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1978 Cadillac Fleetwood brakes

Tiny
JESSECANTU
  • MEMBER
  • 1978 CADILLAC FLEETWOOD
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I have replaced all four calipers along with the master cylinder. I have also bled all four brakes but the brake pedal still goes all the way down to the floor with no resistance. Any idea what it could be?
Wednesday, May 6th, 2009 AT 9:22 PM

3 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Either a faulty master cylinder, or air trapped in the system. Did you bench bleed the master cylinder by chance?
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Wednesday, May 6th, 2009 AT 9:51 PM
Tiny
JESSECANTU
  • MEMBER
  • 2 POSTS
I did bench bleed the master cylinder. It took quite a while and it was working alot better out of the car. It is shooting up less fluid, now that it is installed.
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Thursday, May 7th, 2009 AT 10:20 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Was there perhaps a pushrod left out of between the M/C and the booster. And are both the replaced and the replacement M/C identical? When you bled the system, was it a manual bleed, and were you getting good fluid flow. The only thing I could suggest is more bleeding, or to isolate the cylinder you would need to plug the ports and see if pedal is back. I would think you should have some resistance. Crack a bleeder at any wheel, and have a second person press down on pedal, close bleeder on downstroke of the pedal to prevent air being drawn in. See if you can get some fluid movement.
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Thursday, May 7th, 2009 AT 10:36 PM

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