The oil serves a purpose
The oil serves a purpose to prevent the brake band from rusting. Keeping the lining and band well soaked in oil or gear lub prevent failure due to rust.
But all kidding aside the, the point is if the brake is correctly adjusted and never has to be applied to stop the vehicle instead of or in aid of the regular brakes it should not wear out. They due seem to get oil soaked and if you ever drive off with the brake partially engaged it will eventually let you know it or the cars behind you will when smoke starts rolling from under the truck.
I too have done a sudden stop on the side of the road diving from the cab with fire extinguisher in hand, after seeing smoke in the rear mirrors. Looking under the truck in the smoke to hear that sizzling sound like some one cooking bacon.
No flames, so I chocked the wheels released the hand brake and sat there until the whole mess was cooled down.
Cheers Phil
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