Holmes Posted December 30, 2003 Share Posted December 30, 2003 I noticed that my idle drops ever so slightly when at a stop when I apply brake. Raises when I let off on brake. Just wondering if this is normal. Quote Link to comment Share on other sites More sharing options...
TheSubaruJunkie Posted December 30, 2003 Share Posted December 30, 2003 Its done it on every subaru ive owned. -Brian Quote Link to comment Share on other sites More sharing options...
bushbasher Posted December 30, 2003 Share Posted December 30, 2003 the sube, honda, and the caravan all do it. It has to do with the vacuum boost on the brakes Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted December 30, 2003 Share Posted December 30, 2003 Your brake booster likely has a vacuum leak when you apply the brake. If it's not a large leak, everything will still work fine. A correct booster will cause a slight change in idle if you pump the brakes, but if you hold them in it shouldn't technically change the idle like your describing. I wouldn't worry about it unless it's severe. GD Quote Link to comment Share on other sites More sharing options...
Holmes Posted December 30, 2003 Author Share Posted December 30, 2003 Thanks for the replies. Quote Link to comment Share on other sites More sharing options...
myossfeece Posted December 30, 2003 Share Posted December 30, 2003 yeah it sounds like normal activity there. when you apply the brakes, the idle will drop slightly beacuse the vacuum booster kicks in and acts kinda like a slight vacuum leak. At least to the motor, because it's trying to replenish the vacuum lost from the booster on the brakes. my 2 sense n e way. I wouldn't lose any sleep over it. Quote Link to comment Share on other sites More sharing options...
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