How adjust manual air brakes?

to manually adjust airbrakes,you will need a 9/16 bo wrench

with full air in truck, wheels chocked, and park brakes released.jack wheel off ground.

get underneath truck. on each wheel there is an adjuster, connecting "S" cam to air cannister on axle housing.on this adjuster there is a 9/16 nut with a ring around it. place box wrench over the nut, and push wrench so the ring goes in allowing proper purchase of wrench on nut.

sometimes, if full of dirt, etc, u may need to tap wrench with a hammer to free it up .this ring is actually a lock ring which stops nut from moving ,and is spring loaded so will pop back out when pressure released

now with ring pushed in, turn the nut till the brakes are seated against the brake drums. then back the nut off until u can just turn the wheel without brake binding it up.remove wrench from nut and ring should pop back out

if dirt prevents this tap lightly with a hammer or jiggle nut till it pops out ove r nut

to do this without jacking wheel off ground, same instructions, except when brakes adjusted against drums, back off nut about 1/2 to one turn. what ever amout nut is backed off on one wheel, should be done on all wheels to ensure equal adjustment on all wheels