1998 Chevy Tahoe master cylinder or brake censor

1998 CHEVROLET TAHOE
130,000 MILES • V8 • 4WD • AUTOMATIC
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SUNFAN2002
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  • 1 POST
I am having an issue with my brakes the brake pedal is stiff when applying pressure and when i press on the pedal i hear a hissing noise it sounds like air i think its master cylinder friends think its the brake sensor can you help us out with this thank you
Dec 20, 2009 at 8:31 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Sounds like the power brake booster is leaking ruptured diaphragm

To check the booster, pump the brake pedal with the engine off until you've bled off all the vacuum from the unit. Then hold the pedal down and start the engine. You should feel the pedal depress slightly as engine vacuum enters the booster and pulls on the diaphragm. No change? Then check the vacuum hose connection and engine vacuum. If okay, the problem is in the booster and the booster needs to be replaced.
Dec 20, 2009 at 12:47 PM
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