Technical 42-48 ford brake issue

Hey guys, I've been running my AV8 for a long time with 42-48 brakes all the way around. back a few years ago my left rear started locking up when I would hit the brakes for the first few drives of the season. it would then brake as normal. well last year it never stopped. if I brake lightly it stops normal but if I come down normal from a good clip it will lock up the left rear. I thought it was one half of the wheel cylinder was stuck so I pulled the LR drum and both sides moved no problem. I readjusted all the brakes and the pedal feels great but still the left rear is locking.

thoughts??

 

When you say locking up, is it just locking and skidding during the braking or is it locking and staying engaged?
Years ago we had a '48 that would lock up until finally the drum got hot and broke. Wish I could remember the root cause.
Possible brake hose on that side that is collapsing and not letting the fluid return on that side? Bad wheel bearing heating up cylinder and fluid on that side? Drum out of round?

 

I have the same thing on the same brake on my Willys and its mechanical !! I have 42-48 brakes on my T so would like to know the remedy. JW

 

Flamed, it's only locking up during braking.... it just feels like the left rear is getting more pressure than the rest of the system. I can even feel it pull a bit to the left before it locks. It's a standard early ford setup with 39 pedals and single res. master cylinder. no proportioning valves etc. it's been working fine for 20 years. the shoes are still good as well.

 

Just for good measure you should go around and bleed the system. Peel back the rubber on the ends of that wheels wheel cylinder and check for any leaked fluid or corrosion. Sounds like fluid is going in but not being released in the cylinder. It may need to be rebuilt. You also might try adjusting the shoes inward, although I think you have a mechanical problem.

The 1950 cad Im rebuilding did the same thing. I replaced the wheel cylinders and the problem was gone.

 

I'd go looking for grease or oil on the linnings. That happens if you over grease a wheel bearing or have a little seeping of fluid at the wheel cyl. Grease or Oil will make a hard grab and it don't take much on the shoes to do it.
The Wizzard

 

Oil on the drum will cause that problem.