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To best answer that, some information might help us help you better.
What condition are the shoes in, front and rear?
Ditto for the drums, and the wheel cylinders?
How about the master cylinder, is it OK?
Do youhave to pump the brakes to get them to work or work well?
What about the brake hoses? They have a tendency to swell on the inside.
Have you checked all these?
I "unmothballed" my dad's 65 1/2 ton last year. Brakes were hell. Ended up replaceing everying that had rubber or wear surfaces, turned the drums, etc. Several hundred $$ total.
So the brakes were a lot, heck of a lot, better.
BUT!!!!
Here I am a year later, in the midst of a cab off restoration, replacing the master cylinder again, re-doing the brake lines and probably swapping out the front spindles for disc brakes (easier for me, with my ibeam '65 -- sorry).
Moral of the story -- think this through. You almost certainly need some signficant brake work. You may want to go beyond just fixing what you have and consider some upgrades. Minimally, dual chamber master cylinder is a safety upgrade that ought be be strongly considered. Because you'll be re-doing the lines while you are at it, might be a good time to look into front disc brakes. Yada Yada Yada
Good luck and I agree w/banjo as well -- more info may help some folks smarter than I to help you with temporary and permanent solutions that will help.
Look before you leap, and I hope its NOT you daily driver!
Dual chamber MC, 8 inch booster, machined drums, new shoes and rubber hoses, inspect and replace any steel lines that show rust, kinks or dents, rebuild or replace the wheel cylinders. Power drum/drum are acceptable and very economical to maintain. IMHO!
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