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it seems that on my 97 3500 Dually, the rears just lock up like crazy when braking lightly. Is this normal or does it means that something wrong with my brakes?
On my friends truck it is on the left frame rail over the rear axle. ( If it has one) you will have to look at the rear axle to see if there is a linkage going from it up to the valve. To be certain just check does the flex line join straight onto the steel brake line on the frame rail. My brothers 2000 dually does't have the load sensing valve. If there is no valve, maybe it is your master cylinder?