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Re: Power Disc Brake Problems
[Re: Rat_Exterminator]
#135191
10/11/08 07:17 PM
10/11/08 07:17 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
Pedal now sometimes goes to floor and brake light comes on. Checked vacumm at distributer, have about 12" at idle, brakes seem to be better at higher RPM, pulled master cylinder cover, front side full to overflowing(almost) and rear is two thirds empty.
Vacuum is not your problem when the brake pedal goes to the floor. Sounds like you have a fluid leak and/or your master cylinder is going bad. The missing fluid is what you should be chasing... 
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Re: Power Disc Brake Problems
[Re: Rat_Exterminator]
#135193
10/11/08 11:09 PM
10/11/08 11:09 PM
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Joined: Feb 2003
Posts: 8,680
Andrewh
master
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master
Joined: Feb 2003
Posts: 8,680
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rear resivoir is for the front brakes.
It sounds like your mc is bleeding by internally.
It is pushing fluid from the rear to the front of the mc. That is why you have extra fluid there.
I would also be concerned about it being sucked into the booster and then leaking along the firewall.
No it does not have to be empty.
If the cup seal goes bad, it cannot "push" enough pressure to actuate the brakes and you get a to the floor event, plus a brake light due to not enough pressure.
Last edited by Andrewh; 10/11/08 11:10 PM.
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Re: Power Disc Brake Problems
[Re: Rat_Exterminator]
#135196
10/14/08 11:31 PM
10/14/08 11:31 PM
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Joined: Mar 2005
Posts: 7,052
Madera, CA.
MowP4rsn
master
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master
Joined: Mar 2005
Posts: 7,052
Madera, CA.
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Quote:
I think you may be on to something there Andrew. Front portion was full to point of spilling over. Is the solution to replace the complete master cylinder and reservoir? Thanks Greg
Greg, I had this exact problem a few days ago.
Before you go pulling the M/C to swap it out, if you have power brakes, check the length of the rod going into the M/C from the booster and check the depth of the hole from the back surface of the M/C to the primary piston in the bore.
I checked mine after loosening the 4 nuts and found the pushrod was too long.
After sticking a small screw driver into the bore, then using my thumb to indicate the mounting surface of the M/C (a makeshift gauge)and comparing the length of the screwdriver blade to the length of the rod protruding from the booster, I eyeballed it and turned the rod clockwise about 1 1/4 turn, and got it to be equal in length to my gauge.
You can use a tire tread depth gauge to get better accuracy, or a small measuring tape or pocket ruler it you have one.
Everything is ALL good now. Chaz now brakes like it should, and that might be all you need to do.
Good luck! 
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