94 gran prix

You would have to check over the car, and look for a leak, or a broken line. Or, take it to a shop you trust. Brakes aren't something to fool around with, so if you don't know, you should take it to a pro.

thanks 80 knight. found the leak right around the rear tires. wow its was really pouring out. thanks for reply.

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No problem. Good luck with the repair. :)

Considering the location, it's likely the wheel cylinders. Once you've got dead wheel cylinders, the brake shoes will also have to be replaced, no matter how much material is remaining (because the brake fluid soaks into them and ruins their ability to exert any braking). Also, on an old car, once you start to remove the old wheel cylinders, it's likely the brake lines going into them will snap (rust & rot).

If you've got a shop you trust (and you wouldn't want your brakes worked on by one you don't), have them look over all the other brake lines while they're working on the car. If the rear brakes are so badly shot, it's possible that other brake lines could be very close to going south. (Brake lines die both from external rust & rot (what with running along the bottom of the car and being exposed to water, road salt, etc.) and internal rot (since brake fluid is hygroscopic and, over time, can absorb enough water to rot internal brake components). Oh, and not just the metal lines -- The flexible brake lines should be checked for cracking and other age-related decay of the rubber...

If they fix only the rear brakes, have them drain the *entire* brake system and put all new fluid in. The old fluid has likely absorbed enough moisture over time that you don't want to give any other brake component any excuse for ruining your day...

As far as I know, all Grand Prix's from around '90 and up have rotors and calipers on the back and the front. As for your other tips, I would agree. All brake lines should be checked, and replaced if necessary.