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I've been through every possible thread and couldn't find any answer.
Ok, heres the deal.
In my girlfriends 85 Bird, She has lost all braking capabilities a few times now. Once even when my buddy took it up to the corner store.
The circumstances of each are the same, cold, humid, and at night.
She tells me it goes to the floor and does nothing. She always pulls over pulls E-brake, parks and calls me. and when I get there they always work like normal.
Here's a list of what I've replaced so far.
Brake booster(was bad when we bought the car so I think the master has a slow leak and may be ruining it.)
Pads and rotors up front.
Rebuilt the drivers side drum system besides the dust shield and drum itself. (wheel cylinder, springs, shoes)[the old wheel cylinder fell apart in my hand]
passenger side just got shoes and springs
Bled very well on top of everything, made sure of that.
Now that I have that list out of the way, I know of a few possibilities, but I want to cover all the bases I can before I dive head first into this.
What I'm thinking is...
(like I said) the master could be bad, having a slow leak into the booster.
the prop valve could be bad?
Bad line
passenger side wheel cylinder could have went bad from the extra pressure of the drivers side not leaking.
And another Idea I'm contemplating is that when we had a little time away from each other, is when the drivers side wheel cylinder took a dump. her moron of a father just told her to keep putting in brake fluid in it and live with it, I'm thinking maybe she let it go dry at one point and there is air in the master.
Any ideas will be greatly appreciated, thanks.
__________________ Before paint
1988 Camaro Sport Coupe
305 TBI/T5, Open element, 8000K HID, Modified LO5 build in progress. 4th Gen. 3.73 Posi/Disc rear. Much more to come!
check the entire system for leaks again. if no leaks bleed at all 4 wheels starting with the wheel farthest from the master cyl, then work your way to the closest. try to bleed about 4 fl oz per wheel. make sure the fluid is not contaminated, if so the gasket under the cap will be swollen. in that case it may be necessary to replace everything all over again
I have run across this problem on a customers 85 RS. Only after replacing both the Master cylinder and proportioning valve was it solved? I don't know for sure which it was? I personally believe the master cylinder was the problem....
Pull the master loose from the booster and check for any leaks . Don't take any lines loose . Also check the wheel cylinder you didn't replace for leaks . I would say the master is the problem if the brake light isn't on or doesn't come on when you hit the brakes . If the wheel cylinder or a line was leaking then the light will come on .
__________________ Mighty 2.8 power . Enough said .
. Enough said . 
