Master Cylinder Piston: Diameter 19-25 mm, Weight 50-150 g

Component Specifications

Definition

A precision cylindrical component within a master cylinder that moves under applied force to displace hydraulic fluid, creating pressure for actuating downstream mechanisms like brakes or clutches. It operates within a sealed bore and interfaces with seals to maintain fluid integrity while transmitting force.

Working Principle

The piston translates linear mechanical input (e.g., from a pedal or lever) into hydraulic pressure by compressing fluid in the cylinder bore. This pressure is transmitted through hydraulic lines to actuate slave cylinders or other components, enabling force amplification and remote operation.

Materials

Typically aluminum alloy (e.g., 6061-T6) for lightweight applications, or hardened steel (e.g., AISI 4140) for high-stress environments. May include surface treatments like anodizing or chrome plating for corrosion and wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	50-150 g
Diameter	19-25 mm
Stroke Length	20-40 mm
Surface Finish	Ra 0.4-0.8 μm
Operating Pressure	Up to 20 MPa

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 4925, DIN 74254

Parent Products

This component is used in the following industrial products

Actuation Mechanism (e.g., lever, pedal, hydraulic cylinder)

A mechanical or hydraulic component that converts driver input into force to engage the brake system.

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Engineering Analysis

Risks & Mitigation

Seal failure leading to hydraulic fluid leakage
Corrosion or pitting causing binding
Fatigue cracking under cyclic loads
Contamination causing abrasion and wear

FMEA Triads

Trigger: Seal degradation due to heat or chemical exposure
Failure: Hydraulic fluid leakage and pressure loss
Mitigation: Use compatible seals, regular fluid changes, and temperature monitoring

Trigger: Corrosion from moisture ingress
Failure: Piston binding or seizure
Mitigation: Apply protective coatings, use desiccants in reservoirs, and ensure proper sealing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 mm on diameter, ±0.05 mm on length

Test Method

Pressure cycling test per ISO 4925, leak test with dyed fluid, dimensional verification with CMM

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

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Manufacturers of Master Cylinder Piston

Manufacturer profiles associated with Master Cylinder Piston.

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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 is the primary function of a master cylinder piston?

To convert mechanical force into hydraulic pressure for actuating systems like brakes or clutches.

How does wear affect master cylinder piston performance?

Wear can cause fluid leakage, reduced pressure generation, and increased pedal travel, leading to system failure.

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.

Master Cylinder Piston