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Brake booster causing idle surge: need replacement (OEM, used, aftermarket?) 200 1993

posted by  crazy driving on  Wed Jan 14 03:06 CST 2009
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last visit: Fri Aug 15 05:22 CST 2014
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After much testing, I've come to the conclusion that the brake booster on my '93 244 is bad. It is causing an idle surge during the warm-up process, usually only on cold mornings. One can tell it's tied in or due to the brakes somehow.

Have any of you had this happen?

What suggestions do you have on a replacement?

Thanks,
--
crazy driving: Cincinnati, OH, 1993 244 Limited Ed. 'Classic' model (daily driver). 75,xxx miles. Mods: 'European' Cibie headlights, ipd sway bars, strut-to-firewall braces, Bosch (amber) fog lights, 80mm tach/52mm clock.








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    Brake booster causing idle surge: need replacement (OEM, used, aftermarket?) 200 1993

    posted by  someone claiming to be augie on  Wed Jan 14 11:18 CST 2009 [RELATED]

    I'm not sure how you can be certain it is the brake booster, but here is a different reason why a car will idle poor when cold but smoother on warm up - the injector o-rings are worn. they shrink when they get old but expand a little as the engine heats up. try spraying a water mist at the injector base while cold - if the idle smooths out momentarily, that's your problem. Post back how you eventually fix.
    Augie








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    Brake booster causing idle surge: need replacement (OEM, used, aftermarket?) 200 1993

    posted by  mountainman on  Wed Jan 14 05:07 CST 2009
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    last visit: Fri Aug 13 05:13 CST 2010
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    Looks like a cheap fix:
    http://www.ipdusa.com/Volvo-940960/Brakes/Brake-Booster-Check-Valve/p-136-268-1494/







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    Brake booster causing idle surge: need replacement (OEM, used, aftermarket?) 200 1993

    posted by  AMSroadrunner on  Wed Jan 14 04:36 CST 2009
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    last visit: Mon Aug 25 16:43 CST 2014
    [RELATED]

    That was an ASE question that had everyone stumped! Short answer: it is the check valve for the brake booster.

    Andrew







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