1994 Toyota 4Runner Vacuum issues

1994 TOYOTA 4RUNNER
112,000 MILES • 6 CYL • 4WD • AUTOMATIC
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RICHIE923
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  • 2 POSTS
Break pedal hard (no assist at all). Engine runs fine, there was an issue with vacuum leaks but i think I have it solved. There is now vacuum at the booster. How much vacuum should be present at idle? can the booster go bad from prolonged loss of vacuum to it? What should the vacuum system pressure be?
Mar 2, 2009 at 2:43 AM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Hi there,

Check that the vacuum check valve at the booster is not faulty, max idle vacuum is 21" mercury but often 18-19 is ok, i would be checking that there is vacuum at the check valve first.

mark (mhpautos)
Mar 2, 2009 at 2:49 AM
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RICHIE923
  • MEMBER
  • 2 POSTS
I didn't even think about that. Thank you very much. or as we say in Hawaii "Mahalo"
Mar 2, 2009 at 5:50 AM
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