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Hayes Brake Controller - Time Delayed Controller - HA81725 Review

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Review of Hayes Brake Controller HA81725

Today we'll be reviewing part number HA81725. This is the Hayes Syncronizer Trailer Brake Controller for one to two Axles. It is a timed delayed break controller. This brake controller is going to activate your trailer brakes with preset intensity. Then a signal is sent to the trailer brakes when the tow vehicle's brakes are activated. It does have adjustable power output that lets you determine the amount of power sent to the trailer's brakes.

That way you can set it to a higher output when towing in hilly terrain or with a fully loaded trailer or you can back off the power output when you tow a lightweight or empty trailer. Here on the front, it does feature a red LED indicator that will illuminate when the trailer's brakes are applied. The light glows brighter as power output increases. The Hayes brake controller features a built-in safeguards that are going to protect your vehicle and your trailer. It has a manual override that illuminates the brake lights on tow vehicle and trailer. It also has a current illuminator that's going to protect the vehicle from shorts in the trailer wiring and it has the hazard flasher immunity to prevent the pulsing of your brakes when your flashers on your vehicle are activated. Here on the front, it features the easy to access slide-bar manual override.

It's made from a dependable solid-state construction. We also have a little wheel knob here, that way we can increase the gain. This is a quick and easy installation. This can be mounted at any angle, in any plane, and in any direction. Mounting bracket and the hardware are included.

You can see here on this side that we have numerous smaller holes, that way we can totally choose the mounting location that's going to best suit our application. Hayes also offers plug-in, vehicle-specific brake control adapters that are sold separately, those can be used for certain applications to help reduce the installation time. This is designed to be use trailers with up to two axles or four brake assemblies. This is designed to be used with the electric brakes only. The overall length is going to measure 5-1/4 of an inch. The width is going to measure 3-1/8 of an inch and the system is going to measure an 1-1/4 in height. That's going to do it for today's review of part number HA81725.

This is the Hayes Syncronizer Trailer Brake Controller. .

Ronald K.


where does this thing pick up its signal to apply brakes

Etrailer Expert

Rachael H.


Brake controllers are wired to the vehicle wiring harness either through an OEM port on the vehicle or using a custom wiring harness specifically for that vehicle, and those can be found in our fit guide. The when the brakes are pressed on the tow vehicle the signal is relayed to the brake controller to activate the brakes on the trailer. I have included a couple of our help articles about brake controllers, their installation, and the different kinds for your reference.

Info for this part was:

Employee Joshua S
Video by:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Ryan G
Test Fit:
Ryan G

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