Carlson H438 Drum Brake Adjusting Spring Kit - Rear
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Carlson

Carlson H438 Drum Brake Adjusting Spring Kit - Rear

Brand Carlson H438
Position Rear
Fits Ford, Mazda, and Mercury · 130 vehicles

Brake service kit. Keeps drum brake components working together for proper adjustment.

Adjusting spring kit. Replacement springs help restore consistent brake operation.

$11.36Free shipping
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Step 2 — Quantity
Drum Brake Adjusting Spring Kits are typically replaced in pairs, axle by axle.
Order total $11.36
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Carlson H438 Drum Brake Adjusting Spring Kit

The Carlson H438 drum brake adjusting spring kit is a rear brake service part for vehicles with drum brake self-adjuster hardware. It helps restore proper spring tension in the brake adjuster assembly so the rear drum brake system can operate as intended. This part is a direct-fit service solution for a wide range of Ford and Mazda rear drum brake applications.

Key Features

  • Rear drum brake adjusting spring kit for service and repair work
  • Fits select 9" x 1.75" drum brake applications and select 10" x 1.75" applications
  • Used in rear brake self-adjuster assemblies
  • Designed for Ford Ranger, Mustang, Bronco II, Aerostar, Thunderbird, Pinto, and related Mazda applications
  • Carlson H438 part number for fitment-based brake service searches

Detailed Description

Brakes work as a system, and the adjuster springs play an important role in keeping rear drum brake hardware operating correctly. Carlson H438 is a drum brake adjusting spring kit for rear applications across multiple Ford and Mazda models, including Ford Ranger, Ford Mustang, and Mazda B2300. It is listed for vehicles with 9" x 1.75" drum brakes as well as select 10" x 1.75" drum brake setups, depending on the vehicle and brake configuration. This part cross-references 474 and 151 for the same application.

Fits 1988-1994 Ford Ranger, rear. Fits 1994 Mazda B2300, rear. Fits 1987-1993 Ford Mustang, rear. Fits 1986-1992 Ford Aerostar, rear. Fits 1987-1990 Ford Bronco II, rear. Fits 1985-1988 Ford Cougar, rear. Fits 1983-1988 Ford Thunderbird, rear. Fits 1983-1988 Mercury Cougar, rear. Fits 1980-1988 Mercury Cougar, rear. Fits 1979-1986 Ford Mustang, rear. Fits 1979-1986 Mercury Capri, rear. Fits 1978-1983 Ford Fairmont, rear. Fits 1978-1983 Mercury Zephyr, rear. Fits 1980-1982 Ford Thunderbird, rear. Fits 1980-1982 Mercury Cougar, rear. Fits 1980 Ford Pinto, rear. Fits 1980 Mercury Bobcat, rear. Fits 1974-1979 Ford Pinto, rear. Fits 1975-1979 Mercury Bobcat, rear. Fits 1972-1973 Ford Pinto, rear.

What It Helps Address

  • Weak or stretched rear drum brake adjuster springs
  • Inconsistent self-adjuster operation in drum brake assemblies
  • Brake hardware wear during rear brake service
  • Loss of proper spring tension in the adjuster mechanism
  • Fitment-specific repair needs on older Ford and Mazda rear drum brakes

Installation Notes and Tips

Verify drum size and brake configuration before ordering, since this part is listed for both 9" x 1.75" and select 10" x 1.75" rear drum brake setups. Match the vehicle year, make, model, and rear brake specification to the fitment data before installation. Inspect related drum brake hardware for wear during service so the adjuster assembly can operate correctly after replacement.

Quality Assurance

Carlson brake service parts are built for repair work on specific brake hardware applications. Use the confirmed fitment data for the exact vehicle and rear drum brake configuration before installation.

Related reading

This part fits 130 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1994FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1994MazdaB2300RearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1994MazdaB3000RearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1994MazdaB4000RearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1993FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1993FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1992FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1992FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1992FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1991FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1991FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1991FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1990FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1990FordBronco IIRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1990FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1990FordMustangRearw/10" x 1.75" Brakes; 151; 10" x 1.75"
1990FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1989FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1989FordBronco IIRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1989FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1989FordMustangRearw/10" x 1.75" Brakes; 151; 10" x 1.75"
1989FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1988FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1988FordBronco IIRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1988FordCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1988FordCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1988FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1988FordMustangRearw/10" x 1.75" Brakes; 151; 10" x 1.75"
1988FordRangerRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1988FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1988FordThunderbirdRearw/10" x 1.75" Brakes; 151
1988MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1988MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1987FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1987FordBronco IIRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1987FordCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1987FordCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1987FordMustangRearFitment: Fits drums with a diameter of 9 inches and a width of 1.75 inches.
1987FordMustangRearw/10" x 1.75" Brakes; 151; 10" x 1.75"
1987FordRangerRearDrum Brake Adjusting Spring Kit with 9" x 1.75" Brakes; 569/474
1987FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1987FordThunderbirdRearw/10" x 1.75" Brakes; 151
1987MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1987MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1986FordAerostarRearFits drum brake adjusting spring kit for vehicles with 9" brakes and 569 model number.
1986FordBronco IIRear569/474
1986FordCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1986FordCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1986FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1986FordRangerRearDrum Brake Adjusting Spring Kit with 9" x 1.75" Brakes; 569/474
1986FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1986FordThunderbirdRearw/10" x 1.75" Brakes; 151
1986MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1986MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1986MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1985FordBronco IIRear569/474
1985FordCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1985FordCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1985FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1985FordRangerRearDrum Brake Adjusting Spring Kit with 9" x 1.75" Brakes; 569/474
1985FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1985FordThunderbirdRearw/10" x 1.75" Brakes; 151
1985MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1985MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1985MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1984FordBronco IIRear569/474
1984FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1984FordRangerRearDrum Brake Adjusting Spring Kit with 9" x 1.75" Brakes; 569/474
1984FordThunderbirdRearw/10" x 1.75" Brakes; 151
1984FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1984MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1984MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1984MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1983FordFairmontRearFor 9" drum brakes; 474
1983FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1983FordRangerRearFits 9" x 1.75" Drum Brakes, 474
1983FordThunderbirdRearw/10" x 1.75" Brakes; 151
1983FordThunderbirdRearCompatible with vehicles equipped with 9" x 1.75" Drum Brakes, 569
1983MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1983MercuryCougarRearFits 9" Drum Brakes with dimensions 9" x 1.75"; compatible with model 569.
1983MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1983MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1983MercuryZephyrRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1982FordFairmontRearFor 9" drum brakes; 474
1982FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1982FordThunderbirdRearw/10" x 1.75" Brakes; 151
1982FordThunderbirdRearFits 9" x 1.75" Drum Brakes, 474
1982MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1982MercuryCougarRear9" Brakes; 9" x 1.75"; 474
1982MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1982MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1982MercuryZephyrRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1981FordFairmontRearFor 9" drum brakes; 474
1981FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1981FordThunderbirdRearw/10" x 1.75" Brakes; 151
1981FordThunderbirdRearFits 9" x 1.75" Drum Brakes, 474
1981MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1981MercuryCougarRear9" Brakes; 9" x 1.75"; 474
1981MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1981MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1981MercuryZephyrRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1980FordFairmontRearFor 9" drum brakes; 474
1980FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1980FordPintoRearFits 9" x 1.75" Drum Brakes, 474
1980FordThunderbirdRearw/10" x 1.75" Brakes; 151
1980FordThunderbirdRearFits 9" x 1.75" Drum Brakes, 474
1980MercuryBobcatRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1980MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1980MercuryCougarRear9" Brakes; 9" x 1.75"; 474
1980MercuryCougarRearFitment: Drum Brake Adjusting Spring Kit for 10" x 1.75" Drum Brakes, 151.
1980MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1979FordFairmontRearFor 9" drum brakes; 474
1979FordMustangRearDrum Brake Adjusting Spring Kit fits 9" x 1.75" drums, 474 model.
1979FordPintoRearw/9" x 1.75" Brakes; 431/391
1979MercuryBobcatRear9" x 1.75" Drum Brake Self-Adjuster Repair Kit; 474/431
1979MercuryCapriRearCompatible with 9" x 1.75" dimensions and 474 model for parking brake strut spring.
1979MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1978FordFairmontRearFor 9" drum brakes; 474
1978FordPintoRearw/9" x 1.75" Brakes; 431/391
1978MercuryBobcatRear9" x 1.75" Drum Brake Self-Adjuster Repair Kit; 474/431
1978MercuryZephyrRear9" Brakes; 9" x 1.75"; 474
1977FordPintoRearw/9" x 1.75" Brakes; 431/391
1977MercuryBobcatRear9" x 1.75" Drum Brake Self-Adjuster Repair Kit; 474/431
1976FordPintoRearw/9" x 1.75" Brakes; 431/391
1976MercuryBobcatRear9" x 1.75" Drum Brake Self-Adjuster Repair Kit; 474/431
1975FordPintoRearw/9" x 1.75" Brakes; 431/391
1975MercuryBobcatRear9" x 1.75" Drum Brake Self-Adjuster Repair Kit; 474/431
1974FordPintoRearw/9" x 1.75" Brakes; 431/391
1973FordPintoRearw/9" x 1.75" Brakes; 391
1972FordPintoRearw/9" x 1.75" Brakes; 391