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1994 Toyota 4Runner Vacuum issues

Tiny
RICHIE923
  • MEMBER
  • 1994 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 112,000 MILES
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?
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Monday, March 2nd, 2009 AT 2:43 AM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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)
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Monday, March 2nd, 2009 AT 2:49 AM
Tiny
RICHIE923
  • MEMBER
  • 2 POSTS
I didn't even think about that. Thank you very much. Or as we say in Hawaii "Mahalo"
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Monday, March 2nd, 2009 AT 5:50 AM

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