89 LE - Dragging Brakes - Ohhhh, boy, here we go again! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-27-2007, 07:38 PM   #21
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John I think that car is pissed at you... I'll be around tomorrow, or at least I'll have the Cell phone

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Old 06-27-2007, 08:37 PM   #22
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Quote:
Originally Posted by jr's3800
John I think that car is pissed at you... I'll be around tomorrow, or at least I'll have the Cell phone
Great googlymoogley....how many things can go wrong on your car!!!

The brake problem has me baffled. I figured your caliper pins were just sticking and you were sucking air into the master cylinder from a poor bleed job (if one of the pins is stuck, you really can't bleed them out right, cause the piston in the caliper doesn't have something hard to press against...I'm guessing that was the loud "clunk" you heard..the caliper popping on the the pin when the pressure got high enough.
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Old 06-27-2007, 09:01 PM   #23
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No, I made sure the caliper had full travel on the pins with the piston compressed, they were fully greased, and the noise happened on smooth road and i was not applying the brake at the time.

ALSO. I just had to run into town for a second. You ask what else can go wrong?

Now she doesn't wanna start. It took me a little over a minute of cranking 3 sets, 2 occasions to get her started again. What in the HELL is up with this car all of a sudden?!
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Old 06-28-2007, 06:20 PM   #24
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FOR FUTURE REFERENCE...

anyone changing a master cylinder, on an 87-91, and possibly other years as well, you will NEED to have the correct wrench sizes. The fittings are 15/32 and 17/32 god knows why they did this, but do NOT use any other size, you WILL strip them out.

I now have to go buy 2 more wrenches now because I only have them in 16ths and that just isn't cutting it.
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Old 06-29-2007, 09:13 PM   #25
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Never mind on the above thread. Those ARE the sizes for the fittings, but you actually need a 12 and 14 mm flare nut wrench, it'll work much better.

Anyways, so I replaced the master cylinder today...with MUCH difficulty. Thank you Don for keeping me sane while doing it I think there might be SOME air somewhere in the system, very possible that theres still a little in the MC bore, but they stop 300% better. Stops with half the effort and when i use the same effort I used to, it THROWS you forward MUUUCH better. Now to conquer the rear shoes and maybe bleed it the rest of the way when I get back.

My old cylinder had a HUGE amount of CRUD come out of it, TONS of black crud. Just took it back for the core refund and so I never have to deal with it ever again.

I hope nothing else goes wrong, but for now, i'm happy
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Old 06-30-2007, 04:12 AM   #26
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Glad to hear you got it fixed... It really wasn't that hard was it... lol... Thats how you learn... The next time you have to do this you'll have a good idea of how it works.... at least the car is stoppable now... Now on to the rear brakes

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