rear brake dragging, locking up

1995 MERCEDES BENZ SL500
150,000 MILES
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DRRCKH1
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  • 3 POSTS
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.
Oct 10, 2011 at 9:42 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
I will assume that there are no leaks in the rear. have you checked the proportioning valve?
Oct 10, 2011 at 9:45 AM
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DRRCKH1
  • MEMBER
  • 3 POSTS
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.
Oct 10, 2011 at 10:10 AM
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DRRCKH1
  • MEMBER
  • 3 POSTS
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.
Oct 10, 2011 at 10:14 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
You are correct. I just checked and there isn't one listed.
Oct 10, 2011 at 10:17 AM
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