Just because you don't see fluid on the backing plates
don't think for a second that the wheel cylinders might not be the problem.
Excess brake dust can absorb the fluid leaving a slimy mess and fool you
into thinking that everything is honky dory inside the drum.....
Pull the drums and visually inspect before ruling out the wheel cylinders as
Master cylinders USUALLY leak out the back around the piston shaft seal,
fluid can usually be spotted running down the brake booster where the master
cylinder is bolted in place
Have fun with the brakes
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