December 30, 200322 yr 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.
December 30, 200322 yr the sube, honda, and the caravan all do it. It has to do with the vacuum boost on the brakes
December 30, 200322 yr 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
December 30, 200322 yr 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.
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now