How to Solve Overheating Rear Drum Brakes?

[AndresLee]

Solutions for overheating rear drum brakes: Overheating occurs due to poor retraction of the brake caliper, which can be addressed by adjusting the angle of the brake pads. It is normal for rear drum brakes to heat up during driving. Although the brake discs and pads are connected to the wheel hub after installation, they do not transfer all the heat to the tires. During vehicle braking, more force is applied to the front wheels, which is why front brake discs are usually disc brakes. To improve heat dissipation, many vehicles use ventilated discs. The advantage of drum brakes lies in their structural design. When engaged, the expansion of the brake pads generates additional torque, enhancing braking force. Therefore, drum brakes are commonly used in heavy-duty vehicles.

[Hector]

Last time I encountered this issue, I found that overheating drum brakes are mostly caused by incomplete brake release. It could be that the brake shoes are stuck in the drum and can't retract, or the handbrake cable is rusted and pulled too tight. Once when I was repairing my car, I opened the rear drum and saw it was full of iron powder from worn brake shoes - had to use an air gun to blow it all clean. Daily maintenance should include listening for scraping sounds when the wheels rotate, and avoiding continuous braking on long downhill slopes - using intermittent braking is safer. For older vehicles, there's an 80% chance you'll need to replace the brake shoes and return springs. This job is best left to professional mechanics, as DIY disassembly often leads to reassembly difficulties.

[VonBraxton]

My car also had the issue of the wheel hub being too hot to touch before, which could potentially cause bigger problems in no time. The key is to check if the gap between the brake pads and the drum is too small. Some cheap brake pads have poor heat dissipation and can easily overheat and seize after a few continuous brakes. Also, check if the brake fluid lines are deformed, affecting the return of oil. Aging brake fluid can also cause the wheel cylinder piston to seize. Don’t just focus on changing the engine oil during maintenance—remember to have the mechanic test the handbrake force. Last time, I spent over 200 yuan to replace new brake shoes, and the mechanic also smoothed out the grooves on the drum surface. It’s fine for short trips, but if you notice this issue before a long journey, it’s better to get it fixed immediately for safety.

[SanRiley]

Overheated drum brakes can be quite dangerous. I've found there are mainly three causes: first, the handbrake cable is adjusted too tight and not fully released; second, mud and water get into the drum brake during rainy days, causing the brake shoes to stick; third, bearing wear leads to misaligned drum brakes causing excessive friction. A simple solution is to find an open space, release the handbrake, and push the car to see if the wheels rotate freely. If they're stuck, try tapping the brake drum first - with some luck, the vibration might loosen it. But if you smell burning while driving, you must stop immediately and wait until the wheels cool down completely before moving again. It's best to carry a fire extinguisher as backup, as this kind of overheating could ignite brake dust.

[LeReese]

Last time when I opened up the rear wheels during car repair, I noticed several common scenarios with overheated drum brakes: either the brake shoes were oil-contaminated causing sticking, or the positioning springs rusted and lost elasticity. During servicing, it's necessary to disassemble to clean carbon deposits, then use a micrometer to measure the clearance - 0.5mm is ideal, as excessive tightness leads to overheating. For vehicles with modified large rims, installing cooling fins is recommended. Additionally, abnormal brake return could be due to torn dust boots allowing water ingress and rusting - in such cases, merely replacing the shoes without renewing the entire kit won't fundamentally solve the problem.