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

I spoke with my contact at HydraStar regarding the issue you're having with the EOH Actuator like #HBA-10 and he has not really heard of this happening before. What he recommends doing is bleeding the trailer brakes to ensure there isn't…

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Answer 2

Yes, the Retainer Clip #KOD24FR is updated. They have been heat treated to increase strength 50%.

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Answer 3

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 4

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

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Answer 7

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 8

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 9

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 10

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 11

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 12

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Hydraulic Trailer Brakes are Slow to Release

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