Standard Ignition PWS129 Disc Brake Pad Wear Sensor - Rear

Rear Brake Pad Wear Sensor for BMW

Standard Ignition PWS129 is a disc brake pad wear sensor for rear brake caliper applications. It monitors brake pad condition and supports timely service alerts on select BMW 3 Series and M3 models.

• Disc brake pad wear sensor for rear brake caliper mounting
• Female connector with round shape and 1 connector interface
• 29.5-inch harness length for routing to the brake system
• Male pin terminals with 2-terminal configuration
• Direct replacement style for wear-indicator service on BMW rear brake systems

Fitment and Application Details

Compatible with rear brake wear sensor applications on 1992-1999 BMW 318i, 1992-1999 BMW 318is, 1998-1999 BMW 323i, 1998 BMW 323is, 1996-1999 BMW 328i, 1995-1999 BMW M3, 1992-1995 BMW 320i, 1992-1995 BMW 325i, and 1992-1995 BMW 325is. This part cross-references BMW (e.g., 34351181342) for the same application.

Standard Ignition PWS129 is built for rear brake caliper mounting and uses a female round connector with male pin terminals. The harness length measures 29.5 inches, which supports routing along the brake assembly on the listed BMW rear applications. Use this sensor when servicing brake pad wear warning systems on BMW 318i, 325i, and M3 models.

Common Reasons to Replace

• Brake pad wear warning light stays on after pad service
• Damaged sensor lead or connector at the rear caliper
• Intermittent brake pad wear signal
• Sensor abrasion from heat, road debris, or brake movement
• Faulty wear-indicator reading on BMW rear brake systems

Installation Notes and Quality Assurance

Install at the rear brake caliper and verify connector style, terminal layout, and harness routing before final assembly. Inspect the brake pad wear circuit and surrounding components for damage during service, especially on BMW 318i, 328i, and M3 rear brake applications. Standard Ignition replacement parts are engineered to meet application-specific service requirements for brake system repair.