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james bethune
james ... 4/29/2010
2001 BMW 740iL Base 8Cyl4.4L - Brakes
My brakes will just start draging and will stop the car is the problen my booster?
I can just drive along and the brakes will just start draging untill the car will not go foward anymore. I can crack a brake line on the power booster and you can hear the brakes release. I then drive the car a few days and it will do it again. I've disconnect all the electronics including the ABS system and it will still do it. I think it is my power brake booster, but before I spend $600.00 just for the part I want to know that this is the problem.
Thanks for your time.
Steve
2 Answers
  • HouseCallAuto
    HouseCallAuto 4/29/2010
    I'm more inclined to suspect the master cylinder. Try this though. Unbolt the master cylinder from the booster leaving the brake lines attached. Install a single steel flat washer under the master cylinder ear mounts and reattach it. See if this condition repeats itself. If there is too low a brake pedal after doing this just remove the washers. I have never heard of a booster on any car causing a brake drag, or at least I have never been in on one that the booster was the fix. If the washers fix it, pull the master back again and see if the pushrod in the booster is adjustable and try to shorten it keeping track of the turns so you can "undo".
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  • HouseCallAuto
    HouseCallAuto 4/29/2010
    Another thing to try is to disconnect vacuum from the booster just for road test purposes. It will be very difficult to stop but if the dragging stops it would give credibility to the bad brake booster Idea.
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