Raybestos H438 Drum Brake Adjusting Screw Spring - Front or Rear
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Raybestos
 R-Line

Raybestos H438 Drum Brake Adjusting Screw Spring - Front or Rear

Brand Raybestos H438
Position Rear
Product line R-Line
Fits Ford, Mazda, and Mercury · 158 vehicles

Brake hardware. Adjusting screw spring for drum brake service.

Cross-references Carlson H438, Champion Spark Plug 438 and 8-6516 for the same application. See all 13.

$26.11Free shipping
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Step 2 — Quantity
Drum Brake Adjusting Screw Springs are typically replaced in pairs, axle by axle.
Order total $26.11
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Drum Brake Adjusting Screw Spring options

Drum Brake Adjusting Screw Spring for Rear Service

Restore proper drum brake adjuster function with the Raybestos R-Line H438 drum brake adjusting screw spring. This replacement hardware is built for rear drum brake service on select Ford and Mazda applications, including Ford Ranger, Mustang, and Mazda B-Series models with 9-inch drum brakes.

The Raybestos R-Line line focuses on service-grade brake hardware for common repair needs. Part number H438 is a direct-fit drum brake adjusting screw spring for rear drum brake self-adjuster assemblies where the original spring has weakened, stretched, or failed.

Key Features

  • Raybestos R-Line brake hardware for drum brake service
  • Drum brake adjusting screw spring for rear applications
  • Fits select 9-inch drum brake setups
  • Direct replacement part number H438
  • Cross-references Carlson H438 for the same application

Fitment Details

  • Fits 1983-1994 Ford Ranger, rear; fits models with 9-inch drum brakes and compatible 9" x 1 3/4" brake setups.
  • Fits 1994 Mazda B2300, rear; fits models with 9-inch drum brakes and compatible 9" x 1 3/4" brake setups.
  • Fits 1994 Mazda B3000, rear; fits models with 9-inch drum brakes and compatible 9" x 1 3/4" brake setups.
  • Fits 1994 Mazda B4000, rear; fits models with 9-inch drum brakes and compatible 9" x 1 3/4" brake setups.
  • Fits 1979-1990 Ford Mustang, rear; fits models with 9-inch drum brakes.
  • Fits 1991-1993 Ford Mustang, rear; drum brake self-adjuster repair kit compatible with 9" x 1 3/4" brakes.
  • Fits 1986-1992 Ford Aerostar, rear; fits models with 9-inch drum brakes.
  • Fits 1984-1990 Ford Bronco II, rear.
  • Fits 1980-1988 Ford Thunderbird, rear.
  • Fits 1980-1988 Mercury Cougar, rear.
  • Fits 1983-1986 Ford LTD, rear.
  • Fits 1979-1986 Mercury Capri, rear.
  • Fits 1983-1986 Mercury Marquis, rear.
  • Fits 1981-1983 Ford Fairmont, rear; with 9 in x 1-3/4 in brakes or 10 in x 1-3/4 in brakes.
  • Fits 1978-1983 Ford Fairmont, rear; fits models with 9-inch drum brakes.
  • Fits 1983 Ford Ranger, rear; drum brake self-adjuster repair kit compatible with 9" x 1 3/4" brakes.
  • Fits 1981-1983 Mercury Zephyr, rear.
  • Fits 1978-1980 Ford Fairmont, rear; with 9 in x 1-3/4 in brakes.
  • Fits 1971-1980 Ford Pinto, rear.
  • Fits 1975-1980 Mercury Bobcat, rear.
  • Fits 1978-1980 Mercury Zephyr, rear; fits models with 9-inch drum brakes.
  • Fits 1971-1973 Ford Pinto, front.

What This Part Helps Address

  • Weak or broken drum brake adjuster spring tension
  • Inconsistent self-adjuster operation in rear drum brakes
  • Brake shoe adjustment issues after drum brake service
  • Noisy or loose hardware in the adjuster assembly
  • Wear-related replacement during drum brake maintenance

Installation Notes

Verify drum size and brake configuration before ordering, especially on Ford Ranger, Ford Mustang, and Mazda B2300/B3000/B4000 applications. Match the spring to the existing self-adjuster layout and inspect related drum brake hardware for wear before reassembly. Confirm rear or front placement exactly as listed in the fitment data.

Quality Assurance

Raybestos R-Line brake hardware is cataloged for service replacement use across a wide range of Ford and Mazda drum brake applications. Part number H438 is listed for direct interchange with Carlson H438 and is referenced for the same application coverage.

This part fits 158 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
1994FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1994FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1994MazdaB2300—RearFits models with 9-inch drum brakes.; R-Line
1994MazdaB2300—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1994MazdaB3000—RearFits models with 9-inch drum brakes.; R-Line
1994MazdaB3000—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1994MazdaB4000—RearFits models with 9-inch drum brakes.; R-Line
1994MazdaB4000—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1993FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1993FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1993FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1993FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1992FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1992FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1992FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1992FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1991FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1991FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1991FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1991FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1990FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1990FordBronco II—RearR-Line
1990FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1990FordMustang—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1990FordMustang—Rearw/ 10" Drum; w/ 10" X 1.75" Brakes; R-Line
1990FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1990FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1989FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1989FordBronco II—RearR-Line
1989FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1989FordMustang—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1989FordMustang—Rearw/ 10" Drum; w/ 10" X 1.75" Brakes; R-Line
1989FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1989FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1988FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1988FordBronco II—RearR-Line
1988FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1988FordMustang—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1988FordMustang—Rearw/ 10" Drum; w/ 10" X 1.75" Brakes; R-Line
1988FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1988FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1988FordThunderbird—RearR-Line
1988FordThunderbird—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1988FordThunderbird—Rearw/ 10" X 1.75" Brakes; with 10 IN Brakes; R-Line
1988MercuryCougar—RearR-Line
1987FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1987FordBronco II—RearR-Line
1987FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1987FordMustang—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1987FordMustang—Rearw/ 10" Drum; w/ 10" X 1.75" Brakes; R-Line
1987FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1987FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1987FordThunderbird—RearR-Line
1987FordThunderbird—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1987FordThunderbird—Rearw/ 10" X 1.75" Brakes; with 10 IN Brakes; R-Line
1987MercuryCougar—RearR-Line
1986FordAerostar—RearFits models with 9-inch drum brakes.; R-Line
1986FordBronco II—RearR-Line
1986FordLTDBaseRearR-Line
1986FordLTDBroughamRearR-Line
1986FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1986FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1986FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1986FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1986FordThunderbird—RearR-Line
1986MercuryCapri—RearR-Line
1986MercuryCougar—RearR-Line
1986MercuryMarquis—RearR-Line
1985FordBronco II—RearR-Line
1985FordLTDLX BroughamRearR-Line
1985FordLTDBroughamRearR-Line
1985FordLTDBaseRearR-Line
1985FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1985FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1985FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1985FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1985FordThunderbird—RearR-Line
1985MercuryCapri—RearR-Line
1985MercuryCougar—RearR-Line
1985MercuryMarquis—RearR-Line
1984FordBronco II—RearR-Line
1984FordLTDBaseRearR-Line
1984FordLTDBroughamRearR-Line
1984FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1984FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1984FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1984FordRanger—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1984FordThunderbird—RearR-Line
1984MercuryCapri—RearR-Line
1984MercuryCougar—RearR-Line
1984MercuryMarquis—RearR-Line
1983FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; with 10 IN x 1-3/4 IN Brakes; R-Line
1983FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1983FordLTDBaseRearR-Line
1983FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1983FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1983FordRanger—RearFits models with 9-inch drum brakes.; R-Line
1983FordRanger—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1983FordThunderbird—RearR-Line
1983MercuryCapri—RearR-Line
1983MercuryCougar—RearR-Line
1983MercuryMarquis—RearR-Line
1983MercuryZephyr—RearR-Line
1982FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; with 10 IN x 1-3/4 IN Brakes; R-Line
1982FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1982FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1982FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1982FordThunderbird—RearR-Line
1982MercuryCapri—RearR-Line
1982MercuryCougar—RearR-Line
1982MercuryZephyr—RearR-Line
1981FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; with 10 IN x 1-3/4 IN Brakes; R-Line
1981FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1981FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1981FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1981FordThunderbird—RearR-Line
1981MercuryCapri—RearR-Line
1981MercuryCougar—RearR-Line
1981MercuryZephyr—RearR-Line
1980FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; R-Line
1980FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1980FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1980FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1980FordPinto—RearR-Line
1980FordThunderbird—RearR-Line
1980MercuryBobcat—RearR-Line
1980MercuryCapri—RearR-Line
1980MercuryCougar—RearR-Line
1980MercuryZephyr—RearFits models with 9-inch drum brakes.; R-Line
1980MercuryZephyr—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1979FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; R-Line
1979FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1979FordMustang—RearFits models with 9-inch drum brakes.; R-Line
1979FordMustang—RearDrum Brake Self-Adjuster Repair Kit compatible with 9" X 1 3/4" Brakes.; R-Line
1979FordPinto—RearR-Line
1979MercuryBobcat—RearR-Line
1979MercuryCapri—RearR-Line
1979MercuryZephyr—RearFits models with 9-inch drum brakes.; R-Line
1979MercuryZephyr—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1978FordFairmont—Rearwith 9 IN x 1-3/4 IN Brakes; R-Line
1978FordFairmont—RearFits models with 9-inch drum brakes.; R-Line
1978FordPinto—RearR-Line
1978MercuryBobcat—RearR-Line
1978MercuryZephyr—RearFits models with 9-inch drum brakes.; R-Line
1978MercuryZephyr—RearCompatible with 9" X 1 3/4" and 9 IN Brakes.; R-Line
1977FordPinto—RearR-Line
1977MercuryBobcat—RearR-Line
1976FordPinto—RearR-Line
1976MercuryBobcat—RearR-Line
1975FordPinto—RearR-Line
1975MercuryBobcat—RearR-Line
1974FordPinto—RearR-Line
1973FordPinto—FrontR-Line
1973FordPinto—RearR-Line
1972FordPinto—FrontR-Line
1972FordPinto—RearR-Line
1971FordPinto—FrontR-Line
1971FordPinto—RearR-Line
Directly replaces or cross-references 13 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Carlson — H438Champion Spark Plug — 4388-6516060-455243800AS438XBS438D1FZ2049AF73107F73107SH438-2H438DPHW438