Caliper Housing: Bore Diameter 30-60 mm, Weight 1.5-4.5 kg

Component Specifications

Definition

The caliper housing is a precision-engineered component in disc brake systems that serves as the primary structural and functional unit. It mounts over the brake rotor and contains pistons, brake pads, and hydraulic fluid channels. When hydraulic pressure is applied from the master cylinder, pistons within the housing move outward, pressing brake pads against the rotor to create friction and decelerate the vehicle. The housing must withstand extreme mechanical stresses, thermal expansion from braking heat, and corrosive environmental conditions while maintaining dimensional stability and sealing integrity.

Working Principle

The caliper housing operates on hydraulic and mechanical principles. Hydraulic fluid pressure from the brake system actuates pistons inside the housing, which transfer force to brake pads. The housing converts this hydraulic energy into linear mechanical motion, clamping brake pads against the rotating rotor to generate friction and kinetic energy conversion into heat, thereby stopping the vehicle.

Materials

Typically made from cast iron (gray or ductile), aluminum alloys (A356-T6 for lightweight applications), or occasionally forged steel. Materials must have high tensile strength (200-350 MPa), good thermal conductivity, corrosion resistance, and dimensional stability under thermal cycling. Aluminum housings often include silicon content (6.5-7.5%) for improved casting properties and wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	1.5-4.5 kg
Bore Diameter	30-60 mm
Mounting Type	Fixed or Floating
Surface Finish	Ra 1.6-3.2 μm
Pressure Rating	Up to 200 bar
Casting Tolerance	±0.5 mm
Piston Configuration	Single, Dual, or Multi-piston
Operating Temperature	-40°C to 300°C

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 74252, SAE J431, ISO 26262

Parent Products

This component is used in the following industrial products

Brake Caliper/Pads

Hydraulic clamping device and friction material that converts kinetic energy to thermal energy to slow or stop vehicle motion.

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Engineering Analysis

Risks & Mitigation

Cracking from thermal stress
Corrosion leading to piston seizure
Fluid leakage from seal failure
Mounting bolt fatigue failure
Incompatible material expansion

FMEA Triads

Trigger: Thermal cycling during braking
Failure: Housing cracks develop, leading to hydraulic fluid leakage
Mitigation: Use materials with proper thermal expansion coefficients, implement stress-relief heat treatments, and design with adequate wall thickness and reinforcement ribs

Trigger: Corrosive road salt and moisture exposure
Failure: Piston bore corrosion causes sticking pistons and uneven braking
Mitigation: Apply corrosion-resistant coatings (e.g., powder coating, anodizing for aluminum), use stainless steel pistons, and ensure proper sealing

Trigger: Improper installation or over-torquing
Failure: Mounting ear fractures or thread damage compromising structural integrity
Mitigation: Specify precise torque values (typically 70-120 Nm), use thread locking compounds, and provide clear installation guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m, bore roundness within 0.01 mm, parallelism within 0.02 mm

Test Method

Pressure testing at 1.5x operating pressure, thermal cycling tests (-40°C to 300°C), salt spray corrosion testing per ASTM B117, fatigue testing with cyclic loading

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Caliper Housing

Manufacturer profiles associated with Caliper Housing.

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Brake Disc (Rotor)

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

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Frequently Asked Questions

What is the difference between fixed and floating caliper housings?

Fixed caliper housings have pistons on both sides of the rotor and remain stationary, providing even pressure distribution and better performance. Floating caliper housings have pistons on only one side and slide on pins or bushings, making them simpler and more cost-effective for most passenger vehicles.

How often should caliper housings be inspected?

Caliper housings should be inspected during every brake service (typically every 20,000-40,000 miles) for cracks, corrosion, piston sticking, and fluid leaks. Complete visual and functional inspections are recommended annually or whenever brake performance issues are noticed.

Can aluminum caliper housings replace cast iron ones?

Yes, aluminum housings are increasingly used for weight reduction and better heat dissipation, but they require different manufacturing processes and may have different thermal expansion characteristics. Direct replacement depends on specific vehicle design and compatibility with existing brake systems.

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.

Caliper Housing