INDUSTRY COMPONENT

Piston(s)

Hydraulic piston that converts fluid pressure into mechanical force in brake calipers

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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).

brake piston caliper piston hydraulic piston disc brake component automotive braking piston seal brake system Piston(s) Piston(s) in Motor Vehicle Manufacturing

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

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

Buyer Feedback

★★★★☆ 4.9 / 5.0 (29 reviews)

"Reliable performance in harsh Motor Vehicle Manufacturing environments. No issues with the Piston(s) so far."

"Testing the Piston(s) 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."

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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.

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Piston Seals Post Body