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

Posted by Peter Packard On 2007/9/20 2:41:40

Hi Brian and Keith, I'm pleased to see some good info flowing and it is all appreciated. I concur that the most likely culprit was excessive swelling of either the master cylinder primary cup or a faulty residual check valve. All that I know is that the "failure to release pressure" situation has not re-occurred since I conducted a crude blow -out and replacement of the dot 5 with a dot 4 "guaranteed no seal swell" brake fluid. I did replace the primary cup, residual check valve and compensator valve with NOS items when I put the replacement booster in. The NOS items were however 50 years old so they may have been very shelf life affected.
The 56 overhaul manual Section on Brakes has the heading ESAMATIC POWER BRAKES, so I guess the Bendix family name was TREADLE-VAC.
I am hoping that all goes well with my brake system and thanks for your input, which has increased my understanding of the system. Best regards Peter Toet