how often should brake drums be replaced
The only way to be sure of the condition of drum brakes is to regularly pull the drums and check the lining thickness. It should be more than 1/8 above the rivets on riveted linings, and 1/8 above the metal on bonded linings. If the linings are soaked with brake fluid, the shoes should be replaced at the same time the leak is repaired. It is usually recommended that brakes be inspected at least every 10,000 miles. However, rear drum brakes normally last about twice as long as front disc brakes. If you know when the rear brakes were last checked, you can get by with inspecting them every other time you inspect the front brakes.