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Bleeder Screw Component – Motor Vehicle Manufacturing

Component Specifications

Definition

A specialized threaded fastener designed for brake calipers that provides a controlled opening to purge trapped air from hydraulic brake lines during bleeding procedures. It features a tapered sealing surface and precise thread geometry to maintain system integrity while allowing fluid flow when opened.

Working Principle

The bleeder screw operates on a simple valve principle: when tightened, its tapered tip creates a metal-to-metal seal against the caliper body, preventing fluid leakage. When loosened, it creates a small passage that allows air bubbles to escape while brake fluid flows through, following the principle of hydraulic pressure equalization.

Materials

Typically made from corrosion-resistant steel alloys (such as SAE 1018 or 1045 carbon steel with zinc plating, or stainless steel 304/316), brass, or aluminum alloys. High-performance versions may use titanium or specialized coatings for extreme conditions.

Technical Parameters

Length 15-25mm typical
Head Type Hex socket (Allen), external hex, or slotted
Thread Size M7x1.0, M8x1.0, M10x1.0, or 3/8-24 UNF
Sealing Method Tapered seat (conical) or crush washer
Pressure Rating Withstands up to 2000 psi (138 bar)
Torque Specification 8-15 Nm (6-11 ft-lbs)

Standards

ISO 4032, DIN 934, SAE J429, ISO 898-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bleeder Screw.

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

Thread stripping during installation
Corrosion leading to seizure
Improper sealing causing brake fluid leaks
Shearing during removal if corroded

FMEA Triads

Trigger: Corrosion due to exposure to moisture and road salts
Failure: Screw seizes in caliper, preventing brake bleeding
Mitigation: Use corrosion-resistant materials, apply anti-seize compound, implement regular maintenance schedules

Trigger: Over-torquing during installation
Failure: Thread damage or screw shearing
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, train technicians properly

Trigger: Worn sealing surfaces
Failure: Brake fluid leakage leading to reduced braking performance
Mitigation: Replace screws during brake service, inspect sealing surfaces, use proper replacement parts

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Thread tolerance: 6g per ISO 965-1, dimensional tolerance: ±0.1mm

Test Method

Pressure testing per SAE J1703, corrosion resistance per ASTM B117 salt spray test, torque-to-failure testing

Buyer Feedback

★★★★☆ 4.5 / 5.0 (36 reviews)

"The Bleeder Screw we sourced perfectly fits our Motor Vehicle Manufacturing production line requirements."

"Found 50+ suppliers for Bleeder Screw on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Bleeder Screw is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What happens if a bleeder screw is overtightened?

Overtightening can strip threads in the caliper body, damage the tapered sealing surface, or cause the screw to shear off, requiring caliper replacement.

Can bleeder screws be reused?

While technically reusable, replacement is recommended during brake service as the sealing surfaces degrade over time, increasing risk of fluid leaks.

Why do some bleeder screws have different thread sizes?

Thread sizes vary by vehicle manufacturer, caliper design, and brake system pressure requirements to ensure proper sealing and compatibility.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Bleeder Screw