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During normal vehicle operation, the braking system continuously performs the tasks of deceleration and stopping. Although drum brakes are not as widely used as disc brakes, they are still extensively employed in many rear-wheel systems and heavy-duty vehicles. The issue of drum wear must be effectively addressed through brake drum resurfacing to ensure driving safety and braking performance.
Brake drum resurfacing refers to the process of mechanically removing grooves, rust, and irregular wear from the inner surface of the brake drum using equipment such as a Disc Drum Lathe, thereby restoring its original roundness and smoothness.
Application Scope:
Drum brake systems (primarily found on older vehicles, trucks, or certain economy-class vehicles’ rear wheels).
Scenarios where braking performance has deteriorated but the drum body has not suffered severe cracking or damage.
Primary Purpose of Repair:
Restore braking contact area (≥90%) to enhance braking efficiency.
Eliminate brake shuddering and abnormal noises caused by uneven wear and concentricity deviations.
Avoid brake drum replacement due to delayed maintenance, thereby reducing brake maintenance costs.
Brake drums may experience wear, grooves, and thermal deformation over time. If not addressed promptly, this may lead to the following risks:
Safety Hazards
Imbalances in drum roundness can cause unstable braking and increase braking distance.
Asymmetrical braking may cause the vehicle to veer off course or even skid.
Increased Costs
If wear exceeds the repairable range, the entire brake drum must be replaced, resulting in repair costs 3–5 times higher.
The entire drum brake repair process can be divided into four main steps, which require the use of specialized equipment such as a Disc Drum Lathe for processing:
Step 1: Disassembly and Initial Inspection
Remove the brake drum and thoroughly clean it.
Use calipers or specialized instruments to measure wear depth and concentricity.
Step 2: Rough Machining (Expanding or Rough Grinding)
Use a lathe for preliminary machining to remove severe grooves or uneven surface areas.
Step 3: Fine Grinding
Multi-stage grinding: Use grinding wheels of different grit sizes (e.g., 46#, 36#, 30#) to grind in both directions for 5 minutes each.
Final polishing: Use fine sand (e.g., river sand) for surface finishing.
Step 4: Reassembly and Testing
Clean and reassemble the brake drum, adjust the brake shoe clearance, and ensure the contact area meets standards.
Is it suitable for DIY operation?
Not recommended. Brake drum repair requires the use of high-precision CNC equipment (such as a dedicated Brake Disc/Drum Lathe) and professional measuring tools. It is recommended to have it done by a certified repair shop.
Are there any limits to repair?
Yes. Each brake drum has a maximum processing limit.Once this limit is exceeded, replacement is mandatory.
Are there any alternative solutions?
If the brake drum has cracks, excessive deformation, or has reached its wear limit, it should be replaced with a new one.
Brake drum repair is not an optional procedure but a necessary step to extend the lifespan of the braking system and ensure driving safety. Professional repair equipment and experienced technicians are prerequisites for high-quality brake drum repair.
For further information on drum brake system maintenance, brake repair equipment selection (such as Disc Drum Lathes), or to obtain quotes and service recommendations, please contact our technical team.
Tags: Brake Drum
