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Re: My 52 GMC Build
there arent check valves in the ports of the hydro boost master cylinder outlets, and air rises, so pressing the brake under accumuator pressure forces the air back and forth until it bubbles out the reservior.
I didnt believe it either, I started with a slap empty system when I changed the rear axle in my 65 with a tahoe hydroboost setup, cracked the ports, dripped, tightened, started engine, stepped on the pedal a few times and had 4 wheel brakes clapping at me. the pedal kicked a few times at first, but after that was smooth as silk. YRMV, but I bet they dont.
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