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2004 GMC C1500 pedal will go to floor

Tiny
SJIEERERFA
  • MEMBER
  • 2004 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 47,888 MILES
Bleed all four wheels- no broken pads or shoes-no fluid leak- brake pedal usually is ok but always feels soft - can the vacuum change during low rpms or slow speeds
Sunday, February 21st, 2010 AT 3:50 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

This may be a by-passing master cylinder, this is when the fluid by-passes the primary cup seal in the master cylinder with out leaking externally, this will give you a soft sinking pedal that will pump up hard again.

Mark (mhpautos)
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Sunday, February 21st, 2010 AT 4:15 AM

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