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139-20001 - Cleveland Parker Piston Boot For 30-170 Series Brake Assembly

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139-20001 - Cleveland Parker Piston Boot For 30-170 Series Brake Assembly
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139-20001 - Cleveland Parker Piston Boot For 30-170 Series Brake Assembly

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139-20001 – Cleveland/Parker Brake Piston Boot (30-170 Series)

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The Cleveland (Parker-Hannifin) 139-20001 is a critical environmental "dust boot" designed for the high-performance 30-170 series aircraft brake assemblies. While nearly identical in function to the 139-20000, the 139-20001 is typically distinguished by its material composition or specific fitment for later-revision calipers within the 30-170 family. This component serves as a flexible, protective barrier that isolates the brake piston and the sensitive hydraulic cylinder bore from the abrasive and corrosive environment of the landing gear bay.

Constructed from a high-durability, heat-resistant elastomer, the 139-20001 is engineered to withstand the intense thermal radiation generated during high-energy braking events. By preventing runway debris, carbon dust from brake linings, and moisture from reaching the primary hydraulic seals, this boot prevents "piston scoring" and hydraulic leaks. For the maintenance professional, the 139-20001 is an essential replacement item during any brake caliper overhaul to ensure the continued safety and dispatch reliability of the aircraft.

Key Features

  • Thermal Resilience: Formulated to maintain elasticity and structural integrity at elevated temperatures, preventing the boot from melting or becoming brittle during heavy landing cycles.

  • Bellows-Style Architecture: Features an accordion-fold design that allows for unrestricted piston extension and retraction throughout the entire wear life of the brake linings.

  • Contaminant Exclusion: Specifically designed to block microscopic grit and de-icing fluids that can cause "stiction" or premature failure of the internal O-ring.

  • Chemical Stability: Highly resistant to degradation from exposure to MIL-PRF-5606 / AS5606 hydraulic fluids and common aviation cleaning agents.

  • Precision Snap-Fit: Engineered with reinforced beads for a secure mechanical lock into the caliper housing and onto the piston head.

Technical Specifications

  • Part Number: 139-20001

  • Manufacturer: Cleveland / Parker-Hannifin (Aircraft Wheel & Brake Division)

  • Component Type: Brake Piston Dust Boot / External Seal

  • Material: Specialized High-Temp Synthetic Elastomer

  • Compatible Assemblies: Cleveland 30-170 series (Check IPC for specific dash-number compatibility)

  • Color: Black

  • Operating Envelope: Optimized for turbine and high-performance piston aircraft environments.

  • Certification: FAA-PMA / OEM Original Equipment

Aircraft Compatibility

  • Cessna 208/208B Caravan: Widely used in main landing gear brake systems.

  • Beechcraft King Air Series: Common in various 90, 200, and 300 series configurations.

  • Pilatus PC-12: Utilized in specific high-utilization braking architectures.

  • Piper PA-42 Cheyenne: Found in dual-caliper or heavy-duty brake setups.

  • Note: Always consult the Parker/Cleveland Application Guide or the Aircraft Illustrated Parts Catalog (IPC) to ensure the -20001 is the correct revision for your specific caliper part number.

Why Choose 139-20001?

Choosing the genuine Cleveland 139-20001 is a matter of flight safety and long-term cost management. An inferior or "will-fit" boot can fail during a high-speed aborted takeoff (RTO), where temperatures spike rapidly. If a boot fails and debris enters the cylinder, it can lead to Piston Seizure, causing the aircraft to pull violently to one side during a landing rollout. The 139-20001 is tested to the exact Compression Set and Tensile Strength requirements of the original Parker-Hannifin design, ensuring the brakes remain responsive and leak-free.

The 139-20001 operates on the principle of Dynamic Exclusion Sealing. Unlike the internal hydraulic O-ring, which manages fluid pressure, this boot manages Surface Finish Integrity. From a materials perspective, the elastomer is optimized to resist Ozone Cracking, which is critical for aircraft parked in high-altitude environments or near electrical equipment.

During the braking cycle, the piston moves outward, and the 139-20001 undergoes linear expansion. If the boot material has insufficient Elastic Recovery, it can "bag" or fold improperly, potentially getting caught between the piston and the brake lining. The 139-20001 is engineered with a specific Durometer (hardness) that ensures it always returns to its compact state upon piston retraction, maintaining a clean interface for the next application.

Note: The 139-20001 is a safety-critical part. During inspection, look for "checking" (cracks), swelling, or hardening. Any sign of hydraulic fluid weeping from the boot indicates an internal O-ring failure. Installation must be performed by a certified A&P mechanic in accordance with Cleveland Maintenance Manual WMM6000.

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