How Often Should Rear Drum Brake Pads Be Replaced?

[VanCassandra]

Drum brakes generally need to be replaced after the vehicle has traveled approximately 100,000 kilometers. How to Determine If Brake Pads Need Replacement: Check the Brake Pad Thickness: When brake pads become very thin, braking performance significantly declines, affecting driving safety. New brake pads are typically around 1.5 cm thick. When the thickness wears down to 0.5 cm, increase the frequency of self-inspection. Once the brake pads wear down to only 0.3 cm, they must be replaced immediately. This is the minimum thickness limit for replacement—do not delay, as it can lead to accidents. Dashboard Warning Light: Most car dashboards have a brake warning light. When this light illuminates, it indicates that the brake pads need inspection. However, if the light is on, it means the pads have reached their wear limit and must be checked immediately. All vehicles have this warning system, but some directly sense the brake pad thickness, while others activate the warning light only after the pads are completely worn and the brake fluid level drops critically. Listen for Sounds: Brake discs are mostly made of iron and can rust after prolonged parking, especially in damp weather. When braking, a slight hissing sound may occur, which usually disappears after driving for a while and applying the brakes a few times. If the sound persists, the brake pads must be replaced immediately. This indicates that the wear indicators on the pads are directly scraping the brake disc, meaning the pads are beyond their limit. In such cases, inspect the brake disc as well, as it may already be damaged. Simply replacing the brake pads may not eliminate the noise, and in severe cases, the brake disc may also need replacement. Brake Response and Pedal Travel: As brake pads wear thin, the car's braking response becomes slower. You may need to press the brake pedal deeper and harder to achieve the same braking effect as before. If you notice that the braking effect weakens in the first half of pedal travel, or the brakes feel soft and less effective, it's time to check if the brake pads need replacement.

[IvanRose]

The replacement interval for rear drum brake pads mainly depends on actual wear conditions, with no fixed schedule. I usually drive quite smoothly, rarely brake hard, and haven't replaced them even after nearly 80,000 kilometers. But my friend who loves racing on mountain roads replaced them at just 40,000 kilometers. It's recommended to have a mechanic use professional tools to inspect them during maintenance. New brake pads are typically about 12mm thick, and must be replaced when worn down to below 5mm. Drum brakes have a sealed structure, making self-inspection difficult. If you notice longer brake pedal travel or hear metal grinding sounds, immediate action is required. Safety first - when replacing, remember to clean out accumulated dust inside the brake drum.

[DiBrooklyn]

My old car's rear drum brakes lasted 7 years before needing their first pad replacement, mainly depending on driving habits. Friends who mostly drive on highways might get 100,000 km out of them, while those stuck in city traffic with frequent stops may need replacements at 50,000 km. Here's a tip: Have the service center check the pad thickness during each maintenance, and inspect the brake springs and wheel cylinders for leaks. Increased stopping distance or a soft pedal are also warning signs. When replacing pads, remember to change both on the same axle to avoid uneven wear. Always choose OEM or reputable brand parts - I once bought cheap aftermarket pads that started squeaking after just 20,000 km.

[McBrianna]

There's no universal standard for replacing rear drum brake pads; it depends on driving conditions. For daily commuting like mine, I checked at 70,000 km and found only 4mm thickness left, so I replaced them immediately. Note that brake dust buildup can cause overheating—after long descents, test the wheel hub temperature with the back of your hand to ensure it's not scalding. It's recommended to inspect every 30,000 km. Excessively worn pads can also scratch the brake drum, leading to costlier repairs. When choosing pads, check the friction coefficient—low-temperature variants are more stable in winter. Reminder: New pads need a 200-km break-in period; avoid hard braking to prevent reduced lifespan.

[MacReagan]

Based on repair shop experience, rear drum brake shoes typically need replacement every 60,000-80,000 km, but actual wear varies significantly. I've seen delivery vans wear them out by 20,000 km, while highway commuter cars can last over 120,000 km. Watch for three key warning signs: metallic scraping from the rear during braking indicates the wear limiter is contacting; noticeable vehicle pulling during emergency stops; and suddenly increased stopping distances in wet weather. Professional installation is recommended - drum brakes contain multiple springs that are easy to misassemble during DIY. Some ceramic compound brake shoes now offer extended lifespan (though about 30% more expensive) with reduced dust generation.