PowerStop L1377 Disc Brake Caliper - Rear Right

Rear Right OE Replacement Caliper

PowerStop L1377 is a rear right disc brake caliper built as a direct OE stock replacement for 1990-1993 Mazda Miata applications. It is remanufactured for factory-style fitment and includes the bracket, slides, and internal service components needed for a clean replacement on the rear brake corner.

For Mazda Miata owners restoring braking performance on a 1990, 1991, 1992, or 1993 rear right position, this PowerStop caliper provides a straightforward OE-style solution. The L1377 is part of PowerStop’s Rear OE Stock Replacement Caliper line, focused on direct-fit hydraulic replacement parts for stock brake systems.

Key Features

• Direct replacement rear disc brake caliper for the rear right position
• Remanufactured cast iron caliper with floating design
• 1 steel piston with 31.67 mm piston diameter
• Bracket included; caliper slides included
• New seals, dust boots, bleeder screw, and stainless steel pad abutment clips installed during assembly
• High-temperature EPDM rubber dust boots and silicone lubricant for smoother operation
• Pressure tested to verify piston operation and check for leaks
• M10 x 1.0 inlet thread size and M7 x 1.0 bleeder screw thread size

Product Details

PowerStop remanufactures the caliper and bracket in Chicago, Illinois, then pressure tests each unit before release. The housing uses cast iron construction with a gray finish, a floating caliper design, and steel piston hardware for OE-style brake service. This part number, L1377, is built for the rear right side of the Mazda Miata and follows the stock replacement format expected in a factory brake repair.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Brake Issues It Can Address

• Sticking or uneven rear brake caliper movement
• Brake fluid leakage at the caliper body or bleeder area
• Worn piston seals, boots, or slide components
• Corrosion-related caliper performance loss
• Poor rear brake response from a worn OE caliper

Installation Notes

Verify rear right fitment before installation on 1990-1993 Mazda Miata models. Confirm inlet and bleeder thread sizes match the vehicle’s brake line and service fittings. Inspect pads, rotors, and brake fluid condition during caliper replacement, and bleed the hydraulic system after installation to remove air from the circuit.

Quality Assurance

PowerStop remanufactures this caliper and bracket in its Chicago facility and pressure tests each unit to confirm piston operation and help prevent leaks. The assembly uses new seals, slide pins where applicable, dust boots, bleeder screws, and stainless steel pad abutment clips for OE-style service quality.