1954 Cadillac hydrovac trouble

[Randall koerner]

hello fellas this is my first post
I have a 1954 Cadillac that has the hydrovac brake booster
when I tried to bleed the brake system I am constantly getting air out of the hydraulic side of the vacuum booster can anyone tell me what is going on

[timer2]

Randall- It sounds like your vacume boost unit needs to be rebuilt. Mine did the same thing. Pull the vacume line to the intake off and see if any brake fluid runs out the hose- there should be no fluid at all. I bought a kit from Cadillac Parts Ltd. and rebuilt mine and it works perfectly. They're a little complicated but doable OR there are rebuilt boosters occasionally on E-Bay and elsewhere. There are diaphragms and small piston and cup units inside and a check valve at the bottom(to keep the fluid from being sucked into the engine) and any one of those can and will create your problem.   T. Irvin