The front leveler legs need to be fully extended, the one closest to the door on the rear, 90% extended and the rear interior one will only need an inch out.

Once installed and powered up, the compressor runs to charge the actuator control. Press the auto start and it pumps the brake pedal to eliminate any residual vacuum boost. I set the operating pressure to 45, sensitivity to mid and mode to proportional. I’ll fine tune it once we get out on the road. At this juncture, everything was in the kit, everything appears to work and etrailer filled the order with urgency and care!



by:
Jeep Wrangler

I looked at several supplemental braking units and wanted one that was portable with nice features like wireless monitoring and parameter changes while flat towing my Jeep Wrangler. I reviewed the videos on the etrailer site for features and installation instructions, they’re well done and really helped with my buy decision and installation guidance. I decided on the Select 3 mainly because of the option for full or proportional braking, as I live in CA and take my RV through mountain passes often. The installation was straight forward with the help of the etrailer videos, very well done. The initial testing of the unit was a bit tricky, but it worked, after leveling the unit out. The first trip with the unit was from Southern CA to Paso Robles through the “Grapevine” pass and some other large hills, the unit worked well and gave me the extra braking I needed while flat towing my jeep behind my RV. During this trip, the unit was inconsistent in bleeding the brakes upon startup. I shared this information with etrailer in detail, and they sent me a replacement unit after trouble shooting. I want to thank etrailer for excellent support of a product which I entrust the safety of my family to while in use. The new unit has been wonderful on two other trips so far. I’m very happy with the performance and ease of use for the Select 3. It just takes a few minutes to position in the jeep, activate and get going down the road after the initial install was complete, which only took a few hours to run simple wiring. The unit is not very large or heavy, and easily fits in a normal storage compartment of the RV when we arrive at our destination. I look forward to many more trips with my family in our RV and the Select 3 giving us the supplement braking we need in our jeep on any road type.



by:

Don't really like this system and decided to just tow without a braking system at all and all is good by doing so. This unit is awkward, expensive and a pain to use

Etrailer Expert

Katrina D.

10/28/2023

I would definitely look into your states laws on pulling a trailer with or without a braking system. For instance, in Missouri, by law a supplemental braking system is not required except on trailers coupled by a 5th-wheel and kingpin. While in Idaho the law states "Trailers with an unloaded weight of 1,500 lbs. must have an independent braking system, and a breakaway system." Please double check your states laws before proceeding without a braking system.



by:

The proportional breaking never worked right and on our last trip the system kept cutting out until it quit working all together. I was in the southern US and had to drive back to Canada without the aid of the breaking system. i tried to check it out and fix it but was unable to get continuous power to the brake buddy.



by:

Hi Miranda, here are the pictures of the bracket and Brake Buddy installed in my Jeep. Works very well. I tried to move the seat forward a bit but when the Brake Buddy activated it pushed the seat adjuster and moved the seat all the way back. Thank you for the bracket.



by:
2020 Jeep Wrangler

Plug keeps getting loose on unit. I drilled a hole in the case and installed a tie wrap attaching wire to case no more movement of plug works great otherwise



by:

Well got it installed. Not to bad. Appears to work . Planning a trip in 2 weeks. Will post update

Charles

5/11/2024

Works Great, easy install, recommended



by:

I ordered the brake buddy yesterday and paid for overnight shipment. The confirmation indicated I would receive it today by 8pm. To my surprise I woke up and discovered it on my front porch this morning. Amazing service



by:
2016 Ford Transit T350

On our first trip, still 2000 miles plus from going back home, and a short is developed in the cord end plugging into the unit. The video won’t upload; but as it’s bleeding the brakes the motion causes the unit to short out and turn off. Hardly safe.

Etrailer Expert

Jenny N.

4/10/2024

Yikes! I reached out to Hopkins directly and they have a suggestion about it. Sometimes with this unit the male prong on the 4 flat connector that plugs into the unit will get bent inwards. When looking down on the prong you can see that it is split into 4 pieces. If the four pieces get bent together inwards then it will not make a good connection with the metal ground when plugged in. You can take a flat head screw driver and spread the pieces apart to fix it. Let me know if that works for you.



by:

have trouble with the brake paddle attachment locking onto the brake. setting the brake buddy adjustment take a while to adjust.



by:
Jeep Liberty

I have had the brake buddy system 3 for a year and it's a great braking system, I have no problems and its works great with my jeep liberty.



by:

Overall good performance so far with the Brake Buddy. The only issue that we had was the cable connected to the unit would come loose during operation and send a “check Brake Buddy” error on our remote. We were able to easily remedy this by using a screwdriver to spread out the connection terminal to make it tighter as per customer service instructions.
Customer service is great & very helpful!



by:

Nice unit, does what it is supposed to do and will noticeably slow my towed vehicle. It is a little cumbersome, but I set everything up in 8 or so minutes. Downside is that after one month long trip it would lose power after hitting a bump. Customer service was great and I eventually sent it back for repairs. They replaced a few things and has worked well until very recently. It appears that the plug will lose contact for a second over a bump and then the unit goes into a standby mode. The remote will let me know and I have to pull over and rebleed the unit. Some dielectric grease seems to have solved the problem



by:
2020 Jeep Wrangler

If you’re installing in a 2 door Jeep this brake buddy will install much easier if you 1. Remove floor mat 2. Set the driver seat all the way back towards the rear and 3. Lower the driver seat all the way down. By doing this the brake buddy will fit properly and allow for installing the cotter pin into the cleaver.



by:

Wiring is very sensitive, have to secure wiring in vehicle with zip ties so it doesn't come undone. Other than that it stops when it needs to



by:
2005 Jeep Wrangler

The parts worked well with my application. 2005 Jeep Wrangler Rubicon (TJ)



by:
2012 Chevrolet Volt

Looking good so far. The only comment I can think of is a question as to why the wiring is different then standard 12 volt wiring. For example, ground in normal 12 volt is the black wire. Hot is the red. etc. The brake buddy doesn't follow that standard.



by:

WE had issues with the unit losing connection. This was corrected with a new cable. The unit does loose air pressure if it sits overnight. Other then that the unit works as expected.



by:
2014 Jeep Wrangler

This was super easy to install in my Jeep. The install video for the Wrangler was spot an very helpful. I installed a permanent brake system in another car before doing this one and I am so pleased with the install.

Now I am off to test it out.

Trevor B.

6/8/2023

Ive been using this for a year now and have set it up a couple dozen times or more. This was so much easier than an installed brakes system. The only issue that weve had with it has to do with the power cable that connects to the 4 pin connector inside the vehicle. After some time the connector gets loose enough to fall out which requires is to pull over and reset the system. From Brake Buddy the fix is to look at the pins on the cable and where the tips of the pins almost look like you could a screwdriver, use a pocket knife or something thin enough to fit into the slots and gently spread them apart. I definitely recommend this device for a good, simple brake system.

Etrailer Expert

Mike L.

7/6/2023

@TrevorB They gave you great advice, that's exactly what we recommend to folks that have the same problem with their # HM39524 Hopkins Brake Buddy.

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274
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  • Parts Needed To Flat Tow A 2019 Chev Equinox 2.0L AWD
    You're correct that the Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar w/ LED Lights # RM-677 is for Blue Ox baseplates and would not be a compatible fit for the Roadmaster Direct-Connect Base Plate Kit # RM-523193-5. You'll instead need the # RM-676 Nighthawk, which is compatible with Roadmaster Direct-Connect style baseplates. The Nighthawk comes with the 6-way to 7-way cable and the socket but you'll still need the diodes and wiring to transfer your motorhome's signals through...
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  • How To Order Replacement Arms For The Roadmaster Base Plate # RM-521452-5
    To purchase just the arms for your # RM-521452-5 you will need to fill out the attached "Installation Details" form from # RM-ARMS and send it in to Roadmaster to purchase the exact arms for this base plate. To flat tow your 2019 Jeep Cherokee Latitude Plus 4x4 with Active Drive II you'll also need a tow bar that's compatible with your direct-connect arms (once you get them), a tow bar wiring kit, braking system, and safety cables. If you haven't gotten these items yet then I have the...
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  • Recommended Flat Towing Equipment For A 2015 Jeep Wrangler JK Sport
    Thank you for the pictures you sent. The Roadmaster Sterling All Terrain, Non-Binding Tow Bar # RM-576 has direct-connect attachment points so you'll want to use a Roadmaster direct-connect style base plate to attach to without the need of an adapter. For this I recommend the Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-521448-5. In your picture your tow bar has a crossbar # RM-067 attached as well as the arms from another base plate. You'll need to remove the crossbar...
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  • Recommended Roadmaster Base Plates For Flat Towing A 2007 Jeep Wrangler
    If you already have a Roadmaster tow bar for your 2007 Jeep Wrangler then you'll want to get Roadmaster base plates as well to avoid having to purchase adapters. For a standard factory bumper you'll want the Roadmaster Direct-Connect Base Plate Kit # 1429-3. These direct connect style base plates will offer you a quick and easy attachment point for your tow bar. To flat tow your 2007 Jeep Wrangler you'll also need a tow bar wiring kit, braking system, and safety cables. If you haven't...
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  • How To Install Break Away For Brake Buddy Braking System
    The Replacement Breakaway System for Brake Buddy Classic and Select Supplemental Braking Systems part # HM39340 replaces the brake away switch for the brake buddy Classic II, Select II, Classic 3 (# HM39494), and Select 3 (# HM39524). We have not yet installed the breakaway switch from this setup yet to have a video to for assistance but I have attached the installation instructions for installing the break-away with the Brake Buddy system.
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  • Recommended Flat Towing Equipment For A 2016 Ford F-250 Super Duty
    To flat tow your 2016 Ford F-250 Super Duty you'll need a tow bar, base plate, tow bar wiring kit, braking system, and safety cables. I have the following recommendations for you listed below: Tow Bar: Roadmaster BlackHawk 2 All Terrain, Non-Binding Tow Bar # RM-422. This tow bar has a 10k rating to allow you safely tow your F-250 while also hauling some cargo in it (you'll need to verify the towing capacity of your motorhome and ensure you stay under that capacity). This tow bar has a...
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  • Confirming Flat Tow Components for 2019 Ford F-150 4x4
    You have done your homework for your 2019 Ford F-150 4x4. You can use either the Roadmaster EZ5 # RM-524431-5 base plates or the EZ4 # RM-524431-4. The difference is the EZ5 directly connect to the tow bar and the EZ4 will use a crossbar for connection. So specifically with the Nighthawk tow bar # RM-676, I recommend the EZ5 # RM-524431-5 because the crossbar doesn't come with that tow bar. This tow bar also comes with the umbilical cord and safety cables, so you won't need to get those...
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  • Can a 2018 Ford Explorer FWD with 3.5L Duratec Be Flat-Towed
    The 2018 Ford Explorer FWD with 3.5L Duratec can be flat-towed with all four wheels down per the owner's manual. In order to do so you'd need a list of components, of which I have attached below. Roadmaster Direct-Connect Base Plate Kit part # RM-524446-5 (No Active Air Shutters) Roadmaster Direct-Connect Base Plate Kit part # RM-524453-5 (With Active Air Shutters) Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar part # RM-676 Roadmaster Universal Hy-Power Diode Wiring Kit part #...
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