revs up while braking

1976 BMW 2002
159,000 MILES • 2.0L • 4 CYL • 2WD • MANUAL
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RCCARPET
  • MEMBER
  • 2 POSTS
Revs up at stop while brake is engaged.
Nov 3, 2017 at 8:57 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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KHLOW2008
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 41,814 POSTS
This is a likely vacuum leakage problem.
Check for vacuum leakage at the brake booster and its hoses.
Nov 3, 2017 at 10:25 PM
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RCCARPET
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  • 2 POSTS
Thanks.
Nov 4, 2017 at 7:16 AM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Here is a test from a guide on the site that can help you see whats going on:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/engine-idles-too-high

Please let us know what happens.

Cheers, Ken
Nov 5, 2017 at 6:21 PM