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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Wed, Dec-18-2019, 11:23:28 PM   #1
Geoby0
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Default Rear Brakes Dragging

Hey all,

So the last time I drove my car I was hearing a metallic dragging sound at low speeds

Jacked it up and in the air and with the parking brake fully disengaged the rear brakes are sticking

When the wheels spin in first, the brake will catch and make the whole arm jumps from the contact- and I can audibly hear the brakes dragging when I put my ear near the caliper.

When I loosened both bleed screws the problem went away. Also- if I touch the brakes ever so slightly the noise and jumping go away too. I thought maybe a line is bad and has "delaminated and made a check valve" but I have SS lines- albeit almost 100k mi old.

Pads and rotors were done less than 1k miles ago.

I've done the Bentley tests for the master cylinder and brake booster- the brake stays firm when engine is on. The front wheels spin fine.

Next step for me is to undo the brakes and see if how well the piston is retracting. No lines were leaking/ kinked. I will not drive the car- for safety reasons and fear of damaging expensive new brakes.

If anyone has experience- let me know!

Thanks- Geoby

Last edited by Geoby0; Thu, Dec-19-2019 at 07:37:36 PM. Reason: Added Video
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Old Thu, Dec-19-2019, 07:52:10 PM   #2
Geoby0
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Default Rear Brakes Dragging

Update: Took off the rear calipers, cleaned and regreased everything. The issue persists- and still goes away with a touch of the brake pedal.



Things I noticed: A large groove in my left brake pad, uneven feeling rotors on both sides, a disintegrated dust seal on the right caliper- both pistons went in and out smoothly.



At this point I would assume the culprit is the pads and rotors, due to the unevenness and grooving in the pad. But before that I will fill the system with some new fluid and see if that improves anythingIMG_9865.jpg

Last edited by Geoby0; Thu, Dec-19-2019 at 08:06:34 PM.
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Old Sat, Jan-04-2020, 02:46:09 PM   #3
Geoby0
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Default Re: Rear Brakes Dragging

"The AST system improves traction by electronically apply-
ing the rear brakes when the rear drive wheels are spinning at

a faster rate than the front wheels. The combined ABS/AST
control module, operating through the ABS hydraulic control
unit, modulates braking force at the rear wheels."

Could this be the cause of my problem? The brake lockup does stop immediately after I disengage ASC.
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Old Sun, Jan-05-2020, 12:54:39 AM   #4
pbonsalb
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Default Re: Rear Brakes Dragging

Maybe you have a bad abs sensor or a rusted or gunked up abs cog. ASC uses them.
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Discussing Rear Brakes Dragging in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)