The main cause of overheating brake drum:
1, the left and right brake drum and brake pad clearance is not consistent;
2, the left and right tire pressure is not consistent;
3. The left and right brake pipeline is blocked, resulting in different hydraulic pressure or air pressure on both sides;
4. Brake shoe return spring is broken or too soft;
5, pump piston rice card, slow return;
6, (oil brake) brake fluid oil return slow;
7, (air brake) brake camshaft does not return;
8, support pin rust;
9. The brake drum is out of circle;
10, the hub bearing adjustment is too tight;
11, gear oil is insufficient or too much, gear oil viscosity is too small.
Please try to choose a better road conditions, avoid braking and frequent brake, fill the prescribed type of gear oil, and pay attention to the amount of filling, bearing clearance to the service station to adjust.