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Old 10-17-2018, 02:46 PM
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I have a 1957 chevy belair with corv c-4 suspension I felt the brakes began to drag after they heated up I took it to a local shop they said master cylinder rod was out of adjustment now when I apply brakes slowly they travel to the floor before engaging a rapid stop has what seems to be excessive travel before they apply?

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Old 10-17-2018, 06:52 PM
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Think I'm going thru that same thing right now. The rod that the shop cited is most likely the one between the booster and master cylinder. You can look up the specs for the clearance but it should be ABOUT 1/16". If that rod is to long and compresses the primary piston by 1/16" you will not have rear brakes but if the rod clearance is to much the pedal will have excessive travel. This rod is not easy to adjust. There is a special tool to measure with but can be done with a set of calipers. To make it even more difficult the M/C must be separated from the booster to make the adjustment which may require taking the brake lines off the M/C. Real pain. Note that I'm talking about the rod between the M/C and the booster and not the rod from the pedal to the booster. If you have to much pedal play (over 1") before starting to feel resistance then take up the play with the pedal to booster rod.
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Old 10-19-2018, 08:49 AM
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So they were good before they heated up and we're soft after?

A pressure gauge is your friend. Can help find a minior leak in say a caliper seal allowing air in.
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