1994 GMC SONOMA FLUID BYPASS

  • Tiny
  • john singleton
  • 1994 GMC Sonoma

Brakes problem
1994 GMC Sonoma 6 cyl Two Wheel Drive Manual 250000 miles

have abs on this vehicle have replaced master cylinder no leaking anywhere. When the brake pedal is pushed down there is a hissing sound like the fluid is bypassing or not enough force to completely compress the master cylinder piston. I am not familiar with how the abs module works. Could something be stuck in the abs module or do I have a booster problem?

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Thursday, August 12th, 2010 AT 7:16 AM

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  • Tiny
  • bluelightnin6
  • Expert
  • 17,062 posts

If certain none of the lines are leaking than check for vacuum leak near the brake booster.

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Thursday, September 30th, 2010 AT 3:54 PM

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