What happens when oil or grease gets onto the lining material of a brake shoe?
Believe you me, nothing will remove oil or grease contamination entirely from a brake shoe. In the old days of riveted linings, I even used to heat the shoes and burn oil out. It never really worked100 %. Exchange bonded shoes are not expensive. Replace them. Only one point, MAKE SURE YOU REPAIR THE SOURCE OF THE CONTAMINATION FIRST!! Primary shoes are either longer linings, or of a different material to the trailing shoe. If so, one will be marked primary. The leading shoe is the one that, in the direction of forward rotation of the brake drum, is the first shoe that a mark on the brake drum would reach AFTER PASSING the brake cylinder. The other TRAILS from the pivot point opposite. If you have a front and rear brake shoe, the wheel cylinder will be top or bottom. Given the definition of “leading shoe” above, it could be either front OR back. Should the brake have 2 separate brake cylinders, it will have 2 leading shoes. No trailer.
when oil or grease gets on the shoes then it will glaze the shoes. take the drum off and take sandpaper and take the glaze off them. the difference in brake linings, it,s B. you have a long shoe which goes on the back and a short shoe which goes on the front.of course it depends on what car you have. some brake shoes, the length of both shoes are the same size. you could try some brake cleaner to get the glaze off.
