Toyota trucks including Tacoma, T100 and Tundra with rear drum brakes use a bellcrank apparatus through the brake backing plate as part of the parking brake system. These bellcranks, made of aluminum and steel are known for seizing up…..The sagging cable that runs across the differential is a warning. If you notice this you need to check the action of the bellcranks before using theparking brake further. Using the parking brake with this condition can cause damage to the brake shoes and drum. You can check the action of the bellcrank manually to verify the bellcrank is seized. It should move freely. Even if the cable is just too tight you should be able to pull the cable towards the side that is not against the backing plate, while pulling the other side off. If you find you can get no movement from the bellcrank, its time to pull the drums and get to work. RemovingToyota Drums If you have never removed your drums, you will likely find that they are stuck in place. Rust tends to build up between the drum and hub flange making them difficult to remove. Here are some tips for removing the drum as shown in figure 3. Using sandpaper, remove as much rust as possible on the flange that is exposed on the out side of the drum. Soak the drum at the hub with penetrating oil. Be sure to spray some in the holes between the studs. Removing the Bellcrank: Once the drum has been removed inspect the brake shoes for wear and cracking of the shoe material from excessive heat. If this is found, the shoes should be replaced. If heat damage is found on the shoes, inspect the brake drum surface for scoring or hot spots. If this is found the drum may need replaced also.
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