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Author Topic:   Brake Pressure Problems?
Kromulous
Dirt Forum Champ
Total posts: 796
posted April 25, 2005 08:31 AM  
Finnally got the plastic brake lines and new calipers on the car, and begin to bleed the system out.

Problem now is i cant seem to get the pedal to feel real stiff. Seems like the front is back bleeding back into the master cylinder.

Anyone run residual valves on their cars?

Our pedal set is from Tilton (reverse/swing mount) and its got new Wilwood composite MC's on it. The calipers are new, Ford on the front, big metric on the rear. and the rotors are 1.0625 thick, not the .810's.

Any ideas? Just cant get a good pedal, bleed them out about 4 times now, no air, is it the flex in the plastic lines? or do i need to slap on some residual valves to fight back bleeding?

Thanks for any help, Krom.

rpm20
Dirt Freak

Total posts: 338
posted April 25, 2005 08:44 AM  
we run the same stuff, did the 2 person pump and bleed 4 times and then it was right.
had lots of trapped air in the new calipers.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted April 25, 2005 08:47 AM  
First off the plastic lines flex, did you read the circle track article with brake experts? I dont got alot of what circle track says but they had some good points.

as far as air in the lines, we had to pull my calipers off earlier this year and compress them with a c clamp, then bleed the line, then bleed the caliper, and had to do them upside down once.
for some reason they got air trapped and were a huge pain!

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 25, 2005 08:57 AM  
you'll have to have someone watch each brake fitting when you pump the brakes and then let off for air of some sort. It also could be that you don't have the line tight enough to the chassis in a couple places allowing it to flex. Run your bias all the way one way and do it, and then all the way the other and that'll give you a place to start looking.

A&M Motorsports
Dirt Maniac

Total posts: 117
posted April 25, 2005 09:02 AM  
Krom, make sure that you don't have a piston that is over extending out of the caliper. As you probably know the pistons are designed to extend a certain amount.

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Artie Perilloux
A & M Motorsports

Kromulous
Dirt Forum Champ
Total posts: 796
posted April 25, 2005 09:36 AM  
I'll check for brake lines flexing, i'm pretty sure i got them all tacked down well, but will double check, and over do it.

A&M, i was worried about that as well, i looked at them yesterday and the piston is out of the caliper anout 1/8th of an inch. So i think thats good. I got new pads (thicker) cause i was worried this would happen.

I dont see any leaks either, everything seems to be sealed up. The pedal will get hard on about 3 pumps, maybe 2. So that leads me to believe there is air in there somewhere.

Think i'll take the calipers off and turn em upside down to try and get that air out.

Is there some kind of bleeding device that could help with this process. Brakes on this car has been a thorn in my side for some time now, dag blasted things anyway!.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 25, 2005 09:54 AM  
you might try bench bleeding the master cylinders

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