Requires excessive force brake pedal to stop vehicle

1994 TOYOTA 4RUNNER
195,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MAURA
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  • 1 POST
brakes fail , replace master cylinder,blead brakes, and master cylinder. Still have no brakes. requires excessive force brake pedal to stop vehicle. No leaks.
Sep 6, 2008 at 2:44 AM
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MERLIN2021
  • CERTIFIED EXPERT
  • 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!
Apr 12, 2021 at 10:03 AM