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  1. Trailer Brake Controller
  2. Hayes
  3. Electric
  4. Time Delayed Controller
  5. Up to 2 Axles
  6. Indicator Lights
Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed

Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed

Item # HA81725
Our Price: $46.61
You Save: 23%
Trailer Brake Controller
Shipping Weight: 0.7 lbs
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This time-delayed brake controller has a straightforward design that makes it easy to use. Includes an LED indicator and manual override. Activates brakes with a preset intensity. Great Prices for the best trailer brake controller from Hayes. Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed part number HA81725 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (57)
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Hayes Trailer Brake Controller - HA81725

  • Electric
  • Time Delayed Controller
  • Up to 2 Axles
  • Hayes
  • Indicator Lights
  • Under-Dash Box
  • Dash Mount
  • Automatic Leveling
  • Up to 360 Degrees

This time-delayed brake controller has a straightforward design that makes it easy to use. Includes an LED indicator and manual override. Activates brakes with a preset intensity.


  • Brake controller activates trailer brakes with preset intensity
  • Adjustable power output lets you select the amount of braking force
    • Thumbwheel located on front of module for easy access
  • Red LED indicator on front of unit illuminates when trailer's brakes are applied
    • Light glows brighter as power output increases
  • Slide-bar manual override is within easy reach for controlling trailer sway or stopping in emergencies
  • Built-in safeguards protect your vehicle and your trailer
    • Current limiter protects vehicle from shorts in the trailer wiring
    • Hazard flasher immunity prevents pulsing of the brakes when flashers are activated
  • Dependable solid-state construction
  • Quick and easy installation with no mounting restrictions
    • No need to mount level - install anywhere at any angle
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) available for select vehicles to reduce installation time
  • Made in the USA


  • Application: trailers with up to 2 axles (4 brake assemblies)
    • Compatible with electric brakes only
  • Dimensions: 5-1/4" long x 3-1/8" wide x 1-1/4" tall
  • 3-Year limited warranty

Built-In Controls on the Syncronizer

Syncronizer Controls

Power Output Control

Braking output is the maximum amount of power that will be applied to your trailer's brakes. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to set the braking output as high as you can without locking up the brakes. Once you've set up the brake controller the first time, you shouldn't need to adjust the settings until the trailer load changes, you switch trailers, or road conditions change. Use the thumbwheel on the left of the module to change your settings.

Red Indicator Light

The red LED indicator light illuminates when the trailer brakes are applied. This light glows brighter as the power output to the trailer brakes increases.

Slide-Bar Manual Override

The Hayes Syncronizer keeps the manual override within easy reach on the front of the module, great for stopping sway or controlling your trailer's momentum in emergencies. Push the slide-bar lever to activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.

Hayes Syncronizer review

Quick, Simple Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle. Your mounting options are limitless, so long as you can still easily access the controller and manual override.

If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.

Installation Accessories

See also's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.

Note: If a custom brake control wiring adapter is not available for your vehicle, a 20-amp circuit breaker (sold separately) may be required for installation.

Time-Delayed Braking

What is time-delayed braking

The Hayes Syncronizer comes equipped with time-delayed braking. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Syncronizer. The controller then sends power out to your trailer brakes to activate them with an intensity set by you, at a rate determined by you. The amount of braking power (output) can be adjusted to suit your preference, the road conditions, the type of trailer, and the weight of your load. To determine which levels are best for your application, test your towing setup and choose what feels right.

81725 Hayes Synchronizer Electric Brake Controller - Time Based

Installation Details HA81725 Installation instructionsAlternate Instructions HA81725 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Hayes Syncronizer Trailer Brake Controller - 1 to 2 Axles - Time Delayed - HA81725

Average Customer Rating:  4.8 out of 5 stars   (57 Customer Reviews)

This time-delayed brake controller has a straightforward design that makes it easy to use. Includes an LED indicator and manual override. Activates brakes with a preset intensity.


Super easy to install and the additional information they provided for my specific vehicle made it possible for me to have every piece necessary for a seamless installation.


Splicing the wires was no problem. Instructions were good. The only recommendation that I will give is that you trash all screws with flat screw driver heads. I also opted for bolts, nuts & washers for attaching the bracket.


I think it will be a good brake controller, I have not had a time delayed on before.


Installation was simple and straightforward. Took less than 30 minutes from start to finish.


Looks good!


Fit perfectly. Followed instructions and it works as it should. Great product at a great price.


Original supplied item was defective, however Hayes customer service immediately sent another unit and it works great. With the addition of a small removable slip in bracket for the console of my 2012 GMC 1500 Crew Cab and the wiring adapter, I can simply plug and play when I need the controller as opposed to a permanent installation that I have in my other pickup.


Works well. I like the delayed brake activation, it seems to be a smoother transition. The custom harness makes installing this controller easy and FAST. Love buying Made in the USA products and has a lot of them.


easy to install. Brakes tested good to trailer. I used self taping screws to mount brackets, rather than the bolts and nuts that it came with.It was to difficult to get my hands in position to use bolts and nuts (no big deal).


deliverd on time. and plugged right in thanks


Installed in 10mins in 2018 ram 1500 ecodiesel, have not used with trailer yet. Seems good for price, mounting bracket could be made a little better. Good service from e trailer


This is the 2nd one of these I’ve bought. I like the time delay application to the brakes. Always will try to buy products made in the USA. The price went up since I bought this same controller 1 1/2 years ago.


Good controller at a good price. Works as expected. Fast shipping at standard rate. This controller was installed in an 08
Sprinter camper with the help of the on line video from etrailer.


Installed in 10 minutes. Works excellent and combined with the wiring adapter was a simple plug and play.


The trailer seems to be holding up just fine. It was a good investment for my small business and I'm thinking about buying another from you.


Was easy to install and adjust. Works great applying breaks to my single axle dump trailer.


super fast delviery great product pluged right in



Best controller out there


Easy to install, easy to use


Great service! Fast delivery! Would order from again!


First time user on eTrailer. Great website and easy to use. With my parts selected the site suggested the quick connect wire kit for my vehical. This made installation a breeze.


My Hayes Brake controller was as described, Easily wired,mounted reasonably price,


Worked fine, plug and play with adapter cord.


Plug and play need I say more?


Great product great company.



Sold that truck but the product was A+ easy install worked perfectly.


Ty for following up with your product that we purchased si far so good *

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