• Tiny
  • Theo Zicko
  • 1991 Mercedes Benz 420sel

Brakes problem
1991 Mercedes Benz 420sel V8 Four Wheel Drive Automatic 180000 miles

How difficult is it to replace L & R rear calipers, pads and sensors on this car? I have done this on an early model Volvo but on this car I do not know. Right now after installing a new master cylinder, the rear
caliper pistons that hit the disk now do not withdraw completely and consequently it feels llike a slight drag while the car is moving. The sensors apparently are constantly in contact because they are melting. I have tried lubricating the pistons that fail to withdraw once your foot is off the brake but they fail to do so. Any suggestions as to how I can correct this problem? I guess the new master cylinder is exerting too much pressure on the old calipers. Can removing some of the brake fluid help the situation?

Tuesday, July 20th, 2010 AT 1:17 PM

1 Answer

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Recheck part number for master for your car make sure it is for a four wheel disc brake. If master is for rear drums it has a check valve that holds residual pressure to rears so caliper will be partialy applied.
Let me know
Thanks for donate

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Tuesday, July 20th, 2010 AT 2:57 PM

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