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1995 Mercedes Benz SL500 Repair Question


Topics covered: Abs, Proportioning valve, Mechanic.
Mileage: 150,000 miles.

Asked on October 10, 2011

Rear brake dragging, locking up

Okay I have have replaced everything in the system except the abs computer and booster. Calipers, rotors rubber lines abs pump all been replaced twice rear still locks up. Used compressed air and blew lines no help. I am lost. I am a Aircraft mechanic by trade,on the side I repair cars this is my personal car. I said that to say that am not someone who is new to repairing cars. But maybe I missed something. I tried an online Mercedes repair tech NO HELP.
Avatar Asked by drrckh1

Answer

Replied on October 10, 2011

I will assume that there are no leaks in the rear. have you checked the proportioning valve?

Tiny Answered by Jacobandnickolas (expert)
57,318 answers provided
Replied on October 10, 2011

I have been unable to find it, that was my next thing to try. I have been looking for a replacement on line as week type.

Tiny Response from drrckh1
1 question asked
Replied on October 10, 2011

Since brake bias is done with the master cylinder I don't think there is a proportioning valve. I can't find a listing for one.

Tiny Response from drrckh1
1 question asked

Replied on October 10, 2011

You are correct. I just checked and there isn't one listed.

Tiny Answered by Jacobandnickolas (expert)
57,318 answers provided