I have an 08 Procraft with a Trailstar trailer. It is a dual axle trailer with brakes on the back axle. All hubs are clear. The front 2 are nice and dark, the back 2 are gray(water in the oil.) What is done to fix: change seals? What is involved in changing seals? Do the brakes cause any problems with fixing this problem??
Front Hub
Rear Hub
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