Brake problem
#1
Senior Member
MASTER BUILDER
Thread Starter
Join Date: Oct 2003
Posts: 144
Brake problem
Ok, I know it sounds pretty elementary , Brakes on an old don hardy chromoly chassis, frame mounted master , Lamb calipers, front, Willwood rears.
Car had a problem with locking up, when down at the end of 1/4 m.
We found the master had some crud in it, as it was under the car and close to the ground it picked up a bit of dirt, kida rusted up a portion of the inner bore of the master.
I replaced with the matching part, same situation, except the brake rod is returning all the way back but there is still brake pressure in the system.
I figured, possibly line lock, eliminated that issues, problem still persists.
Bled the darn thing 20 times, still no luck.
Anybody?
Car had a problem with locking up, when down at the end of 1/4 m.
We found the master had some crud in it, as it was under the car and close to the ground it picked up a bit of dirt, kida rusted up a portion of the inner bore of the master.
I replaced with the matching part, same situation, except the brake rod is returning all the way back but there is still brake pressure in the system.
I figured, possibly line lock, eliminated that issues, problem still persists.
Bled the darn thing 20 times, still no luck.
Anybody?
#2
Brake
Which brakes are locking? I would replace the flex line to the rear brakes and the flex lines to the front wheels. A friend had a similar problem with a hydraulic clutch. The line had swollen internally and acted as a oneway valve. Replacing the line fixed the problem. Would also look for a crimped line and sticking calipers or wheel cylinders.
#6
Senior Member
RACING JUNKIE
Join Date: Sep 2007
Location: Montvale, VA
Posts: 1,431
That still wouldn't prevent the line pressure from releasing,since the residual valves actually hold pressure on the line.Not enough to cause a drag or lock up,but not having them wouldn't create his problem
#7
Senior Member
MASTER BUILDER
Thread Starter
Join Date: Oct 2003
Posts: 144
I think we solved the problem.
The car has a remote pressure guage that runs down the length of the front frame, pretty close to the header. When we rebuilt the system, I did not realize I had to bleed the guage. Thus there was a big air pocket. As the car heated the air expanded and it somehow locked the master. We are going to give it a try tonight and see it it solves the problem.
Thanks for all the help.
Al
The car has a remote pressure guage that runs down the length of the front frame, pretty close to the header. When we rebuilt the system, I did not realize I had to bleed the guage. Thus there was a big air pocket. As the car heated the air expanded and it somehow locked the master. We are going to give it a try tonight and see it it solves the problem.
Thanks for all the help.
Al