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Piston(s) Component – Motor Vehicle Manufacturing

Component Specifications

Definition

A cylindrical component within a brake caliper that moves linearly under hydraulic pressure to press brake pads against the rotor, creating friction to decelerate or stop a vehicle. It operates within a sealed bore and is critical for force transmission in disc brake systems.

Working Principle

Operates on Pascal's principle: hydraulic pressure applied to brake fluid creates equal pressure throughout the system, forcing the piston outward against the brake pad. When pressure is released, seals retract the piston slightly to prevent drag.

Materials

Typically forged or machined from aluminum alloys (A356, 6061-T6) for lightweight applications, or steel (4140, 1045) for heavy-duty use. Surface treatments include hard anodizing (25-50μm), nickel plating, or DLC coatings for wear resistance.

Technical Parameters

Stroke 1-3mm
Diameter 30-60mm (passenger vehicles), 70-120mm (commercial)
Hardness 80-90 HRB (aluminum), 25-35 HRC (steel)
Surface Finish Ra 0.4-0.8μm
Temperature Range -40°C to +200°C
Operating Pressure 80-120 bar

Standards

ISO 15484, DIN 74324, SAE J431, JIS D 2601

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Piston(s).

Parent Products

This component is used in the following industrial products

Brake Caliper

A hydraulic or mechanical device that applies clamping force to brake pads against a rotor to slow or stop a vehicle.

View Product Details

Engineering Analysis

Risks & Mitigation

Hydraulic fluid leakage
Piston seizure due to corrosion
Overheating leading to brake fade
Seal failure causing pressure loss

FMEA Triads

Trigger: Corrosion from road salt/moisture
Failure: Piston sticks in bore, uneven braking
Mitigation: Protective coatings, regular cleaning, sealed dust boots

Trigger: Excessive heat from aggressive braking
Failure: Piston material degradation, seal hardening
Mitigation: High-temp materials, cooling fins, proper pad selection

Trigger: Contaminated brake fluid
Failure: Seal swelling/ deterioration, corrosion
Mitigation: Regular fluid changes, sealed systems

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Diameter: ±0.02mm, Roundness: 0.01mm, Surface finish: Ra 0.4-0.8μm

Test Method

Pressure testing at 150% operating pressure, cycle fatigue testing (100k cycles), salt spray corrosion testing per ISO 9227

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes brake piston sticking?

Corrosion from moisture ingress, contaminated brake fluid, seal degradation, or lack of lubrication on sliding surfaces. Regular maintenance and fluid changes prevent this.

Can pistons be replaced individually?

Yes, but typically replaced as a caliper rebuild kit including seals and dust boots. Matching piston material and dimensions to original specifications is critical.

How do floating vs fixed caliper pistons differ?

Floating calipers have pistons on one side only and slide laterally; fixed calipers have pistons on both sides and don't move. Both use similar piston principles.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Piston(s)