Brake Caliper and Pads: Specifications and Selection Guide

Product Specifications

Technical details and manufacturing context for Brake Caliper/Pads

Definition

A brake caliper and brake pads form a critical safety component within a vehicle's braking system. The caliper assembly consists of a housing, pistons, and mounting hardware, while the brake pads are friction materials bonded to steel backing plates. The caliper straddles the brake rotor and uses hydraulic pressure to squeeze the pads against both sides of the rotor, creating friction that converts kinetic energy into heat, thereby decelerating the wheel. This component is essential for controlled stopping and is subject to stringent safety requirements.

Typical caliper housings are made of cast iron or aluminum, while brake pads use semi-metallic, ceramic, or organic compound friction materials. Steel is used for backing plates, pistons, and hardware. Key parameters include clamping force (15–60 kN), brake disc diameter (250–400 mm), friction coefficient (0.35–0.45 per ISO 15484), maximum operating temperature (350–500 °C), pad thickness (10–20 mm), piston diameter (30–60 mm), weight (1.5–4.0 kg), material grade (GG25–GG40 per DIN 1691), and surface treatment (Zinc–Nickel per ASTM B841). These values are reference ranges and must be verified for the specific vehicle model and application.

When selecting or replacing brake calipers and pads, confirm compatibility with the vehicle's brake system, including rotor size, hydraulic pressure, and pad dimensions. Verify that the components meet relevant standards and are suitable for the intended driving conditions. Regular inspection is necessary: check pad thickness for wear (wear limit typically 2 mm), monitor for brake fade at high temperatures, and ensure the caliper operates smoothly without leaks. Failure to maintain these components can lead to reduced braking performance or complete brake failure, posing serious safety risks. Always consult the legal manufacturer or supplier for model-specific specifications and compliance documentation.

Working Principle

Hydraulic pressure from the master cylinder forces pistons within the caliper to move outward, pressing the brake pads against both sides of the rotating brake rotor. The resulting friction converts the vehicle's kinetic energy into heat, which is dissipated through the rotor and pads, thereby slowing or stopping the vehicle. The clamping force generated by the hydraulic system determines the braking torque, and the friction coefficient of the pad material influences the deceleration rate. Proper heat dissipation prevents brake fade, ensuring consistent performance under repeated braking.

Common Materials

Cast iron or aluminum (caliper), Semi-metallic, ceramic, or organic compound friction material (pads), Steel (backing plates, pistons, hardware)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Clamping Force	15–60 kN	Determines braking torque
Brake Disc Diameter	250–400 mm	Must match vehicle wheel size
Friction Coefficient	0.35–0.45	Lower values reduce braking performanceISO 15484
Max Operating Temperature	350–500 °C	Exceeding may cause brake fade
Pad Thickness	10–20 mm	Wear limit is typically 2 mm
Piston Diameter	30–60 mm	Affects clamping force distribution
Weight	1.5–4.0 kg	Unsprung mass affects handling
Material Grade	GG25–GG40	Cast iron for caliper housingDIN 1691
Surface Treatment	Zinc–Nickel	Corrosion protectionASTM B841

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

Components / BOM

Caliper Housing Part
Main body that houses pistons and mounts to the vehicle suspension/axle

Material: Cast iron or aluminum
Brake Piston(s) Part
Hydraulically actuated component that presses the brake pad against the rotor

Material: Steel or phenolic resin
Brake Pad (Friction Material) Part
Creates friction against the rotor to generate stopping force

Material: Semi-metallic, ceramic, or organic compound
Brake Pad Backing Plate Part
Steel plate that supports the friction material and transfers force from the piston

Material: Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Brake/Locking Mechanism

View system integration details

Manufacturers of Brake Caliper/Pads

Manufacturer profiles associated with Brake Caliper/Pads.

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Frequently Asked Questions

What is the typical operating pressure range for brake calipers?

However, the exact value depends on the vehicle's braking system and must be confirmed with the manufacturer.

How do I know when brake pads need replacement?

Brake pads have a wear limit, typically 2 mm of remaining thickness. Inspect pads regularly; if the friction material is worn to this limit or less, replace them to maintain braking performance and safety.

What materials are commonly used for brake calipers and pads?

Caliper housings are typically cast iron or aluminum. Brake pads use semi-metallic, ceramic, or organic friction compounds, with steel backing plates. Material grades for cast iron may be GG25–GG40 per DIN 1691.

Why is the friction coefficient important?

The friction coefficient (typically 0.35–0.45 per ISO 15484) determines the braking force generated for a given clamping pressure. Lower values reduce braking performance, so it is critical to use pads with the correct coefficient for your vehicle.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 200 bar hydraulic line pressure
other spec:	Flow rate: 0.5-2.0 L/min per caliper, pad wear limit: 80% thickness reduction
temperature:	-40°C to 300°C (continuous), peak 600°C (transient)

Brake Caliper/Pads

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards