Product Introduction

The 3874210001 Brake Drum is one of the most critical braking components used on Mercedes-Benz SK, MK, NG series, and Beiben NG80 heavy-duty trucks.

The brake drum is mounted directly onto the wheel hub and rotates together with the wheel. During braking, the brake shoes expand outward against the inner braking surface of the drum, generating friction that converts vehicle kinetic energy into heat, slowing and stopping the vehicle safely.

The brake drum works together with:

• Brake shoes
• Brake lining
• Brake chamber
• Slack adjuster
• S-cam shaft
• Wheel hub
• Wheel bearings

Its primary functions include:

• Providing stable braking torque
• Dissipating braking heat efficiently
• Supporting heavy vehicle braking loads
• Maintaining braking stability
• Extending brake lining service life

Heavy-duty trucks frequently operate under full-load conditions, steep gradients, and long-distance transportation, placing significant thermal and mechanical stress on the brake drum. Inferior brake drums may lead to:

• Brake fade
• Excessive wear
• Cracking due to overheating
• Brake vibration
• Reduced braking efficiency
• Increased maintenance costs

The 3874210001 brake drum is manufactured using premium HT250/HT300 high-strength cast iron with precision balancing and CNC machining. The optimized internal structure improves heat dissipation while maintaining excellent dimensional stability under repeated braking cycles.

Designed according to OEM specifications, this brake drum provides direct replacement compatibility for Mercedes-Benz SK, MK, NG, and Beiben NG80 drum brake systems. It is widely used for fleet maintenance, brake system overhaul, commercial truck repair, and heavy-duty transportation applications.

Every brake drum undergoes strict quality inspections including:

• Dynamic balancing
• Hardness testing
• Braking surface inspection
• Dimensional accuracy verification
• Crack detection
• Installation fitment testing

to ensure OEM-level safety, reliability, and long service life.

Technical Specifications

Vehicle Fitment

Payment & Shipping

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