1986 GMC Suburban No power brakes

1986 GMC SUBURBAN
30,000 MILES • V8 • 4WD • AUTOMATIC
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LYNNPOM
  • MEMBER
  • 3 POSTS
when you depress the brake pedal it is very to push down, like there is no power brakes. There are not warning lights. Brakes themself are fine. Also when you pres on the brakes it makes a hissing noise like air is escaping
Jul 27, 2009 at 8:26 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
You have a faulty brake booster. The big can thing between master cylinder and firewall.
Jul 27, 2009 at 8:36 AM
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BUDDYCRAIGG
  • ✓Experienced Mechanic
  • 2,262 POSTS
oops, posted 1 minute too late.
Jul 27, 2009 at 8:37 AM
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