PowerStop L1139 Disc Brake Caliper - Front Left

OE Front Left Brake Caliper Replacement

PowerStop L1139 is a front left disc brake caliper built as a direct OE stock replacement for select BMW applications with Girling front calipers. It is remanufactured in Chicago, pressure tested for piston operation and leak prevention, and assembled with new internal and service components for consistent brake performance.

Compatible With 1984-1987 BMW 325e, front left; 1986-1987 BMW 325es, front left; 1987-1991 BMW 325i, front left; 1987-1991 BMW 325is, front left; 1988-1991 BMW 325iX, front left; 1991 BMW 318i, front left; and 1991 BMW 318is, front left.

Key Features

• Direct-fit replacement for the front left position
• Floating caliper design with one 47.98 mm piston
• Cast iron caliper body with gray finish
• Steel piston construction
• Mounting bracket included; mounting hardware not listed
• Caliper slides included for service-ready installation
• Bleeder screw thread size: M7 x 1.0
• New seals, slide pins where applicable, dust boots, bleeder screws, and stainless steel pad abutment clips
• High-temperature EPDM rubber dust boots and silicone lubricant for smoother operation

Product Details

PowerStop’s Autospecialty OE Replacement Caliper line focuses on stock-style brake service for drivers who want a straightforward replacement part without changing the original brake setup. L1139 is remanufactured to OE replacement standards and pressure tested to verify piston movement and help prevent leaks. The caliper and bracket are rebuilt with new seals and service components to support reliable braking on BMW 3 Series models equipped with Girling front calipers.

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

Common Brake Issues It Can Address

• Sticking or uneven front left brake caliper movement
• Brake fluid leakage at the caliper body or seals
• Uneven pad wear caused by worn slide components
• Reduced braking response from a worn piston or internal seal
• Corrosion-related caliper service issues on older BMW brake systems

Installation Notes

Verify the vehicle uses Girling front calipers before ordering. Confirm the front left position, piston size, and bleeder thread specification during brake service. Inspect brake hoses, pads, and rotors before installation, and bleed the hydraulic system after replacement to restore proper pedal feel.

Quality Assurance

PowerStop remanufactures this caliper and bracket in Chicago, IL and pressure tests each unit to confirm piston operation and check for leaks. The assembly uses new seals, dust boots, bleeder screws, and stainless steel pad abutment clips to support consistent OE-style brake service.