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  1. Trailer Brake Controller
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  4. Electric over Hydraulic
  5. Proportional Controller
  6. Under-Dash Box
Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional

Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional

Item # HA100400C
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Retail:$410.02
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Trailer Brake Controller
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Product Expert Kathleen M

Is this right For you? Product Expert Kathleen M says:

Yes, if you:

  • Haul a fifth-wheel trailer with a semi or a similarly large truck equipped with air brakes
  • Would rather use your air brake system than run a ton of wiring in your truck
  • Often use hazard lights while towing

No, if you:

  • Don't want to mess with air fittings and needing extra parts to complete the install
This air-actuated brake controller senses the amount of pressure that you apply to your vehicle's air brakes and then smoothly applies your trailer brakes proportionately. Lowest Prices for the best trailer brake controller from Hayes. Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional part number HA100400C can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (48)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hayes Trailer Brake Controller - HA100400C

  • Air to Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Hayes
  • Under-Dash Box
  • Up to 4 Axles
  • Manual Leveling
  • Dash Mount
  • 360 Degrees
  • Indicator Lights

This air-actuated brake controller senses the amount of pressure that you apply to your vehicle's air brakes and then smoothly applies your trailer brakes proportionately.


Features:

  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Activates immediately - no pausing like with time-delayed brake controllers
  • Air-activated controller ties into your vehicle's air brakes to sense the amount of pressure that you apply to the brakes
    • Automatically adjusts trailer's braking based on how you depress the brake pedal in your tow vehicle
  • Rate of brake application can be increased or decreased by turning the controller handle
  • Red LED indicator on front of unit shows when trailer's brakes are applied
    • Light glows brighter as power output increases
  • Hazard flasher immunity prevents pulsing of the brakes when flashers are activated
  • Slide-bar manual override
  • Compact controller has black textured finish
  • Mounting bracket and hardware included
  • Made in the USA


Specs:

  • Application:
    • Tow vehicles with air brakes
    • Trailers with up to 4 axles (8 brake assemblies)
      • Designed for use with electric brakes or electric-over-hydraulic trailer brakes
  • Dimensions: 8-1/2" long x 3" wide x 1" tall
  • Air input port thread size: 1/8" NPT
  • 1-Year limited warranty




100400C Hayes Air Activated Electric Brake Controller - Proportional

Replaces 100400B

Installation Details HA100400C Installation instructions




Customer Reviews

Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional - HA100400C

Average Customer Rating:  4.8 out of 5 stars   (48 Customer Reviews)

This air-actuated brake controller senses the amount of pressure that you apply to your vehicle's air brakes and then smoothly applies your trailer brakes proportionately.

- HA100400C
by:

This is an excellent way to provide proportional brake energy to trailers with electric brakes. Well designed, reasonably priced.



- HA100400C
by:

etrailer is very reliable for getting the orders out in a timely manner. The website is very easy to navigate and there are always explanations about products so you can verify that you are getting the proper product for what you need.



- HA100400C
by:

Installed and tested but not yet used. The controller is of very high design and build quality. For the air connection, all I had to do was tee into the air line that goes to the brake light switch which already has a double check valve in place.



- HA100400C
by:

Needed a brake controller for my RV hauler conversion. Worked great and very easy to install. Received quickly and staff was very helpful!



- HA100400C
by:

Good product, works great.


Comments
Works great
Kevin - 03/06/2022


- HA100400C
by:

The controller worked ok for the three axle trailer but it would not lock the brakes even when the trailer was empty



- HA100400C
by:

Installed in 2002 Peterbilt 320 with air brake system, for use on electric over/hydraulic trailer brakes system. It works great!


Comments
Have found no issue, and recommend this product for air to electric or air to electric overhydraulic system. My power unit is heavy enough that I hardly need trailer brakes, I have them set to come on mildly on the trailer. This unit makes my tractortrailer unit legal for highway use.
Pate. - 02/18/2021

Comments
Have found no issue, and recommend this product for air to electric or air to electric overhydraulic system. My power unit is heavy enough that I hardly need trailer brakes, I have them set to come on mildly on the trailer. This unit makes my tractortrailer unit legal for highway use.
Pate. - 02/18/2021


- HA100400C
by:

Definitely a great product! Easy installation and great instructions! I use my semi to pull my camper occasionally and this box works great for the electric brakes on the camper from the air brakes on my truck.



- HA100400C
by:

Works as expected Gives excellent braking proportion from air to electric.


Comments
Works great ,, meets all expectations
Glen - 04/29/2021


- HA100400C
by:

Would buy from this vendor again



- HA100400C
by:

the information provided with the is stall is very veg they could have told you where to get a check valve they could have showed you in detail how and where to hook into the air valve , what lines to hook into , or offed a video on how to install for what it cost it is a rip off, you need to let hays know this for future sales


Comments
This is a pretty specialized piece of equipment whose install procedure will vary according to the vehicle it is installed in. At this time, we have not had the opportunity to install one, which is why we do not have a video to provide.
-- Etrailer Expert Mike L - 04/09/2019


- HA100400C
by:

I have not hooked up the unit yet. I have an overland osprey diesel pusher(dp). The coach has an exhaust brake. When the exhaust brake engages the brake lights automatically come on. Using a conventional electric brake controller like the Prodigy P2 would engage the trailer brakes when ever the exhaust brake engages, causing the trailer brakes to burn up on long down grades. I know this can be fixed by adding a diode in the wiring, but that involves tracing a lot of wires until I found the right one. this unit doesn't need to connect to the brake lights. it only needs the air pressure being applied to the brakes to engage the trailer brakes. It really is a sweet unit for a DP with air brakes.



- HA100400C
by:

Works great. Customer service was above and boyond helpful. 100% excellent. Thanks for a great product!!!!



- HA100400C
by:

Works great on my Peterbuilt 330 set up with a 12' flatbed with gooseneck and 2" receiver hitches. The electric trailer brakes actually work when you expect them to.



- HA100400C
by:

I have been very please with the Hayes Air Actuated Brake Controller, then one morning it wouldn't work. Tommie at etrailer was great helping me diagnose the problem and replaced the unit asap. Great service!



- HA100400C
by:

Purchased this for a Class 8 truck with air brakes. It was easy to mount and to install. Wiring it up was a snap, but I was surprised that I ordered 2 and did not receive instructions with either. Had to go online to get a schematic and operating/mounting instructions. Wasn't a big deal as etrailer had it on the product description, but if you're old school like me you expect to receive instructions with the product.



- HA100400C
by:

Hard to adjust and you can't test the trailer brakes with it. Never fells like the trailer is getting power to activate the trailer brakes even though there's 12 volts going to the brake wire



- HA100400C
by:

Totally bulletproof compared to wimpy electronic controller. Breeze to install. Easy to control. Fast order fulfilment. Good staff



- HA100400C
by:

Received controller in record time yesterday. It is going to be installed in my Peterbilt 379 soon. I can't atttest to it's quality as it hasn't been installed but overall it looks great!



- HA100400C
by:

Came very quickly!



- HA100400C
by:

The support from etrailer has been great. Following up on their products along with the resources they offer online has been excellent.



- HA100400C
by:

Works great brakes much more even the more you apply the paddle the more braking you get



- HA100400C
by:

Got it fast



- HA100400C
by:

Very happy with this brake controller.



- HA100400C
by:

E TRAILER WAS ON TOP OF MY ORDER FROM START TO FINISH WILL BE DOING BUSSINESS WITH THEM AGAIN


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Show More Reviews

Ask the Experts about this Hayes Trailer Brake Controller



  • Hayes Brake Controller part # HA100400C Gain Adjustment
    The Brake Controller part # HA100400C control handle can be used to adjust the rate of application of the trailer brakes. There is a knob on the side of the controller and rotating the knob the counter-clockwise will increase trailer brake sensitivity.
    view full answer...
  • Will Hayes Air Brake Controller Work on New Holland TD95D
    The Warner Air Utility Brake Controller part # HA100400C that you referenced is designed to allow vehicles with air brakes to control the brakes of a trailer that are electric. If that describes your setup then this will work well for you.
    view full answer...
  • Where Does Stoplight Circuit Get Sourced for Install of Hayes Brake Controller HA100400C
    Actually when you wire in the Hayes Brake Controller part # HA100400C you use the vehicle's wiring and not the trailer wiring. You would need to find a stop light circuit for the red wire of the controller. Typically this is found at the brake pedal switch or in some case the wiring to the third brake light is used. I attached a help article on brake controller installs for you to check out as well.
    view full answer...
  • Why Would Hayes Brake Controller # HA100400C Have Voltage on Output Circuit All the Time
    Sounds like the red wire of the # HA100400C is connected to a circuit that has 12 volts all the time. You need to make sure it is connected to a circuit that only sees voltage when the brakes are applied.
    view full answer...
  • Installation Of Hayes Air Actuated Trailer Brake Controller
    The Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional # HA100400C mounts to the inside of your 2007 Nemar Essex at the dash just like other electric brake controllers will. It needs to be installed on the inside of the vehicle for proper function. It has a slide bar override that needs to be within reach for emergency trailer braking. The wiring connects just the same as an electric brake controller. Blue is trailer brake output, red is stop light swith, white...
    view full answer...
  • Brake Controller in a Volvo 780 VNL Semi for Towing Trailer with Electric Brakes
    Since your Volvo 780 semi has air brakes the part # HA100400C that you referenced would work well as it is designed to tap into your air brake system and apply a proportional amount of braking power to your trailer's brakes as it senses coming through your air brake system. If you are looking for the best option this is what I would go with as it's going to give you a way to apply the same amount of pressure as your semi brakes are applying.
    view full answer...
  • Troubleshooting Install of Hayes Air Trailer Brake Controller that Caused Trailer Lights to Light Up
    It's possible the controller is faulty but what my first thought was is that there's a short on the wiring for the controller which is causing voltage to back feed on the red wire of the controller and light up your brake lights. Try connecting the controller again and make sure there isn't any exposed wire touching and if the problem persists then the controller is at fault but if you see the problem go away that would indicate you had a wiring short problem.
    view full answer...
  • Recommended Brake Controller for Tow Vehicle with Air Brakes
    For your 2015 F650 tow truck with air brakes, I recommend the Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional # HA100400C. This controller senses the amount of pressure applied to your brakes and then smoothly applies the trailer brakes in proportion. It has the slide bar manual override and will work on trailers with up to 8 brake assemblies. I've attached a review video and installation instructions to assist.
    view full answer...
  • Where Does Hayes Air Actuated Trailer Brake Controller # HA100400C Need to Mount
    You really need to have the Hayes Air Actuated Trailer Brake Controller # HA100400C mounted in a location that is close enough for the driver to reach out and grab the manual override lever if needed. I know it's tempting to mount it near where there's an air line but if that's at the back of the vehicle we can't recommend that. If your trailer ever starts swaying you can easily kill the sway by applying the manual override as it will pull the trailer back from the tow vehicle and stop the sway.
    view full answer...
  • Is Check Valve Needed When Installing Hayes Air Actuated Trailer Brake Controller
    Actually the Hayes brake controller part # HA100400C requires a 2 way check valve only if the vehicle has primary and secondary service lines. I attached a diagram that shows how the controller wires in as well as how a check valve would get used if needed.
    view full answer...
    Image 1 for
  • Does Hayes Air Actuated Trailer Brake Controller Require Check Valve
    You do need a check valve to install the Hayes part # HA100400C. If you have a setup that has a primary and secondary air system you'd install the check valve between them. On older vehicles with a single air brake system, the controller should be connected from the service line through a check valve to the controller
    view full answer...
  • Could Hayes Air Actuated Trailer Brake Controller # HA100400C Mount on Trailer
    It is possible to mount the Hayes Air Actuated Trailer Brake Controller # HA100400C on your trailer but you would have to run the wiring needed to the trailer as well. You'd have to have a dedicated brake circuit, 12 volt power, and ground to this controller as well as the flexible air line.
    view full answer...
  • Brake Controller Recommendation for a 2002 Peterbilt 379EXHD That Ties into Air Brakes
    For a brake controller designed to work in proportion with your air brakes on your 2002 Peterbilt 379EXHD that will activate the electric brakes of your trailer you would want the Hayes Air Actuated Brake Controller part # HA100400C that you already checked out. All of the other electric brake controllers we offer would work as well, but none of them tie into the air brake system like the Warner does. If you wanted to go this route the Prodigy P2 controller # 90195 that you referenced...
    view full answer...
  • Brake Controller Recommendation for a 2016 Fleetwood Expedition 38k RV
    You have a couple options. If you want a brake controller that taps into the air brakes of your RV to send a proportional amount of braking power to your trailer's electric brakes you would want the # HA100400C. Or if you didn't want to mess with tapping into the air brakes an easier install would be an electric brake controller. I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to...
    view full answer...
  • Can a RV with Air Brakes Have an Electric Brake Controller Installed
    That's actually what we recommend the most for people towing trailers with electric brakes that have tow vehicles with air brakes. Installing a P2 part # 90885 will allow you to totally bypass having to interface with the air system and will work very well. Hardwiring a brake controller isn't too difficult. It basically is just a matter of running a few wires. One to the positive post of the battery, one to the ground, one to the trailer connector, and then one to the stoplight circuit. I...
    view full answer...
  • Mounting Bracket Installation on Hayes Air Actuated Trailer Brake Controller # HA100400C
    The U-bracket included with the Hayes Air Actuated Trailer Brake Controller # HA100400C is intended to support the controller from below and attach to the bottom of the dash. It does NOT attach to the controller in the way that typical brake controllers like the Prodigy P2 # 90885 do. The installation process of the Hayes controller includes application of double-sided tape, which is then followed by the installation of the bracket. It may be necessary to slightly adjust the shape of...
    view full answer...
  • Brake Controller on Tow Vehicle with Air Brakes
    The Hayes Air Actuated Trailer Brake Controller # HA100400C is designed to be used with a tow vehicle that has air brakes. However, that doesn't make it your only option. Electric brake controllers tie into the stop light switch of the tow vehicle so it doesn't matter what type of brakes it has. For an electric brake controller I suggest the Prodigy P3 # 90195 because it's one of the most reliable and easy to use brake controllers on the market.
    view full answer...
  • Hayes Air Actuated Brake Controller or Tekonsha Prodigy P3 for Peterbilt Truck with Air Brakes
    For your Peterbilt 335 I definitely recommend going with the Tekonsha Prodigy P3 Trailer Brake Controller # 90195 over the Hayes # HA100400C because it's going to allow for a much easier install and is more economically priced. The P3 also offers a clearer LED display on the unit itself so it's more user-friendly during actual operation as well. For power the P3 will just get wired into the truck like the Hayes controller, tapping into 12V power and the brake light switch. The difference...
    view full answer...
  • 1999 Freightliner FLD120 Brake Controller Recommendation for Trailer with Brakes
    The Prodigy P3 part # 90195 would work great for your application as it can basically be wired to any vehicle that uses 12 volt power. Or for a controller that is designed specifically for your application we have the Hayes brake controller part # HA100400C which ties into the air system of your tractor and gives you a proportional brake signal for a trailer with electric brakes. The connector you have in your hand is a standard RV style 7-way which is very common on trailers with electric...
    view full answer...
    Image 1 for
  • 2001 International 9400 Electric Brake Controller Recommendation
    Best option would be a brake controller that is designed to for vehicles with air brakes to tow trailer with electric brakes like the Hayes Air Actuated Trailer Brake Controller # HA100400C. This ties into the air brake system of your International 9400 and interprets the air pressure into applying a proportional amount of trailer brakes.
    view full answer...
  • Trailer Brake Controller for Tow Vehicle With Air Brakes
    There is a brake controller that will work for your tow vehicle with air brakes, though not the Prodigy P2 # 90885. Instead, you need the Hayes Air Actuated Trailer Brake Controller - 1 to 4 Axles - Proportional # HA100400C because the unit is designed specifically to tie into air brakes to control the braking on your trailer. I've added a link to a video review for you to take a look at, as well as a link to the written manual I strongly recommend checking out.
    view full answer...
  • Recommended Brake Controller for Dump Truck with Air Brakes
    The Hayes Air Actuated Trailer Brake Controller part # HA100400C is an excellent brake controller option for a tow vehicle with air brakes towing a trailer with electric brakes. It can support trailers with up to four axles and it is made right here in the USA.
    view full answer...
  • Where Can Two-Way Check Valve be Found for Installing Hayes Air Actuated Trailer Brake Controller
    While we don't carry any two-way check valves for an air brake system that the Hayes Air Actuated Trailer Brake Controller # HA100400C would install on, I can say that two-way check valves are also known as double check valves and a quick browser search found that these are fairly easy to come by. I'm sure if you have a truck shop nearby that they would have just what you need as well. Just make sure that the check valve fits with your current air lines and that the tubing from the check...
    view full answer...
    Image 1 for Image 2 for
  • Recommended Trailer Brake Controller For Electric Trailer Brakes On a Motorhome With Air Brakes
    I recommend the Hayes Air Actuated Trailer Brake Controller # HA100400C for your 1990 Monaco Executive. This will use the air pressure that goes to the brakes on your Monaco to determine the correct braking force for your electric brakes on the trailer.
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Kathleen M
Updated by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Manda E
Updated by:
Manda E
Employee Laura H
Written by:
Laura H
Employee Cole B
Installed by:
Cole B

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