Dorman HW412 Drum Brake Adjusting Spring Kit - Front, Front Left or Rear

Drum Brake Adjusting Spring Kit

Dorman HW412 is a standard replacement drum brake adjusting spring kit for rear drum brake service. It uses wire steel adjuster material and is built to match the original hardware needed to restore drum brake self-adjuster function on specified Ford, Lincoln, Mercury, Mazda, Chrysler, Dodge, and Jeep applications.

For rear drum brake repair on vehicles such as the Ford F-150, Ford Bronco, and Mercury Grand Marquis, this kit helps restore the adjusting mechanism with OE-style fit and material selection. Part number HW412 is also a direct cross-reference for Carlson H412 and Champion Spark Plug 412.

• Wire steel adjuster material for standard replacement service
• Matches original hardware requirements for drum brake repair
• Rear drum brake service kit for self-adjuster restoration
• Package contents: 2 drum brake adjusting spring kits
• Cross-reference: Carlson H412 and Champion Spark Plug 412

Detailed Product Overview

Dorman HW412 is built for drum brake service where the self-adjuster hardware has worn, weakened, or no longer operates correctly. The kit is engineered to match the original hardware used on specified rear drum brake assemblies, helping maintain proper shoe adjustment and consistent brake operation. With broad coverage across classic and late-model rear drum brake applications, HW412 serves as a practical replacement for vehicles including Ford Aerostar, Ford Explorer, Mazda Navajo, and Mercury Marquis.

Common Problems This Kit Helps Solve

• Broken or stretched drum brake adjusting springs
• Self-adjuster hardware that no longer holds tension
• Uneven rear brake shoe adjustment
• Noisy or inconsistent drum brake operation
• Worn hardware during rear brake service

Installation Notes and Fitment

Fits 1986-1997 Ford Aerostar, rear, compatible with 10" x 2.50" drum brakes for self-adjuster repair. Fits 1976-1996 Ford Bronco, rear, drum brake self-adjuster repair kit for 11.03 in. x 2.25 in. drum brake adjusting screw assembly. Fits 1975-1996 Ford E-150 Econoline, rear, drum brake self-adjuster repair kit for 11.03 in. x 2.25 in. drum brake adjusting screw assembly. Fits 1991-1994 Mazda Navajo, rear, compatible with 10" x 2.50" drum brakes for self-adjuster repair. Fits 1979-1991 Mercury Grand Marquis, rear, compatible with 10" x 2.50" drum brakes for self-adjuster repair or drum brake self-adjuster repair kit for 11 in. x 2.25 in. brakes.

Verify drum size and brake configuration before installation, especially on applications with multiple brake package notes. HW412 is listed for rear, front, and front left positions across the catalog fitment data, but each vehicle application should be matched to the exact drum brake dimensions shown in the fitment notes.

Quality Assurance

Dorman manufactures this kit as a standard replacement part engineered to match original hardware requirements and deliver reliable performance and durability in drum brake service.