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Requires excessive force brake pedal to stop vehicle

Tiny
MAURA
  • MEMBER
  • 1994 TOYOTA 4RUNNER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
Brakes fail, replace master cylinder, blead brakes, and master cylinder. Still have no brakes. Requires excessive force brake pedal to stop vehicle. No leaks.
Saturday, September 6th, 2008 AT 2:44 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Excessive force = test vacuum booster and check valve. Shut off the truck, pump pedal until all air is bled out(if any) hold pedal dwn, start truck, pedal should sink a bit, if not booster or valve on the vacuum line is bad. Check the valve by sucking through both ends, air should pass in one direction only!
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Monday, April 12th, 2021 AT 10:03 AM

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