The rear brakes will adjust or tighten as the brake pad wear. When you drive the car in reverse this is when the brakes adjust. As suggested in the prior post, inspect the rear brakes. Pay attention to a wheel device that has ratchet. I suspect someone did a brake job and put the adjustor on backwards.
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if the wheel cyclinder is bad it will either bleed off causing the brakes to feel soft or the pins could be stuck causing them to drag. also check that all the springs were replaced in the proper location or it may not be holding the adjuster where it needs to be.
Your rear brakes need to be addressed, it could be proportionate valve at your master cylinder or your brake shoe are in to tight from a missed adjusted parking brake cable.
Good luck and hope it's a simple parking brake cable adjustment or brake shoe replacement. Note that a worn out brake shoe will cause this also and you may have to replace the brake drums if it's also past it's wear marks.
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1. the brakes on the rear wore out or out of ajustment.
2. the cable is streched out and or needs to be adjusted.
3. the inner cable is broke.
4. autoadjusters jammed and not working or your not stepping on the brake and backing up to adjust the brakes.
if you have abs the electic noise you hear is most likely coming from the abs modulator. as for the rear brakes intermittently locking up, the most common problem is overadjusted rear brake shoes, under adjusted rear brake shoes, or excessive brake dust inside the drums.
Underneath your vehicle, a steel threaded cable comes from the back of one hub and is joined by a short cable from the other hub--then the original cable runs to a threaded end with an adjuster nut in it--and one smaller nut on the end outside of that--(this is the equalizer bar)--you'll see it real close to your transmission. You might have to jack-up the back of the vehicle??? Pull the parking brake lever up sharply and then release it. Pull the parking brake lever to the second click and leave it there. You're looking for a slight drag of the brake shoes when you spin the wheels. To increase the drag, get under at the equalizer bar and turn the adjusting nut to take up the slack in the cables. Get out and spin the rear wheels if you think it's to tight. I will say don't be afraid to crank on it for a while as in this case, a little adjustment really does not go a long way. When you think you have the drag right, go back in the car and pull the brake up the the fourth click. At this point the wheels should be locked and you should not be able to turn them even when trying hard. If you can, tighten them up a little more. Once you've done this, release the brake and make sure the wheels spin freely. If they are still binding due to the parking brake, back off the adjustment a little. And that's basically the whole adjustment procedure.
I don't know if this works on a Buick but I have had two cars that the auto adjusters worked when you used the parking brake, I rarely use the parking brake so I got in the habit of working the parking brake 20 times or so at oil change time.
The rear drum style brakes can be adjusted by removing the rubber plug on the back of the plate, and using a brake tool or flathead you can turn the "star wheel" adjuster to move the shoes closer or further from the drum.