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Brake pedal goes to the floor with the engine off

Tiny
DWANE MENKE
  • MEMBER
  • 1999 GMC C3500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 107,000 MILES
Brakes were working fine until I hit a patch of ice. The ABS system engaged worked properly, but right after the ABS went on I lost pressure at the pedal. I have inspected each wheel I did not see any brake fluid leaking. The master cylinder was low but not empty. I am thinking it may be the master cylinder or the brake booster. Any help would be appreciated.
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Wednesday, January 4th, 2017 AT 7:09 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hello,

It sounds like the master when bad which is common when the ABS came on here is guide to help you replace the master.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Please let us know what happens.
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Wednesday, January 4th, 2017 AT 12:21 PM
Tiny
JAMIEJONES
  • MEMBER
  • 1 POST
I had this problem and had to replace the master cost me $132.00 all fixed great guide BTW.
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Tuesday, June 25th, 2019 AT 5:10 PM

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