Piston(s): Temperature Range -40°C to +200°C, Stroke 1-3mm

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

Parameter	Typical range	Notes & selection driver
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

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 74324, SAE J431, JIS D 2601

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.

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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

Typical Suppliers & Equivalents

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

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 Piston(s)

Manufacturer profiles associated with Piston(s).

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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

Clutch Disc

A clutch disc is a friction component in clutch-brake systems that engages and disengages power transmission between rotating shafts.

Synchronizers

Synchronizers are precision components in manual transmissions that enable smooth gear shifting by equalizing rotational speeds between gears and shafts.

Brake Disc (Rotor)

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

Main Bearing Journals

Main bearing journals are precision-machined cylindrical surfaces on a crankshaft that rotate within main bearings to support rotational motion in internal combustion engines.

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.

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.

Piston(s)