Brake problems?

[mopar]

sound like to me , the master clyinder is your problem. ( not holding presser at all time)


Ron Waters 1346 s/st

[art leong]

I just went out and tried the brakes with the motor off.
When I pushed hard (2 feet) the pedal slowly sank.
When I tried it before I got a firm pedal and just figured it was good.
So now I'm pretty sure it's the master cylinder.

[Phillip marvetz]

Either the master cylinder or you have a small leak that is letting air in. Did you put in a hydraulic switch or pressure gauge? My vote is the master cylinder though.

[chris ok]

any time you bleed a used master cylinder you have to be careful to not bottom it out.
Are you moving to much volume of fluid? Don't manual brakes use a smaller diameter bore piston. One possibility.
Honda an some other companies screw their hat rotorrs to the hub. One screw w a tapered head, supposedly helps with the pedal. saw it saturday at work. they screwed it together and corrected a shimy and a pedal issue. These are lightweight rotors with heavy clamping on the calipers from your ratio and line pressure. second possibility
Any time I've taken brakes apart you always have to re seat them too.

[art leong]

I'm changing the master cylinder, And see if that helps.
I also am wondering if I used a bigger piston caliper (now 54mm change to 60mm).
Would this increase the static ( against the converter) holding? I'm not sure if a larger piston would increase the static holding with the same rotor?

[Eddies66]

http://www.carcraft.com/techarticles...der/index.html

[art leong]

Originally Posted by Eddies66

http://www.carcraft.com/techarticles...der/index.html

Thanks for this I read it and it answers some of my questions.
But the Chrysler FWD cars. are biased brakes (?) the front part of the master supplies the right front and left rear wheels, the back chamber supplies the left front and right rear.
I have changed all that and and now my 2 front wheels are supplied by the rear part and my rear wheels are supplied by the front section.
One thing that the article brings to light is that my fronts have 54 mm pistons my backs have 34mm pistons. The stock setup would supply a 54mm and a 34mm piston. Now my fronts call for two 54mm pistons. I wonder if I have the volume to supply them? The master cylinder is 22mm. Not sure of the stroke though.