Re: BTV power piston help required.

Posted by Ross On 2010/5/5 22:17:38

The poppets are easily rebuilt by peeling off the old rubber and gluing on some new discs cut from sheet rubber. This will have a very good effect on the "feel" of the unit.

If your diaphragm is cut, then you will have to replace it--I bought one from Sandy Chirco (Tuscan Packard)last year. Otherwise just clean it up and "massage" the brake fluid out from between the two halves. There should be a small hole on the back of the metal center portion that will let it out. In fact, if that little hole is plugged the reaction diaphragm can't do its job and you will get a terrible harsh pedal.

Occasional bleeding and refilling is a good idea for any brake system running conventional fluid, especially in a moist climate. Done every two years it gives all the components a very long service life in my experience. Don't know where the 3-5 years life of the seals info came from. Just did it this morning on a 56 and a 52. Took about 45 minutes apiece.