Brake Drum/Rotor: Thickness 10-30mm, Weight 5-25kg

Component Specifications

Definition

The brake drum or rotor is a critical rotating component in automotive and industrial braking systems. In drum brake configurations, it's a cylindrical component where brake shoes press outward against its inner surface. In disc brake systems, the rotor is a flat, circular metal disc that rotates with the wheel, with brake pads clamping on both sides. Both designs function by converting kinetic energy into thermal energy through friction, enabling controlled deceleration and stopping of vehicles or machinery.

Working Principle

Works on the principle of friction-based energy conversion. When brake pads or shoes apply pressure against the rotating drum or rotor, friction forces create resistance that converts the vehicle's kinetic energy into thermal energy, dissipating heat into the atmosphere and causing deceleration.

Materials

Typically made from cast iron (gray iron or ductile iron) for its excellent thermal conductivity and wear resistance. High-performance applications may use carbon-ceramic composites, reinforced aluminum alloys, or ventilated designs with internal vanes for improved heat dissipation.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	5-25kg
Diameter	200-400mm (passenger vehicles), up to 600mm (heavy-duty)
Thickness	10-30mm
Parallelism	0.02mm
Runout Tolerance	0.05-0.10mm
Surface Hardness	180-240 HB
Maximum Operating Temperature	500-700°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 15484, DIN 74281, SAE J431, GB/T 5334

Parent Products

This component is used in the following industrial products

Brake/Drag Unit

A mechanical or electromechanical device that applies controlled resistance to regulate tension in material processing systems.

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Engineering Analysis

Risks & Mitigation

Thermal cracking from overheating
Warping causing vibration
Excessive wear leading to reduced braking efficiency
Corrosion in humid environments
Fatigue failure from cyclic loading

FMEA Triads

Trigger: Excessive heat generation during prolonged braking
Failure: Thermal cracking and warping
Mitigation: Use ventilated designs, proper material selection, and implement cooling fins or slots

Trigger: Corrosive environments or road salt exposure
Failure: Surface corrosion reducing friction efficiency
Mitigation: Apply protective coatings, use corrosion-resistant alloys, regular inspection

Trigger: Improper installation or uneven torque
Failure: Uneven wear and vibration
Mitigation: Follow manufacturer torque specifications, use proper installation procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm for thickness variation, ±0.10mm for runout, surface finish Ra 1.6-3.2μm

Test Method

Dynamometer testing for fade resistance, thermal imaging for heat distribution, hardness testing, dimensional verification with CMM

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Brake Drum/Rotor

Manufacturer profiles associated with Brake Drum/Rotor.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Brake Disc (Rotor)

A rotating disc in disc brake systems that creates friction with brake pads to slow or stop vehicle motion.

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Surround

Structural component that encloses and protects suspension system elements while providing mounting points and structural integrity.

Brake Disc/Rotor

A rotating disc component in disc brake systems that converts kinetic energy into thermal energy through friction to slow or stop vehicle motion.

Frequently Asked Questions

What's the difference between brake drums and rotors?

Brake drums are cylindrical components used in drum brake systems where brake shoes press outward. Rotors are flat discs used in disc brake systems where pads clamp on both sides. Disc brakes generally offer better heat dissipation and performance.

How often should brake drums/rotors be replaced?

Typically every 50,000-70,000 miles, but depends on driving conditions, vehicle weight, and braking habits. Replace when thickness falls below minimum specifications or when scoring/cracking occurs.

What causes brake rotor warping?

Uneven heat distribution during braking, improper torque during installation, or rapid cooling (like driving through water when hot) can cause thermal stress leading to warping.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Brake Drum/Rotor