View Full Version : '04 Trailer actuator spraying brake fluid...

07-06-2006, 05:36 PM
Hey all,
I had been noticing that my trailer actuator has had brake fluid leaking around the fill cap. The orange rubber gasket doesn't seem to want to seal. If you screw it on too tight it slips down around the threads and leaks. If you do it too loose, same result. Today was a new one tho. I noticed a fluid sprayed on the back bumper of our tow vehicle. It's brake fluid and I'm sure the cause is the actuator spraying the brake fluid. We have to back up a slight incline to our house. The solenoid locks out the rear brakes, but the actuator still compresses. I'm guessing this fluid has no where to go, so it blows past the fill cap. Anyone else experiencing this? Any suggestions other than having to manually lock this thing out?

Who is the manufacturer of these actuators? Was anyone else supplied with a manual like we were with our '02 MC trailer?


east tx skier
07-06-2006, 05:48 PM
I'm just spitballing, but my actuator is UFP. Don't know how much has changed in 11 years though.

/edit. Just looking at the online trailer manual and am not so sure that's a UFP actuator. Sorry. Confused yet?

07-06-2006, 05:58 PM
a little red-faced not seeing the trailer manual online. :o However, our '02 trailer came with a specific manual for the actuator. I think it was UFP then, but now... :confused:

The trailer fluid was just filled to rec. level, so I know it's not an overfill situation.

east tx skier
07-06-2006, 09:40 PM
Mine was leaking from beneath the actuator and it turned out that my master cylinder had gone to crud in the two years since I bought it. Fortunately, they're not too expensive.

07-07-2006, 03:04 PM
I got a better look at what's happening. There is a little 'breather' hole(?) in the side of the cap. It's about 1/16" diameter and that is where the brake fluid is leaking/spraying out.
I guess I'll run the fluid on the 'low side of full' until a fix is found. :rolleyes:

07-08-2006, 07:33 AM
Get a new cap. There is a diaphram in the cap that lets air out but keeps the fluid in. Most likely a hole in the diaphram.

07-08-2006, 10:01 AM
Thanks. I'll see if my dealer can send a new one to me.
Any ideas what can cause the diaphram to fail so quickly?