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Old June 29th, 2008, 06:38 PM   #1
t buff
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I got a yj with 4 wheel disc i am getting no pressure pedal goes to the floor. I have a corvette master. what i am wondering is on a corvette master is it the same as a disc drum master , does the front work the back and back work the front? i need help on this one
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Old June 29th, 2008, 07:07 PM   #2
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master cylinders are all the same the booster side is rear and the fronts are at the other end. if its a no pressure issue I would see if you have a blown flex hose. I have seen them blow up like ballons on rear disc conversions.
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Old June 30th, 2008, 09:57 AM   #3
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Originally Posted by t buff View Post
I got a yj with 4 wheel disc i am getting no pressure pedal goes to the floor. I have a corvette master. what i am wondering is on a corvette master is it the same as a disc drum master , does the front work the back and back work the front? i need help on this one
Which Corvette master (what piston size?).

Did you bleed the master?

Did you bleed the brakes?
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Old June 30th, 2008, 05:29 PM   #4
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Originally Posted by Yetti View Post
master cylinders are all the same the booster side is rear and the fronts are at the other end.
unless i misread this, i don't think all m/c are the same like you stated. CJ m/c vs. YJ m/s are reversed front/rear in comparison to each other
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Old June 30th, 2008, 05:34 PM   #5
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did you try gravity bleeding it first? maybe air in master
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Old June 30th, 2008, 08:03 PM   #6
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did you check the push rod and make sure its right??? might be to short or to long. if its to long you could of rolled the cups in the master. im sure you looked for leaks before asking for help. so i would say if you blead it and still having a problem you might of rolled the cups!
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Old June 30th, 2008, 08:19 PM   #7
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The master is from a 69 vette- i bench bled it gravity bled it bled from the calipers to the master nothing works- i pinched off the rear brake hoses and tried that - nothing the push rod is the stock yj one i tried to adjust that when i make it shorter the pedal comes up but the calipers dont pinch the rotors hard enough to stop
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Old July 1st, 2008, 08:17 AM   #8
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I don't know to much about a Jeep,but heres some info http://auto.howstuffworks.com/master-brake2.htm . I do know if you have 4 wheel disk brakes you need a 4 wheel disk brake master cylinder. I used one out of a 2001 chevy truck with 4 wheel disk brakes. I took a screw driver and pushed in the piston on my old master and took a measurement and then I measured the new one and they were the same. My brakes were soft and would push to the floor after I put on rear disk brakes,now there rock hard. hope this helps.
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