Dragging brakes
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Dragging brakes
HEllo all
I have a 1980 ford f150 with a inline 6, bw4spd, 9"rear, 44 dana front. anyways i have swapped out the calipers because they were old and sticking, master cylinder was replaced because it was leaking. and ended up replacing almost all the hard lines, and the two front rubber lines on the brake system.
My problem is that after bleeding the brakes in the rear the pedal is fairly firm, then bleed the front, and the pedal gets spongy. I bench bled the mc until their was no bubbles in it and the piston moved less than 1/8th of an inch. Installed it while replacing the hard lines as needed. Still cant get a firm pedal, and the front disc brakes drag and create alot of heat for the front bearing, which worries me. What am i doing wrong?
Any ideas or helpful suggestions would be greatly appreciated
Also is there any way to bleed the proportioning valve, or do i need to, three of the five lines going into it were replaced.
Harmon
I have a 1980 ford f150 with a inline 6, bw4spd, 9"rear, 44 dana front. anyways i have swapped out the calipers because they were old and sticking, master cylinder was replaced because it was leaking. and ended up replacing almost all the hard lines, and the two front rubber lines on the brake system.
My problem is that after bleeding the brakes in the rear the pedal is fairly firm, then bleed the front, and the pedal gets spongy. I bench bled the mc until their was no bubbles in it and the piston moved less than 1/8th of an inch. Installed it while replacing the hard lines as needed. Still cant get a firm pedal, and the front disc brakes drag and create alot of heat for the front bearing, which worries me. What am i doing wrong?
Any ideas or helpful suggestions would be greatly appreciated
Also is there any way to bleed the proportioning valve, or do i need to, three of the five lines going into it were replaced.
Harmon
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Dragging brakes
The 78's have a pin on the proportioning valve ,that you pull out when bleeding the brakes.
Check your maybe it is the same.
Also, has the truck just been sitting around ?
Maybe the calipers are seizing up ?
Check your maybe it is the same.
Also, has the truck just been sitting around ?
Maybe the calipers are seizing up ?
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Dragging brakes
Mil1ion
Yes the truck has sat for the previous eight, yes eight years. I will check the proportioning valve this weekend when i have time to further explore the possibilities. I also plan on bleeding the system, fitting by fitting, every tube going in and out of mc, and proportioning valve if neccesary. Your insight has been appreciated and it will be the first thing i check.
Yes the truck has sat for the previous eight, yes eight years. I will check the proportioning valve this weekend when i have time to further explore the possibilities. I also plan on bleeding the system, fitting by fitting, every tube going in and out of mc, and proportioning valve if neccesary. Your insight has been appreciated and it will be the first thing i check.
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Dragging brakes
All,
I have replaced the
Master Cylinder
Front Brake Calipers
Front Brake hoses
1-line from the master cylinder to proportioning valve
2-lines from proportioning valves to calipers.
Master cylinder was bench bled until all air bubbles disappeared, while keeping it level. The stroke at the end was very short, less than one/eighth of an inch.
Brakes were bled in succesion, from rear to front. The only thing I can come up with is air hanging up in the proportioning valve.
I am bleeding the entire system again tomorrow on my weekend off. More news after that.
Any new ideas are always welcome
Harmon
I have replaced the
Master Cylinder
Front Brake Calipers
Front Brake hoses
1-line from the master cylinder to proportioning valve
2-lines from proportioning valves to calipers.
Master cylinder was bench bled until all air bubbles disappeared, while keeping it level. The stroke at the end was very short, less than one/eighth of an inch.
Brakes were bled in succesion, from rear to front. The only thing I can come up with is air hanging up in the proportioning valve.
I am bleeding the entire system again tomorrow on my weekend off. More news after that.
Any new ideas are always welcome
Harmon
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Dragging brakes
All
I bled the brakes again, and notice the popout valve on the proportioning valve. It was stuck in place, it now moves with the application and release of the brakes. Drove it into town, and the bearings didn't heat up near as bad, hopefully that takes care of the problem.
More news as it becomes available.
Harmon
I bled the brakes again, and notice the popout valve on the proportioning valve. It was stuck in place, it now moves with the application and release of the brakes. Drove it into town, and the bearings didn't heat up near as bad, hopefully that takes care of the problem.
More news as it becomes available.
Harmon
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