Re: CAUTION ON THE USE OF SILICONE BKAKE FLUID IN ESAMATIC BRAKE SYSTEMS

Posted by BH On 2007/9/19 19:27:34

Peter -

Swelling of the plunger seal sounds more plausible, in that it might prevent the compenstor port from opening. However, I believe that the primary purpose of that port is to replenish the hydraulic chamber due to loss of fluid, which can occur as the brake fluid will condense over time.

More likely, the plunger was not returning to the fully release position. Also, perhaps there was some swelling of the rubber cup used in the residual pressure check valve (in the outlet fitting) that had some negative effect.

All these rubber parts are available in an affordably-priced reproduction of the minor overhaul kit as supplied by Bendix, which is widely available from any part vendor that specializes in vehicles equipped with the TreadleVac system.