55 brake bleeding

[Al M.]

I've bled my brakes twice now and can't seem to get the pedal from going to the floor. Using a pressure tank. Good pressure. No air seems to be in the lines. Not sure if I've got the master cylinder piston adjusted right to the brake pedal. Can't find a proper setup procedure for this. Could this be the problem?

[Edward J.]

Re: 55 brake bleeding

Al, what kind of work was done on the brakes? a pressure bleeder should make the job easier.

[Al M.]

Re: 55 brake bleeding

this is the end of a frame off restore. wheel cylinders and master cylinder were re-sleeved. all new brake lines. used 15 lbs of pressure. went from rear left to rear right. Then front right to front left last. Did this twice. No air in any of the lines that I can see in the drain tube I used on each of the bleeders. I pumped alot of fluid. Just can't get the pedal up.

[Edward J.]

Re: 55 brake bleeding

Al, did you try to bench bleed the master cylinder before install?this some times helps when the system is completely dry. one of the things I sometimes see is the fittings not properly seated at cylinders or where ever they attach, stainless lines are a real bear to seat properly.( if used)

[Al M.]

Re: 55 brake bleeding

did not bench bleed master cylinder. Can try. NCRS judging is my desire so, no stainless.

[Edward J.]

Re: 55 brake bleeding

Al, is there any resistance in the pedal when depressing, as those you may be pushing fluid?

[Al M.]

Re: 55 brake bleeding

it has a little but not a lot

[Edward J.]

Re: 55 brake bleeding

Are the brake line fittings dry enough if you pumped the pedal and went looking for leaks you could find something?when you use the pressure bleeder at 15 psi that might not show a leak, but when you pump the pedal, theres more pressure as you pump the pedal-hence it may show a leak some where,

[Joe R.]

Re: 55 brake bleeding

Al, not sure if this is the cause, but you mentioned that you bled lr, rr, then rf, lf. You should start at the FURTHEST wheel from the master, the right rear, then the lr, rf, lf.

Joe

[Al M.]

Re: 55 brake bleeding

no visible leaks. Dryzorb on floor under each wheel. No spots after pumping. Had pressure up to 20 lbs before dinner and stayed steady when I cam back out so it seems tight.

[Edward J.]

Re: 55 brake bleeding

Did you try just pumping the brakes and manuelly bleeding the system?

The other thing you can test is the master cylinder, take the line off and plug the end of master cyl. with a brass fitting or take a old line and pinch off the end and step on pedal, it should be hard, if theres no air in the master.

[Al M.]

Re: 55 brake bleeding

I read a procedure and the rear left seems to be the farthest. The junction block is on the rear right and the longer line goes to the left. Then front right with front left being last. From a line length standpoint, I think I'm correct. Front right is on the other side of the crossover.

[Al M.]

Re: 55 brake bleeding

can also try a manual bleed. can do. I like the idea of checking the master cylinder with a shut off. will do both. thanks. I'll let you know how I make out tomorrow. thanks

[Edward J.]

Re: 55 brake bleeding

AL, sent you a P.M.

[Roy B.]

Re: 55 brake bleeding

Are you sure the brake pads are adjusted correct.??