Internal hose degradation and environmental exposure cause rubber brake lines to develop cracks, dry rot, and internal collapse, leading to pressure loss, uneven caliper response, and potential fluid leaks. Upgrading to this PowerStop Autospecialty brake caliper ensures a direct replacement that restores hydraulic integrity, providing immediate pedal response and eliminating volumetric expansion during heavy fleet braking conditions. Designed for severe-duty applications, this caliper assembly is built with high-temperature EPDM rubber dust boots and premium lubricants for long-lasting operation in harsh environments.
This PowerStop L5399 caliper assembly is a complete, bolt-on solution that includes all necessary hardware — new seals, guide pins, bleeder screws, dust boots, and mounting brackets. Manufactured and pressure tested to meet strict quality standards, it guarantees reliable brake performance without the need for modifications. The assembly’s stainless-steel abutment hardware and high-quality components are engineered for durability, reducing the risk of caliper sticking or failure during demanding operations. Suitable for heavy-duty commercial fleets, this caliper provides a hassle-free upgrade for vehicles requiring high performance and long service life.
Proper installation involves routing the caliper correctly to prevent chassis chaffing and ensuring full twist clearance during steering cycles. Always verify existing line length, fittings, and mounting points before ordering to ensure compatibility. Routine inspection of the mounting brackets and hardware is recommended to maintain optimal brake function and safety in demanding fleet applications.
Features:
- Direct replacement for OEM part number L5399
- Complete assembly includes seals, guide pins, bleeder screws, dust boots, and mounting brackets
- High-temperature EPDM rubber dust boots for durability
- Stainless-steel hardware for corrosion resistance
- Pressure tested and inspected for consistent high-quality performance



