Trucks & Trailers - Something floating in my brake fluid

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Bob's Cay
03-03-2011, 11:21 AM
I do not use my trailer much but yesterday I did use it to move my boat. It seemed that the surge brake was cluncking alot so I stopped to check brake fluid. Fluid was a little down but I suspected that after almost 2.5 years without use. But in the fluid was a black thimble looking thing made of black rubber. It is a Titan actuator about 8 years old. The thimble looking thing seemed to fit perfectly into the bottom of the black plastic cylinder cap. I pushed it in the cap with the open end down.

Don't know if it was the top off of fluids or messing with the thimble but the surge actuator seemed to work much better afterwards.

What was it and did I put it back in properly?

03-04-2011, 04:56 AM
Sounds like that floater was part of the cylinder cap, which had fallen apart. I'd replace the cap.

I doubt that floater had anything to do with performance of your brakes. More likely, the noise was brake parts partially frozen in place by rust, breaking loose when you started moving the trailer after 2.5 years.

03-04-2011, 04:58 AM
As brakes wear, the pistons extend further, and the fluid moves from the reservoir to the piston. As the fluid drops, air enters the reservoir. This air is contaminated with water, which is absorbed by brake fluid.

The doohickie is intended to expand as the fluid level drops, and should be attached to the filler cap. It's just like on your car or truck.

Bob's Cay
03-04-2011, 11:53 AM
Thanks Guys.

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