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Old 07-02-2011, 01:53 AM   #15
MusicMan70
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Join Date: Feb 2011
Location: Corona, CA
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Re: Power brake push rod adjustment

You did mention you had a lumpy cam and that you went to a smaller booster(11 to 8). As stated previously by Murph; you need at least 18 inches of vacuum for the booster to work properly. Is the 8 inch booster a dual diaphram type?
I did an upgrade on a 61 GMC V-6. It too did not stop as well as I thought it should. I had more than enough vacuum, or so I thought but...I added a vacuum reservoir and vacuum pump to boost it anyways. Still wasn't happy with it.
I changed out my dual diaphram S-10 booster, for a power drum brake unit from a 1970 GMC; master cylinder and Booster. Turns out, I may not have Bench bled the first master cylinder properly because that pedal feels 100% better. My two cents....
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