1994 Geo Prizm Brake problem

Tiny
PRCSPC
  • MEMBER
  • 1994 GEO PRIZM
  • 1.6L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 190,000 MILES
The pedal goes to the floor. I have replaced the master cylinder twice in case the first one was bad. I replaced the block where all the lines meet. I have vacuum bled and gravity bled and bled with the brake pedal several times and cannot get the pedal to pump up. I get oil to squirt from every bleeder with no air, yet I cant seem to build pressure. There is no leak because the fluid level doesnt drop and I cant find a puddle or leak in the line. Very baffled please help. Oh also the car does not have ABS
Sunday, June 29th, 2014 AT 5:04 PM

8 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you tried clamping off each brake line to each wheel one at a time to see if the pedal pumps up?
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Sunday, June 29th, 2014 AT 7:46 PM
Tiny
PRCSPC
  • MEMBER
  • 5 POSTS
We have not tried that yet. My cylinders arent leaking though. But I will try this tomorrow night. I will get back with you with the results. Thanks
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Sunday, June 29th, 2014 AT 8:34 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I have ran into calipers etc internally leaking pressure causing what your dealing with.
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Sunday, June 29th, 2014 AT 9:00 PM
Tiny
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  • 5 POSTS
How would you suggest I clamp the lines without damaging them?
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Sunday, June 29th, 2014 AT 9:14 PM
Tiny
PRCSPC
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  • 5 POSTS
Vise grip the hose at the caliper/cylinder?
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Sunday, June 29th, 2014 AT 9:16 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You can use needle nose vice grips with a rag between the the vise grips and the hose. Dont go crazy clamping them super tight. Only do it to the rubber lines and make sure you inspect the lines after you clamp them for damage.
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Sunday, June 29th, 2014 AT 9:25 PM
Tiny
PRCSPC
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  • 5 POSTS
I capped the right rear with an inverted flare fitting and a plug in front of the hose, and still no pedal. I left this one plugged and plugged the left rear and viola pedal. I then uncapped the right rear and hooked it back up and still had pedal. I am now in the process of replacing my cylinders, shoes, hardware and hoses, and the line from the hose to the cylinder on both rears and the pads in the front. I also have a bleeder screw in the front right that had been broken off, so I might as well get it out and put in a new one. Thanks for your suggestions. Next project is to install carrier bearings in the rear end of my Suburban 1500 FWD. I may be back for that.
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Monday, June 30th, 2014 AT 8:57 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Your welcome glad to hear you figured it out thought I would share my trick with you that helped me.
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Monday, June 30th, 2014 AT 9:08 PM

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