Low brake pedal solutions?
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,370
Likes: 0
From: Southwest Ranches FL
Momo, GDaina; I need low brake pedal solutions?
I've bled the brakes 'til I'm blue in the face, going through well over a quart of fluid. I replaced the rubber lines with braided stainless jacketed lines. The master cylinder is new (and good). The booster works finew and does not leak. Since there are no adjustable rods available to go between the master cylinder and the booster, I would like to replace the master cylinder with one with slightly larger pistons. Have any of you done this? What master cylinder will work? (It has to be designed for 4 wheel disks).
[Modified by jsimpson, 9:46 AM 2/9/2002]
[Modified by jsimpson, 9:46 AM 2/9/2002]
Racer
Joined: Sep 2001
Posts: 304
Likes: 0
From: honolulu HI
Re: Low brake pedal solutions? (jsimpson)
have u replaced all ur calipers at anytime with ss inserts are they still the originals?i had this problem for ever and had to replace calipers to resolve it..now they are perfect..
Pro
Joined: Aug 2000
Posts: 708
Likes: 21
From: Montrose CA
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
The tip of the push rod on my '76 is adjustable... I did turn it out about one quarter turn and I may go in for another quarter to bring my pedal up a little higher.
Instructor
Joined: Feb 2001
Posts: 122
Likes: 0
From: Greensboro NC
Re: Momo, GDaina; I need low brake pedal solutions? (Carl in LA)
If you adjust that rod too far, it won't allow the cylinder to return all the way and wear your brakes down faster.
Just happened to me. :yesnod:
Just happened to me. :yesnod:
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,370
Likes: 0
From: Southwest Ranches FL
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
Curly, that's why I'd rather have a master cylinder with larger pistons.
Ganey, the pedal is solid as a rock! It's just too close to the floor for my comfort!
Ganey, the pedal is solid as a rock! It's just too close to the floor for my comfort!
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Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,370
Likes: 0
From: Southwest Ranches FL
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
How could the proportioning valve be affecting pedal height? All it does is regulate pressure to the rear calipers...???
Instructor
Joined: Sep 2001
Posts: 135
Likes: 0
From: Ontario
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
I had this problem and it can drive you crazy.......what I did was change the rear calipers (after everything else I changed) and although I did not believe it could correct the problem.....it did.
The problem was that the calipers were not leaking fluid but had pinholes in the piston which allowed air to be drawn into the system thus the soft/low pedal. Once I changed the calipers.........end of low brake pedal......hard as a rock now
The problem was that the calipers were not leaking fluid but had pinholes in the piston which allowed air to be drawn into the system thus the soft/low pedal. Once I changed the calipers.........end of low brake pedal......hard as a rock now
Burning Brakes
Joined: Feb 2001
Posts: 866
Likes: 1
From: Peabody,MA,USA
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
I don't know the rhyme or reason behind the proportionate valve affecting the pedal height but I have experienced it in the past. After changing every other part of the braking system I changed the proportionate valve, it was the only part left to change, and the pedal came right up to normal.
What makes sense with your low pedal anyway,. There is no logical reason that you should have to install a longer rod unless something was wrong.
What makes sense with your low pedal anyway,. There is no logical reason that you should have to install a longer rod unless something was wrong.
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Re: Momo, GDaina; I need low brake pedal solutions? (jsimpson)
Common problem on Vette 4 pistons when you bleed with a new master cyc. and booster. Adjust the rod length, (there should be an adjustment on the tip going into the master cyl.) for about 3/4 - 1" of peddle free travel before you FEEL the tip contacting the piston.
I have bled and bled a 73 and 68 and never got that hard peddle. I then used the PHOENIX INJECTOR system with their Reverse Fluid INjection method, and WOW it got the air out. Basically you are injecting fluid from the bleeder screw and pushing the air out of the master cylinder. Do this after a flushing and bleeding. This little tool really works. Their site address is
WWW. PHXSYSS.COM. Hope it helps.
Jim
73BB
I have bled and bled a 73 and 68 and never got that hard peddle. I then used the PHOENIX INJECTOR system with their Reverse Fluid INjection method, and WOW it got the air out. Basically you are injecting fluid from the bleeder screw and pushing the air out of the master cylinder. Do this after a flushing and bleeding. This little tool really works. Their site address is
WWW. PHXSYSS.COM. Hope it helps.
Jim
73BB
