Thread: Brake problems

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Got a friend that has a mini van, who just did a brake job.
after doing the brake job he bleed the brakes from the furthest to the closest.
He had to replace both rear wheel cylinders that had been slowly leaking.
Now when he goes down the road after a couple miles the front brakes started looking up. I have not looked at it, since I'm still in stitches from my operation. Could the valve be sticking under the master cylinder from dirt or something else. I've never had this problem before, any ideas guys.
Thanks for your help. Kurt

This happened to me once on my '36 chevy. Had crud in the lines that caused the fluid to go out into the brake cylenders but it couldn't return to the master. Flushed out all of the lines and got it cleared out and it worked fine after that.

That happened t me once in the middle of a military high speed armored convoy----result of mixing of brake fluids--very interesting talking to rear units of convoy about why the units in front of them were suddenly running off the road into the woods on both sides

Well heck that ain't good. Kurt

Make sure there's sufficient clearance between the pedal push rod and master cylinder piston when the pedal is at rest. The piston may not be coming back far enough to vent the port back to the reservoir.

Bob

Originally Posted by bobscogin

Make sure there's sufficient clearance between the pedal push rod and master cylinder piston when the pedal is at rest. The piston may not be coming back far enough to vent the port back to the reservoir.

Bob

Bob
How much clearence should you have. I have a disc./ drum set up and a very low pedal. I've bled them and adjusted the rears and it's still low. My pedal push rod is pretty tight, in fact I had to pry it a little to get the bolt through. The rod is adjusted all the way in, so do I need to shorten the rod a 1/4 inch or so. Sorry to Hi- Jack this thread, but thought I could jump in and get some help.

Thanks Don (oldschool66)

Shouldn't need a lot of clearance-maybe 1/16" to 1/8". If you had to pry on it to get the through bolt in, your pre-loading the master cylinder piston and that's not good. Shorten it 1/4", as you suggested, and then use the adjusting clevis to get the clearance correct.

Bob

Originally Posted by bobscogin

Shouldn't need a lot of clearance-maybe 1/16" to 1/8". If you had to pry on it to get the through bolt in, your pre-loading the master cylinder piston and that's not good. Shorten it 1/4", as you suggested, and then use the adjusting clevis to get the clearance correct.

Bob

Thanks Bob, I will be back at it tonight! What a great board this is, nice straight answers with no sarcasim when you need advice, this may take some getting used to, after building 6 hot rods I'm still finding things I have not come across before!