Question about 1999 Saab 9-5

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Press brake peddle almost to the floor and it does not stop.The mechanic says it is the master cylinder. Possible or not likely?

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If the pedal has sunk further than usual or gradually sinks then usually a Master cylinder gone bad, but also can be a ruptured barke hose or line. It can also be leaking brake caliper or wheel cylinder (will show a fluid level loss in Master Cylinder)

Posted on Jun 24, 2009


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When i press on my brakes it feels like it's trying to build up pressure but the break peddle go's all the way to the floor theres no noise like there's a problem with the brakes but it just wont stop what...

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Brake pedal still goes to floor 2000 GMC Jimmy

It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
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With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

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