Question about 1999 Oldsmobile Silhouette

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Spongy brakes the brake peddle on my olds is spongy when the engine is running. shut the engine off and it gets hard as a rock. new pads, rotors and bled the system. no change.

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I have had the parts stores give me the wrong pads for these before but also these have a little *** or bump on the back of the pad. this bump has to be in the right position or it can cause the caliper/piston not to seat properly. you may have to disassemble and look carefully for this problem. sometimes the caliper won't sit flat on the pad on the outside because of that little ***. also it can be under the piston. just get rid of the *** if you see it and reassemble. make sure you bleed from all the bleeders not at the closest line that comes free.

Posted on Aug 31, 2008

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Posted on Jan 02, 2017

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HAve you troublesot the ABS?

One thing it DOES sound like is the power brake booster. The vacuum size has a leak.

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