TT Brake Service

JBarca wrote:

alexey75 wrote:

JBarca wrote:



OK, I know the self adjusting trailer brakes.

1. Do you "only" feel the "jerking", whenever it happens, occur when you are applying the brakes and then "stops jerking" when you stop applying the brakes?

2. OR, does the jerking start when you have applied the brakes, and may continue for a short while even after you stop applying the brakes?

3. The key point it, the issue "starts" with a braking action, yes or no?

Please answer all 3.

John

John,

We bought this trailer about a year ago, and during the summer I've experienced it probably 5-6 times.

1. It happened when I have applied the brakes during the slow down, like before the traffic light. When the speed was around 10 mph I've felt the jerking for a second, just before it came to full stop.

2. No, it didn't happen when I applied the brakes. And it didn't continue when I stopped applying the brakes.

3. No, it doesn't start with the braking action.

I've mentioned before, I've read in truck's manual that the truck stop applying the TT brakes when the speed below 12 mph (or something like that).
Any chance it's related to truck and not trailer?

What year, make and model truck do you have? I looked and cannot find it in the thread or your profile.

Does the truck have an integrated brake controller or an aftermarket one? If aftermarket what make and model.

Not sure I ever heard of a brake controller that stops working on the way down in speed. But it maybe, not sure why though.

And yes, some integrated brake controllers do drop off current while the truck is standing still and you have your foot on the brake, but by then you are stopped and not moving.

Thanks

John

PS, this one is a bit of a mystery as it seems to point to only low speed, please confirm, it is only low speed coming to a stop. I'll hold off on speculation until we know more about the truck and brake controller. I have had trailer brakes do strange things that sort of lock up creating some of what you are describing , but not with this only low speed issue.