Hydraulic Trailer Brakes are Slow to Release

Question

Question:

having problem with slow brake release

asked by: Richard

0

Expert Reply:

For hydraulic brakes that are dragging or slow to release it could be a number of issues. If you have used the wrong type of fluid required by your brake set up, that could cause the problem. There may also be a foreign object in the master cylinder blocking the correct flow of fluid. For either of these you will need to drain the system, check for foreign objects and remove them, flush the system and refill/bleed the system using the correct brake fluid.

If your system has a parking brake check that it is functioning properly and can move freely.

If you have drum brakes, make sure they are properly adjusted. Also make sure you are using a drum actuator for drum brakes or a disc actuator for disc brakes.

If the system has a breakaway kit, make sure that there are no broken or corroded connections in the wiring and that the battery is fully charged and the pin in the switch is all the way in.

expert reply by: Michael H

0

Mehdi

3/27/2025

Hi Michael I have three axles trailer Kaufman working with brake actuator ( drum) hydraulic Brakes and release working with delay I changed all brakes mechanism for all 6 tires Two times flush the fluid ( DOT 3 ) checked connections and make sure there’s no leaking Checked battery voltage But still brakes are slow to brake and release

Jameson C.

3/27/2025

@Mehdi Hows the shock on the coupler? Sounds like it might be a bad shock or the mechanism isn't allowing the coupler to move like it needs to.

Mehdi D.

3/28/2025

@JamesonC I changed all my 6 tires brake mechanism Checked all lines Took out air from brake cylinder Checked battery voltage Checked emergency switch when I push brake pedal a bit ( it’s better to say touch brake pedal) brakes on trailer works very aggressively ( also with delay) Even when I put brake gain on my truck to 0.5 !! ( it’s adjustable from 0 to 10 ) And release with delay !!

Jameson C.

3/31/2025

@MehdiD Can you test for voltage on the output circuit that runs to the actuator to see if only .5 volts is making it to the actuator when you touch the brakes or if it's getting the fully 12 volts? Does the system by chance lock up brakes when you apply a blinker?

See All (6) Replies to Mehdi ∨

Answer 1

The Demco Hydraulic Trailer Brake Actuator part #DM72VR should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This newest updated it rated at 7K instead of 6K. This is a bolt on option that mounts on 3" centers.…

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Answer 2

Hey Jerry, thanks for reaching out! For your single-axle, 3,500-lb boat trailer, I recommend the 25-1/4" Double-Eye Leaf Spring #TX58RJ. This is one of the most common spring lengths for a 3,500-lb axle and looks like a good match for your…

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Answer 3

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 4

Because Buyer's Products considers the build sheets and CAD drawings to be proprietary information, they won't provide copies of that. This being said, I pulled one of the #3370091560 Buyers Products couplers from stock and and measured the…

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Answer 5

I was able to go out to the warehouse and measure the clamp-on mounting bracket for HydraStar EOH Actuators #HS304-7169. I made you a dimensional diagram to better see, but found that the mounting holes for the u-bolt are 13-1/8 inches by 3-5/8…

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Answer 6

The Kodiak Disc Brake Kit #K2HR10A11RERR is actually specifically designed to fit an AL-KO 10k #99 spindle, so this will be a perfect replacement. Though this does include the oil cap, it should be noted that it does not include the bearings or seal.…

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Answer 7

You will want to start by following the troubleshooting tips in the manual for the electric over hydraulic actuator, #K71-651. I have outlined them here for you: 1. Verify that the trailer and tow vehicle are wired according to the electrical…

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Answer 8

Here are the brake bleeding instructions directly from the manual for the Hydrastar Actuator #HBA16. This process needs to be followed to ensure you do not damage the actuator. BLEEDING AND ADJUSTING THE BRAKES 1. It typically is much easier to bleed…

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Answer 9

The Hydrastar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes #HS481-8067 is designed to be completely plug-and-play so the female end of the 7-way would need to connect to the 7-way cable that's already installed on the trailer…

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Answer 10

Hey Aaron, it sounds like you are looking for an awning rail, is that correct? For that we have the P and F awning rail part #PF88FR which is compatible with the Solera awnings.

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Hydraulic Trailer Brakes are Slow to Release

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