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:p Ok- You got me.
If you have drum brakes all the way around, and no warning light on your dash,. you can chuck the brake warning light switch.
Drum brake trucks do not need a proportioning valve.
This is because the extra braking power the front brakes need is accomplished
by another method. On drum brake trucks, the front wheel [brake] cylinder pistons are larger diameter than the ones on the rear brakes.
--Regards, Bruce
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