Question about 1993 Oldsmobile Cutlass Supreme

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I have a brake fluid leak. I dont know what the

I have a brake fluid leak. I dont know what the part is called where it is leaking but its behind the back wheel, behind the rotor at top centered between the shoes. what is this part called?

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If the leak is on the outside then it could be just a loose bleeder screw .or a damaged brake line ... if the fluid is coming from inside then thats called a wheel cylinder .. you can get a kit to overhaul that or you can just buy a rebuilt one .. you will have to bleed the brake lines after the repair .. so you would need a bleeder wrench and bleeder kit (hose and bottle) and the proper brake fluid ... this is one thing you want to repair quickly ... you could loose your rear brakes if that cylinder lets go and shoe brakes have a tendency to grab when they are contaminated with fluid .. .. on your car that is called a brake drum instead of a rotor .. rotors are for Disk brakes .. with shoe brakes its called a drum .. if you are not familiar with brake repair then its a good idea to take the car to a shop ... its likely they will want to replace the shoes at the same time and thats a good thing if you have over 60,000 miles on them .. ..

Posted on Oct 07, 2009

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The part is called the wheel cylinder. (Not to be confused with the master brake cylinder that is under the hood and provides the pressure for the brakes to operate.

On a 1993, I suspect you have drum brakes, so the part you are describing as a rotor, (and that looks, well, round like a rotor), is actually not called a rotor. That is reserved to describe the round heavy plate on the front wheels.

Newer cars actually would possible have disc brakes with rotors on the front and rear wheels.

More than likely, especially on a 1993 vehicle, the seals in the wheel cyclinder are shot. Not sure how hard it is to get replacement parts, but the same re-build kits would likely have been used on several years and models of GM cars from the early to mid-90s.

Posted on Oct 07, 2009

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