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Old 04-02-2012, 09:37 PM
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Brake vacuum booster ?

Pardon my lack of remembering, but it's probably been a good twenty years or so since I last worked on brakes to speak of. I took a basic GM disc/drum master cylinder w/boost off of my 33 Plymouth's firewall. I bought a nice new chrome 7" booster & disc/disc master cyl. ( The car has disc front / disc rear). I take the new pieces out of the boxes & find there are no instructions! I can get them all mounted up together, but my question is this: shouldn't the plunger in the booster stroke more than just about a half inch! I bench bled the master and it in strokes fine, so I checked the booster before I mate them and it only strokes maybe 1/2 inch! I looked into the outside of the booster & it has a star type lock ring in the end about 1/2" in. Is that just for shipping and keeping the diaphram, etc. in place until ready? I realize that vacuum helps to assist with the pedal pressure when applied, but shouldn't the booster be able to stroke as far as the master? Bob

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Old 04-14-2012, 07:45 PM's Avatar Moderator
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Needs the vacuum to work. Ever try to stroke a brake pedal w/ engjne off? Gotta have vacuum.
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