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Old 11-08-2011, 02:37 PM
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brake booster pin length question

What do I do if I suspect my booster pin length is does not match the depth of my master cylinder piston hole? My brakes are fine but the peddle moves about six inches... My brakes are adjusted tight, drums all way round, shoes drag a tad...

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Old 11-08-2011, 09:40 PM
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Add length to it until you feel comfortable with it and then get a proper sized pin to put in its place. The pin you use should be hardened and be of sufficient diameter so that it does not bend or flex under pressure. For TEST PURPOSE ONLY, you can us an old Chevy push rod and cut it down to test it.

Is there a difference in stroke, if the engine is running or not?
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Old 11-20-2011, 06:07 PM
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so easy when you know the trick!

I got help today from a GM tech. There is a threaded rod protruding from the vacuum booster toward the driver. It threads to a clevis which attaches to the peddle. I thought the threads were to allow adjustment of the clevis, but they also allow movement of the threaded rod out/in from/to the vacuum booster. The GM tech just loosened the clevis and then used pliers to turn the threaded rod toward the booster. This action has reduced the "play" in the peddle significantly! I'm soooooo happy!

I sure hope this helps some a you guys out there who had trouble with this situation and, like me, could not find the answer for like two years or more!

rwruther
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