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My 65 Mustang just got a new master cylinder and booster installled. However, as soon as you start driving the brakes seize and get really hot. Makes car impossible to drive. Also the brake lights come on and stay on whenever this happens.
 

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I will assume that this problem was not present prior to replacing the master cylinder and the booster. If this is a new problem then it would seem reasonable that the problem lies with one or both of those new components. There should be a rod from the inside peddle to the booster. There may also be another rod coming out of the booster to the master cylinder.

The problem that you have sounds like the master cylinder is not retracting enough to allow the brake fluid to return to the reservoir. This could be caused by one or both of those two rods being too long or the peddle is not returning as far as it should. If either of the rods have an adjustment, try to shorten them. Also, compare the new rods with the old ones to see if they are the same length.

Art.
 

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Tow it back to the shop who "fixed" it and tell them to fix it right this time.
 
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