Brake Booster - vacuum

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  • Cyrix2k
    E30 Addict
    • Mar 2010
    • 593
    #1

    Brake Booster - vacuum

    How much vacuum should the brake booster pull? I'm busy tracing down what could cause a rough idle on my m50 swap and it ran a lot smoother when I pulled the brake booster vacuum line off the manifold & plugged it temporarily. How would I verify proper operation of the booster? I don't hear hissing.

    Thanks!
    1997 540i/6 - stock
    1985 325 - M50NV - Getrag 250 - 2.79 LSD - MS2/e -LC-1 - 750cc injectors - Blunttech Manifold - HX35 - AEM UEGO
    1991 318i - M50NV - Getrag 240 - 4.10 open - e36 rack - Smileys - 55w 5000k HIDs
    Tags: None
    • FLG
      No R3VLimiter
      • Sep 2011
      • 3165
      #2
      Hook up a vac tester to the booster and see if it holds. If it doesn't either the hose going to it is ripped somewhere or the diaphragm in the booster is bad.

      Sent from my Galaxy Nexus using Tapatalk 2
      -Build http://www.r3vlimited.com/board/showthread.php?t=295277

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