Can't Get Enough
Join Date: May 2000
Location: Bastrop, Texas
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Rear Disc Brake Question
I have a question fro any of you out there that have done a rear disc conversion, first off heres a semi brief description of whats been done to mine:
* Rear disc conversion using 87 Lincoln Mark VII calipers and discs,
* Installation of rubber rear brake hoses, which meant re-plumbing hard lines from the existing hard line by the fuel tank to each caliper, fabbing brackets and installing the rubber hoses to the caliper (Don't know what hoses are off of, I went to auto parts store and spent an hour or so searching through brake hoses until I found some that met my needs)
* Removed existing proportioning valve and installed an adjustable one, which meant re-plumbing some lines. Proportioning valve is on wheel well next to (but below) the master cylinder. and I have tried adjusting it to see if that was the problem...
* I had a '79 caddy (from a caddy witth rear discs) master cylinder on it, that was suppose to provide the extra ummph req'd for rear discs, but went back to my original due to this issue, thought maybe it was the problem, but the problem still exists with the stock cylinder,,,,stock cylinder still on at this point...
Thats the jist of my rear disc projsect....now the problem is that I don't have any pedal until about an inch or two before it gets to the floor. I have bled the brakes with a hand pump (at least 6 times), Pumped the brakes while someone else bled them (both with the jeep running and not running), I have gravity bled them at least twice, and maybe more I can't remember anymore...[img]images/icons/smile.gif[/img]
The Jeep will stop, but won't lock up and no matter what I do I can't get the back pressure in the pedal that should be there, I have tested the power bosster and all the linkages, all ok,,,,,,,,,
The rear calipers use the brake pads for the emergency brake and are actuated by cables and a hand brake I installed, they are semi working but need a little more adjustment.....
Ther only thing I can think of at this point is that the rear hoses I have installed are too large in diameter (they are larger, or appear to be than the steel line), and maybe my pedal is going away because of all the fluid suddenly going into a larger area and the pressure releases.....anyone else have any ideas,,,,,I'm pretty close to having this thing on the road and this is driving me crazy.....thanks