Brakes lock up

1991 MERCEDES BENZ 190D
260,000 MILES • 2.6L • 6 CYL • 2WD
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BRIANGAILEY
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  • 1 POST
I have a 1991 Mercedes 300e and the brakes lock up while driving down the road. As I am driving the brake peddle gets hard and doesn't move and the brakes lock up. I have replaced the brake booster, master brake cylinder, all 4 calipers, all 4 brake hoses and swapped out the abs control box and I have no idea what to do next. Can someone please point me in the right direction?
Mar 13, 2016 at 5:48 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Check that you have pedal clearance between the brake pedal and the master cylinder, you should be able to feel a few mm free movement when you push the brake pedal down, there will be adjustment on the pushrod into the booster.
Mar 14, 2016 at 3:10 AM
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