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Old 09-07-2010, 02:32 PM
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Brake Master Cylinder Swap

My truck, a Chevrolet 454SS 1990, has developed a brake fluid leak between the plastic reservoir and the metal body of the master cylinder (see link below for picture). My question, can this master cylinder be replaced with one from an older truck that has an all metal reservoir. Would the threads for the brake lines be different, etc? Would the internal bore size of the master cylinder matter? Sorry about the vagueness.

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Old 09-07-2010, 07:29 PM
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You can put an all metal one on. Not sure about the lines depends on what year and such that you use.You can change the tubing nuts and reflare the lines.My toughts are that if the seals for the reservoir are that bad the internal ones may not be much better. Those rubber seals come with a rebuilt master cylinder and that would fix your trouble.Otherwise you need to stick to the same mastercylinder size ( bore ) for the system to stay balnced as designed.
Personally if it were my truck ( sounds very nice) I would put a reman master on it and be done with it. Brakes are cheap and easy compared to bodywork and paint after a wreck.
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Old 09-07-2010, 07:36 PM
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Yeah, you are probably right. I just hate the idea of spending money on a master cylinder that, in time, will have the same issue.
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