Depending on where the leak is, the wheel bearing seal at the inner bearing will cause the lube to infiltrate the brake drum. If it is only leaking at the outer end of the axle shaft then it wouldn't damage the brakes and is an easy and inexpensive repair.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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