Master cylinder problem.....(UPDATED!!! & FIXED!!) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-13-2006, 07:18 PM   #1
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Default Master cylinder problem.....(UPDATED!!! & FIXED!!)

ok first off im happy with myself!!! I changed both of my Hubs & rotors/pads with no problems!!!!!!!! took me couple hrs max... had to drive around town to find a 34mm impact wrench socket...... sooooooooooooooooooooooooo


after alll of that stufff... hop in my car to test out my new brakes & noise-free hubs...
brake pedal alllllllllllllllllllllllllllllllllllllllllllllllll llllll the way to the flooor plue WSS didnt kick it..so i came to a sqeechin holt!!!!!!! long story short....master cylinder 1 isnt workin nnow!!!!!! :(
no brake juice to LF or RR has this happen to anyone else???!?!? I have a new cylinder on order w/ Auto zone... cheapest...80bucks vc 150 @ discount auto
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Old 05-13-2006, 08:10 PM   #2
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First of all, don't buy the Master Cylinder from AutoZone. They are horrible parts. Go to Napa. An 02 Bonny deserves the best you can get.. (And no, I am not much of an AC/Delco fan)


2nd, when you were putting the pads on, did you have to use a clamp to compress the piston back in? If so, did you let the compressed fluid come out of the bleeder tube? Anytime you compress that dirty fluid back into the ABS system, it'* going to have NO brakes.

Patrick
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Old 05-13-2006, 08:23 PM   #3
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Quote:
Originally Posted by Ivory03
First of all, don't buy the Master Cylinder from AutoZone. They are horrible parts. Go to Napa. An 02 Bonny deserves the best you can get.. (And no, I am not much of an AC/Delco fan)


2nd, when you were putting the pads on, did you have to use a clamp to compress the piston back in? If so, did you let the compressed fluid come out of the bleeder tube? Anytime you compress that dirty fluid back into the ABS system, it'* going to have NO brakes.

Patrick

ok, well NAPA isnt really around here anymore.. some stores sell NAPA parts but not all.
I've havent had problems be4 w/ Autozone.......

2nd.... yes I compressed the piston back in, Bled the lines, but when I went to bleed the LF, barely any fluid came out.......... I took off the brake lines to see if they were clugged... but they werent. like stated before, the RF one bled fine... squirted out a nice stream of brake fluid. well than I thought of the dirty stuff... I took a lot of the old stuff out, clean the master cylinder & the reserve tank and still the same problem. so monday or tuesday I should have my new master cylinder... ill see than! thanks!!
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Old 05-14-2006, 01:37 AM   #4
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Did you pump up the brake pedal about 20 times after changing the brakes? And if you didn't push the fluid back to the Master Cylinder..I hope you added some....otherwise you are probably pumping air at the moment.

Please give more information. By changing brakes you should not have been able to break a master clyinder.
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Old 05-14-2006, 02:10 AM   #5
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When I did mine a while back, I had a heck of a time getting a firm pedal back. That was even with a nice firm squirt of fluid while bleeding them. Even now, it'* just a touch mushier than I would like. I'm gonna be getting one of those power brake bleeders, and I expect that will take care of my issues with it.
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Old 05-14-2006, 01:38 PM   #6
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Quote:
Originally Posted by BillBoost37
Did you pump up the brake pedal about 20 times after changing the brakes? And if you didn't push the fluid back to the Master Cylinder..I hope you added some....otherwise you are probably pumping air at the moment.

Please give more information. By changing brakes you should not have been able to break a master clyinder.

yes I pumped them more than 20times... yes I added fluid, I took some old fluid out & put in new stuff. im not pumping air into the system...

well Billy, as stated above, the RF squirts out fine like normal, but the LF it drips out if any.....I've taken the brake line off at the master clyinder that fed the LF & RR, press the brake pedal and nothing came out but a drip or 2...... I dont know what is goin on with it..
I know it should have not broken b/c of the change...... im confused.... thats pretty much all the info I can give.... its not the brake lines... check them
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Old 05-17-2006, 10:22 PM   #7
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ok everyone!!! it was my master cylinder that was bad.


ok this isnt the bonnies Master, but its close to it, the circular part, which is attached to the vehicle is moved each time the brake pedal is moved. well mine was frozen in place which I guess was getting worse over time until it just was stuck for good. I also noticed that my master cylinder cap wasnt a tight seal so water & what not was getting into the system. well cleaned the brake fluid tank, got a new M.C., bled the brakes all four.... new hubs. new rotors & pads.... about 300bucks & 4days later..... my car is back on the road!!!!!! soo I admit it was my neglecting of my brakes & the cap that led to these problems.
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