INDUSTRY COMPONENT

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.

Component Specifications

Definition
The brake disc, also known as a rotor, is a critical rotating component in disc brake systems that works in conjunction with brake pads. When hydraulic pressure is applied, the brake pads clamp onto both sides of the disc, creating friction that converts the vehicle's kinetic energy into heat energy, thereby decelerating or stopping the wheel rotation. Modern brake discs feature ventilation channels, slots, or drilled holes to enhance heat dissipation and improve braking performance under various conditions.
Working Principle
The brake disc operates on the principle of friction-based energy conversion. When the brake pedal is depressed, hydraulic pressure forces brake calipers to squeeze brake pads against the rotating disc surfaces. The resulting friction generates heat, dissipating the vehicle's kinetic energy and reducing rotational speed. The disc's rotational motion ensures even wear distribution and consistent braking force application.
Materials
Typically manufactured from cast iron (gray iron, ductile iron), carbon steel, or composite materials. High-performance applications may use carbon-ceramic composites, reinforced aluminum alloys, or surface-treated steels with coatings like zinc, phosphate, or ceramic for corrosion resistance and enhanced thermal properties.
Technical Parameters
  • Weight 5-15kg depending on size
  • Diameter 200-400mm (passenger vehicles)
  • Hardness 180-240 HB (cast iron)
  • Thickness 20-40mm
  • Parallelism 0.01-0.02mm
  • Runout Tolerance 0.05-0.10mm
  • Minimum Thickness Specified by manufacturer (typically 1-2mm less than new)
  • Surface Roughness Ra 1.6-3.2μm
Standards
ISO 15484, ISO 26262, DIN 75078, SAE J431, ECE R90

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Brake Disc/Rotor.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Thermal cracking from overheating
  • Corrosion leading to reduced friction
  • Runout causing vibration/pulsation
  • Premature wear from contaminated surfaces
  • Material fatigue under cyclic stress
FMEA Triads
Trigger: Excessive heat generation during prolonged braking
Failure: Thermal cracking and warping
Mitigation: Use ventilated discs, proper cooling designs, heat-resistant materials, and driver education on braking techniques
Trigger: Corrosive environment exposure
Failure: Surface pitting and reduced friction coefficient
Mitigation: Apply protective coatings, use corrosion-resistant alloys, implement regular inspection protocols
Trigger: Improper installation torque
Failure: Uneven mounting leading to runout and vibration
Mitigation: Follow manufacturer torque specifications, use calibrated tools, implement installation training

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance ±0.5mm, thickness variation ≤0.015mm, runout ≤0.10mm, parallelism ≤0.02mm
Test Method
Dimensional verification with micrometers and dial indicators, hardness testing (Brinell/Rockwell), metallurgical analysis, dynamometer testing for friction performance, salt spray testing for corrosion resistance, thermal cycling tests

Buyer Feedback

★★★★☆ 4.9 / 5.0 (29 reviews)

"Testing the Brake Disc/Rotor now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Motor Vehicle Manufacturing sector, I confirm this Brake Disc/Rotor meets all ISO standards."

Related Components

Isolation Monitor
An automotive BMS component that continuously monitors electrical isolation between high-voltage battery systems and vehicle chassis to prevent electric shock hazards.
Balancing Circuit
Electronic circuit in automotive BMS that equalizes voltage across battery cells to optimize performance and lifespan.
Communication Transceiver
A bidirectional communication transceiver for automotive BMS enabling data exchange between battery cells and control units.
Enclosure
Protective housing for automotive battery management systems ensuring safety, thermal management, and electromagnetic compatibility.

Frequently Asked Questions

How often should brake discs be replaced?

Brake discs typically last 50,000-70,000 miles but require replacement when worn beyond minimum thickness specifications, show severe scoring, cracking, or excessive runout. Always follow manufacturer recommendations and inspect during brake pad changes.

What causes brake disc warping?

Disc warping results from uneven heat distribution during aggressive braking, improper torque during installation, material inconsistencies, or rapid cooling (like driving through water when discs are hot). Proper bedding-in procedures and avoiding extreme thermal stress can prevent warping.

What's the difference between solid and ventilated brake discs?

Solid discs are single-piece designs for lighter vehicles; ventilated discs have internal vanes between friction surfaces to create airflow, significantly improving heat dissipation for heavier vehicles or performance applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Get Quote for Brake Disc/Rotor

Brake Disc (Rotor) Brake Drum/Rotor