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In Reply to: Case W14 1978 posted by John ritchick on Monday, December 19, 2016:
The service brake (Footbrake) works like the brake on a car differ been air is used instead of vacuum,the parking brake works very similar to a truck,the brake actuator is spring loaded to put the brake on should the air pressure drop,when the handbrake is released a charge of air from the reservoir enters the chamber and overcomes the pressure of the springs and the parking brake is released,if you look at the air plumbing there maybe a valve to attach an outside air supply to charge the reservoirs,there is no easy way to release the parking brake should the air pressure be low,look at the parts drawing attached and you'll see a lug nut and a jam nut that is marked with arrows,loosen the jam nut a turn,tighten the lug nut up till the brake is off,have the machine secure so it will not roll over you,usually the threads on the actuator rusts up and it not possible to turn the lug nut the only thing left is to remove the clevis pin,be careful the springs are very strong,do not be tempted to open the actuator as a press is required.
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