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Thread: Defender Brake Problem

  1. 12th October 2011, 10:49 PM #21
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    isuzu110
    isuzu110 is offline Master Supporter
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    "the vac pump should suck at least 15 to 18 in/hg at idle speed" - JustinC

    http://www.aulro.com/afvb/1343562-post2.html
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  2. 13th October 2011, 07:18 AM #22
    GyroLandy
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    Thx, I have read just about every post on vacuum pumps but didn't find this one.

    My vaccum pump reads between 15 and 20hg but the needle on the gauge goes up an down (shudders) between these two readings. Is that ok or must it remain constant on on reading?
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  3. 13th October 2011, 08:58 AM #23
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    Quote Originally Posted by GyroLandy View Post
    Thx, I have read just about every post on vacuum pumps but didn't find this one.

    My vaccum pump reads between 15 and 20hg but the needle on the gauge goes up an down (shudders) between these two readings. Is that ok or must it remain constant on on reading?
    AFAIK it's a piston style pump not rotary vane. (never had one apart)

    If so, you'll get some pulsing.
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  4. 13th October 2011, 09:11 PM #24
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    Bushie
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    Quote Originally Posted by GyroLandy View Post
    Thx for the offer, I bought one today. Does anyone know what the readings should be and how it is measured i.e. at idling speed or high revs?
    Quote Originally Posted by isuzu110 View Post
    Search is your friend....

    "the vac pump should suck at least 15 to 18 in/hg at idle speed" - JustinC

    http://www.aulro.com/afvb/1343562-post2.html

    Or we could have gone back to post 8 in this thread !!

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