PowerStop L1139 Disc Brake Caliper - Front Left

Reliable Front OE Stock Replacement Caliper for BMW Models

The PowerStop L1139 disc brake caliper is designed to provide dependable braking performance for select BMW vehicles. Engineered as a front OE stock replacement, this caliper ensures compatibility and consistent operation for models like the 318i, 318is, 325e, 325es, 325i, 325is, and 325iX.

• Cast iron caliper casting for durability
• Floating caliper type with one steel piston (47.98 mm diameter)
• Includes caliper slides and mounting bracket for proper fitment
• Gray finish for corrosion resistance
• Bleeder screw with M7 x 1.0 thread size for maintenance

About the PowerStop - Front OE Stock Replacement Caliper Line

The PowerStop - Front OE Stock Replacement Caliper line is designed to match original equipment specifications, providing a direct replacement solution for front disc brake calipers. This line focuses on maintaining factory performance and fitment, making it suitable for BMW owners seeking a reliable and consistent braking component without modification.

Detailed Product Description

The PowerStop L1139 caliper features a cast iron construction that offers strength and heat resistance necessary for effective braking. Its floating caliper design utilizes a single steel piston with a diameter of 47.98 mm, ensuring even pressure distribution on the brake pads. The inclusion of caliper slides and a mounting bracket facilitates proper installation and alignment on the front brake assembly. Finished in gray, the caliper resists corrosion and maintains structural integrity over time. The bleeder screw with an M7 x 1.0 thread size allows for straightforward brake fluid bleeding during maintenance.

Common Applications and Problem Solving

• Replacement for worn or seized front calipers on BMW 318i, 318is, 325e, 325es, 325i, 325is, and 325iX models
• Addresses uneven brake pad wear caused by caliper sticking
• Resolves brake drag issues due to faulty piston operation
• Improves braking response when original caliper components have deteriorated
• Restores proper brake fluid pressure and pedal feel

Installation Notes and Tips

Ensure the brake system is properly depressurized before removing the old caliper. The PowerStop L1139 includes caliper slides and a mounting bracket but does not include additional mounting hardware, so verify existing hardware condition prior to installation. Use the correct bleeder screw size (M7 x 1.0) for brake fluid bleeding. It is recommended to inspect brake pads and rotors during installation and replace if necessary to maintain optimal braking performance.

Quality Assurance and Warranty

PowerStop manufactures the L1139 caliper to meet OE specifications, ensuring reliable performance and fitment. The cast iron construction and steel piston materials contribute to long service life under normal operating conditions. Warranty details should be confirmed with the product documentation or supplier, as coverage may vary.