079-00300 - Cleveland Wheels and Brakes Bleeder Screw

079-00300 – Cleveland Wheels and Brakes Bleeder Screw

Available now on the Airparts.aero Marketplace.

Overview

The Cleveland 079-00300 is a genuine Original Equipment Manufacturer (OEM) bleeder screw, a precision-machined valve essential for the proper maintenance and safety of Cleveland hydraulic brake systems. This component is installed in brake master cylinders and calipers, providing the sole designated port for purging trapped air from the hydraulic lines. Fabricated from high-strength, cadmium-plated steel, the 079-00300 is engineered with a precisely tapered seat to ensure a perfect, leak-proof metal-to-metal seal when closed, while allowing for controlled fluid and air expulsion during the bleeding process.

Key Features

• Precision Tapered Seat: The most critical feature is the precisely machined taper at the base of the threads. When tightened to the specified torque, this tapered seat engages with a corresponding flare inside the component's bleed port, creating a robust, high-pressure seal that prevents fluid leaks and air ingress.
• Internal Bleed Orifice: Features a small, centrally drilled orifice that runs the length of the screw. When the screw is slightly loosened, this orifice provides a controlled path for pressurized hydraulic fluid and trapped air bubbles to be expelled from the system.
• High-Strength Steel Construction: Manufactured from a high-quality steel alloy to withstand the repeated torquing cycles required during maintenance without thread stripping or failure. It is strong enough to resist shearing even if over-torqued.
• Corrosion-Resistant Plating: Plated with a durable cadmium finish. This protective coating provides essential corrosion protection against hydraulic fluid, moisture, and other environmental factors present in the wheel well and cockpit environments.
• Genuine Cleveland OEM Part: As the genuine part specified by Cleveland Wheels & Brakes, it guarantees the correct thread pitch, taper angle, and material specifications required for a safe, leak-free, and airworthy brake system.

Technical Specifications

• Part Number: 079-00300
• Manufacturer: Cleveland Wheels & Brakes (Parker Hannifin)
• Component Type: Hydraulic Bleeder Screw / Valve
• Material: Steel Alloy
• Finish: Cadmium Plated
• Thread Specification: 3/8-24 UNF
• Head Style: Hexagonal (Hex Head)
• Associated Part: Mates with Bleeder Cap P/N 183-00100.
• Certification: FAA Production Approval

Aircraft Compatibility

The 079-00300 is the standard OEM bleeder screw for the master cylinders and calipers used on a vast portion of the global general aviation fleet.

• Common Aircraft Manufacturers:
  • Cessna: 152, 172, 182, 206, 210, 310, etc.
  • Piper: Cherokee, Warrior, Archer, Arrow, Saratoga, Seneca, etc.
  • Beechcraft: Bonanza, Baron, etc.
  • Mooney: M20 series
  • Cirrus: SR20, SR22 (models with Cleveland systems)
  • And countless other certified and experimental aircraft.

Applications

The 079-00300 is a critical valve for all hydraulic brake maintenance:

• Brake System Bleeding: Its sole function is to be momentarily opened to allow for the purging of air from the hydraulic lines, which is necessary to achieve a firm, responsive brake feel.
• Hydraulic Fluid Flushing: Provides the port for flushing old, contaminated hydraulic fluid from the system and replacing it with new fluid.
• System Integrity: When closed and torqued, it provides one of the final seals for the closed-loop hydraulic system.

Why Choose 079-00300?

Air in a hydraulic system is compressible and is a severe safety hazard, leading to "spongy" or completely ineffective brakes. The 079-00300 bleeder screw is the gateway for removing this air. Using a genuine Cleveland OEM part ensures the tapered seat is machined to the perfect angle for a positive seal and that the threads are of the correct class and strength to prevent stripping. A damaged or poorly manufactured bleeder screw can fail to seal properly, leading to a slow loss of fluid and pressure, or it can seize in the housing, making future maintenance impossible without damaging an expensive master cylinder or caliper. For this critical valve, trust only the OEM component.

Order Your 079-00300 Bleeder Screws Now

Ensure the integrity and serviceability of your aircraft's braking system with genuine OEM components. Visit Airparts.aero to order your Cleveland 079-00300 bleeder screws today.

The sealing mechanism of the 079-00300 bleeder screw is entirely mechanical, relying on the precise interface between its tapered seat and the corresponding flared seat in the component body. When the screw is tightened, the applied torque creates an immense axial clamping force. This force is concentrated on the small, circular line of contact between the two tapered surfaces, creating extremely high pressure that forces the two metal parts to conform to one another, creating a seal capable of holding hydraulic pressures well over 1000 PSI. The internal orifice is positioned so that when the screw is backed off by as little as a quarter turn, the seal is broken, and a path is created from the main hydraulic chamber, through the orifice, and out the top of the screw, allowing fluid and air to escape.

Note: This component must be torqued to the value specified in the applicable Cleveland or aircraft maintenance manual. Overtightening can damage the tapered seat, leading to a permanent leak. Undertightening will result in a poor seal. Always use the correct size hex wrench to avoid rounding the head. Ensure the threads are clean before installation.