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Dorman M39324 Brake Master CylinderOE Quality 60-Day Returns
Part #: M39324

Dorman M39324 Brake Master Cylinder

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116 vehicles fit this part
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Fitment: Chevrolet and GMC, R1500 Suburban, R2500 Suburban, V1500 Suburban, V2500 Suburban, R2500, R20, R20 Suburban, V20 Suburban, V20, V2500, C10 Suburban, C20, C20 Suburban, K10 Suburban, K20, K20 Suburban, C1500 Suburban, C2500, C2500 Suburban, K1500 Suburban, K2500, and K2500 Suburban
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Reliable Brake Master Cylinder for Chevrolet and GMC Trucks

The Dorman M39324 brake master cylinder is engineered to restore proper brake hydraulics for select Chevrolet and GMC truck models. Designed with durable cast iron and a 1.25-inch bore diameter, this master cylinder includes a reservoir and supports dual outlet configurations for effective brake fluid distribution.

  • Master cylinder bore diameter: 1.25 inches
  • Constructed from cast iron for durability
  • Includes reservoir for brake fluid
  • Two outlets with secondary outlet thread diameter of 0.5 inches
  • Rearward outlet size: 9/16-18
  • Mounting hardware not included
  • Compatible with multiple Chevrolet and GMC Suburban and truck models

Product Details and Specifications

The Dorman M39324 brake master cylinder is designed specifically for brake hydraulics systems requiring a 1.25-inch bore diameter. Its cast iron construction ensures long-lasting performance under demanding conditions. The included reservoir allows for proper brake fluid containment and circulation. This master cylinder features two outlets, including a secondary outlet with a 0.5-inch thread diameter and a rearward outlet sized at 9/16-18, facilitating proper brake line connections. Note that mounting hardware is not included with this part.

Compatible Chevrolet and GMC Models

This brake master cylinder is compatible with a range of Chevrolet and GMC trucks and Suburban models, including C10 Suburban, C20, C20 Suburban, C1500 Suburban, C2500, C2500 Suburban, K10 Suburban, K20, K20 Suburban, K1500 Suburban, K2500, K2500 Suburban, R20, R20 Suburban, R1500, R2500, R2500 Suburban, V20, V20 Suburban, V1500, and V2500 Suburban. Ensure compatibility by verifying your vehicle model before installation.

Common Brake System Issues Addressed

  • Brake pedal sinking or sponginess due to master cylinder wear
  • Brake fluid leaks from a damaged or corroded master cylinder
  • Reduced braking efficiency caused by internal seal failure
  • Brake warning light activation related to hydraulic pressure loss
  • Uneven brake pressure distribution affecting vehicle control

Installation Notes and Tips

When installing the Dorman M39324 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Use appropriate brake fluid compatible with your vehicle specifications. Since mounting hardware is not included, retain or source the correct hardware for secure installation. Verify all outlet connections match your brake line fittings, especially the secondary outlet thread diameter of 0.5 inches and rearward outlet size of 9/16-18.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The M39324 brake master cylinder undergoes rigorous quality control to ensure reliable performance. Please refer to Dorman's warranty policy for specific coverage details on this part.

BrandDorman
Part NumberM39324
Master Cylinder Bore Diameter1.25
Master Cylinder MaterialCast Iron
Mounting Hardware IncludedNo
Number of Outlets2
Package ContentsMaster Cylinder
Rearward Outlet Size9/16-18
Reservoir IncludedYes
Secondary Outlet Thread Diameter0.5
Sensor IncludedNo

This part fits 116 vehicles. Search below:

YearMakeModelFuel TypePositionNotes
1991ChevroletR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1991ChevroletR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1991ChevroletV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1991ChevroletV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1991GMCR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1991GMCR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1991GMCV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1991GMCV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1990ChevroletR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1990ChevroletR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1990ChevroletV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1990ChevroletV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1990GMCR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1990GMCR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1990GMCV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1990GMCV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989ChevroletR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1989ChevroletR2500N/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989ChevroletR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989ChevroletV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1989ChevroletV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989GMCR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1989GMCR2500N/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989GMCR2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1989GMCV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1989GMCV2500 SuburbanN/AVerify vehicle compatibility before purchasing 1.25" bore size drum brake wheel cylinder.
1988ChevroletR20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1988ChevroletR20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1988ChevroletV20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1988GMCR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1988GMCR2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1988GMCR2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1988GMCV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1988GMCV2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987ChevroletR20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987ChevroletR20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987ChevroletV20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987ChevroletV20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987GMCR1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1987GMCR2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987GMCR2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987GMCV1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1987GMCV2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1987GMCV2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1986ChevroletC20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986ChevroletC20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1986ChevroletK20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986ChevroletK20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1986GMCC2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986GMCC2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1986GMCK2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1986GMCK2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1985ChevroletC20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985ChevroletC20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1985ChevroletK20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985ChevroletK20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1985GMCC2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985GMCC2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1985GMCK2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1985GMCK2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1984ChevroletC20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984ChevroletC20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1984ChevroletK20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984ChevroletK20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1984GMCC2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984GMCC2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1984GMCK2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1984GMCK2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1983ChevroletC20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983ChevroletC20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1983ChevroletK20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983ChevroletK20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1983GMCC2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983GMCC2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1983GMCK2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1983GMCK2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1982ChevroletC20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982ChevroletC20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1982ChevroletK20GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982ChevroletK20 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1982GMCC2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982GMCC2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1982GMCK2500GASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1982GMCK2500 SuburbanGASN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981ChevroletC10 SuburbanN/A13 In. Brakes; Stamped-18010748
1981ChevroletC20N/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981ChevroletC20 SuburbanN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981ChevroletK10 SuburbanN/A13 In. Brakes; Stamped-18010748
1981ChevroletK20N/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981ChevroletK20 SuburbanN/A13 In. Brakes; Stamped-18010748
1981GMCC1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1981GMCC2500N/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981GMCC2500 SuburbanN/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981GMCK1500 SuburbanN/A13 In. Brakes; Stamped-18010748
1981GMCK2500N/ABrake Master Cylinder fits 13-inch brakes with a 1.25 inch bore size.
1981GMCK2500 SuburbanN/A13 In. Brakes; Stamped-18010748

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

10-18721044641187213-1872130.66013174-599180080682539324783-44013F104464M-86013M1872M900369MC104464

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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