PowerStop L1378 Disc Brake Caliper - Rear Left

PowerStop Rear OE Stock Replacement Caliper Overview

The PowerStop - Rear OE Stock Replacement Caliper (Part Number L1378) is designed specifically for Mazda Miata models requiring reliable rear disc brake caliper replacement. Engineered to meet original equipment specifications, this floating caliper ensures consistent braking performance and durability.

• Caliper type: Floating with one piston
• Caliper casting material: Durable cast iron construction
• Piston diameter: 31.67 mm steel piston for strength and heat resistance
• Caliper slides included for smooth operation
• Mounting bracket included for proper fitment
• Caliper color: Gray finish
• Inlet thread size: M10 x 1.0
• Bleeder screw thread size: M7 x 1.0
• Grade type: Regular

About the PowerStop - Rear OE Stock Replacement Caliper Line

The PowerStop - Rear OE Stock Replacement Caliper product line focuses on providing direct OE replacement parts that maintain factory performance and fitment. This line is tailored for drivers who need a dependable rear disc brake caliper that matches the original specifications of their vehicle. The L1378 caliper is part of this line, offering a cast iron floating caliper solution with included caliper slides and mounting bracket to ensure proper installation and operation on compatible vehicles.

Detailed Product Description

This PowerStop rear disc brake caliper is constructed from cast iron, providing the necessary strength and heat dissipation required for rear braking applications on the Mazda Miata. The single steel piston with a diameter of 31.67 mm delivers consistent clamping force, while the floating caliper design allows for self-alignment during braking. Included caliper slides and mounting bracket facilitate smooth movement and secure attachment. The gray finish offers corrosion resistance and a clean appearance. Thread sizes for the inlet (M10 x 1.0) and bleeder screw (M7 x 1.0) match OE specifications, ensuring compatibility with existing brake lines and bleeding tools.

Compatible Vehicles and Common Applications

• Replacement for worn or leaking rear disc brake calipers on Mazda Miata models
• Addresses issues such as uneven brake pad wear or reduced braking efficiency
• Resolves caliper piston sticking or binding problems
• Suitable for restoring rear brake performance after damage or corrosion
• Used when upgrading to OE stock replacement parts for maintenance or repair

Installation Notes and Tips

Ensure the brake system is properly bled after installation to remove air and maintain braking performance. Verify that the mounting bracket is securely fastened and that caliper slides move freely to prevent uneven pad wear. Use compatible brake fluid and follow vehicle-specific torque specifications for all fasteners. This caliper does not include mounting hardware, so retain original bolts or source appropriate replacements if necessary.

Quality Assurance and Warranty

PowerStop manufactures this rear OE stock replacement caliper to meet or exceed original equipment standards. The cast iron construction and steel piston materials are selected for durability and consistent performance. While specific warranty details are not provided here, PowerStop products typically come with manufacturer-backed quality assurance to support reliable operation on Mazda Miata vehicles.