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Old 10-24-2005, 02:12 PM
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Master Cylinder Failure?

Other than the deployment of the air bag, how can I confirm the master cylinder in a 99 suburban is giving up the ghost?

Currently the fluid in rear reservior of the master cylinder is frothy with small air bubbles after I pump the pedal.

I have confirmed the rear wheel cylinders are not leaking and find no other obvious fluid discharge.

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Old 10-24-2005, 02:20 PM
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When you apply and hold pressure on the brake pedal does it stay there or does it gradually fall to the floor? If it falls to the floor the master cylinder is bypassing inside and needs to be replaced. If the pedal stays up with pressure applied it is good.
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Old 10-24-2005, 02:22 PM
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You can also pull the rubber boot off of the back of the master cylinder the one the push rod goes through and if it is wet inside with fluid your master cylinder is bad, if its dry its good.
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