Slick 60's

A few years ago I installed a Mustang dual master cylinder on my 64 F100, and installed a Willwood proportioning valve in the line to the rear brakes. I decided to bleed them today, and could not get any fluid out of the rear bleeders - no matter how hard I pressed the brake pedal. I've not read anything about this on the Slick 60s fourm, but I doubt if I'm the only one to have this problem. Perhaps I'm the only one to try to bleed the brakes after the initial installation.

After thinking about it, I belive the solution is to take all adjustment out of the proportioning valve. I intend to try it tomorrow.

Has anyone else had any such experience? If so, what was their solution?

thanks in advance.

I had a Wildwood proportioning valve in my 56. I had the same results
as you. After adjusting it all the way open and not getting any changes, I removed the valve. It worked better without it.

did they bleed when you installed the MC and PV? If they did, then I would say it is cloged or something.

MadMaxetc wrote:did they bleed when you installed the MC and PV? If they did, then I would say it is cloged or something.

If it's been a while, water & mud can collect in the bleeder screw hole & pretty much seal it shut. If you unscrew the bleeder screw all the way, you should get some free flowing fluid.
Then just either replace the bleeders, or take a small drill bit to them & dig all the crap outta there. If it doesn't flow with the screws removed, you've got further problems.

BTW, to avoid getting rust in there, I've gotten in the habit of dabbing some wheel bearing grease in there & slipping one of those rubber vacuum caps over the nipple when I'm done bleeding. That keeps the hole inside looking like new & free of crap, works great.

Slick Fan wrote:

MadMaxetc wrote:did they bleed when you installed the MC and PV? If they did, then I would say it is cloged or something.

If it's been a while, water & mud can collect in the bleeder screw hole & pretty much seal it shut. If you unscrew the bleeder screw all the way, you should get some free flowing fluid.
Then just either replace the bleeders, or take a small drill bit to them & dig all the crap outta there. If it doesn't flow with the screws removed, you've got further problems.

BTW, to avoid getting rust in there, I've gotten in the habit of dabbing some wheel bearing grease in there & slipping one of those rubber vacuum caps over the nipple when I'm done bleeding. That keeps the hole inside looking like new & free of crap, works great.

Great tip!!