Originally Posted by
fasteddie
Nothing to bleeding the hydraboost unit , done many . You just run the engine at idle , make sure fluid is all the way up , work the pedal and steering ,if it has P.S. This will bleed air out of that system .To check the hydraboost unit , run the engine to pressurize the hydra , turn off engine , pump the pedal , usually 3 to 4 times , you will feel the pedal get hard [just like if you lost vacuum to standard P.B]. Sounds more like your problem is more towards master cylinder as you said . Small resevoir is for the rear shoes.Possible stuck porportioning valve ,maybe still some air stuck in system or weak master cylinder .Also make sure the rears are adjusted up .