Posted by John B. on October 28, 2016 at 18:24:02 from (50.44.107.217):
In Reply to: IH 400 brake grabes posted by M-Snyder on October 28, 2016 at 13:56:22:
The brakes self energize. That's why it locks up so fast with little pressure on the pedal. I would put new springs on it that has helped all the ones I ever worked on with that problem. Also if there is any endplay on the shaft that will add to your problem.
Drum brakes on cars and trucks will do the same thing if springs are broke or weak. Springs are the only thing keeping it from going too far and locking up. Those springs get hot in there and loose their tensile strength. To me it's a poor design but works good when all parts are in good working order. On road vehicles drum brakes are specially designed to self energize in a forward motion by having the rear shoe lining longer than the front shoe lining. Disc brake rely on the caliper seal to pull the piston back several thousands of an inch to take pressure off the pads once your foot is off the brake pedal.
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