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vacuum booster question

Discussion in 'The Garage' started by big83chevy4x4, Jun 30, 2005.

  1. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    when i step on the brake, the idle goes up about 100 rpm, but then back down to normall after a few seconds, would this indicate a bad booster? i only noticed it a few weeks ago.
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    ttt, anyone?
     
  3. AZK5

    AZK5 1/2 ton status

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    Possibly, the booster leaking can be spiking the idle speed slightly. Pull the booster line off the manifold and hook a vacuum pump up to it. It should hold vacuum.
     

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