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Dorman M39382 Brake Master Cylinder
Reliable Brake Master Cylinder for GM Vehicles
The Dorman M39382 brake master cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models. Designed with dual bore diameters and an aluminum body, this master cylinder ensures consistent brake fluid pressure and durability.
- Includes reservoir for brake fluid
- Dual master cylinder bore diameters: 0.875 inch and 1.25 inch
- Constructed from durable aluminum material
- Five outlet ports for versatile brake line connections
- Rearward outlet sizes: M10 x 1.5 and M12 x 1.0
- Secondary outlet thread diameters: M12 x 1.0 and M16 x 1.5
- Mounting hardware not included
Product Details and Specifications
The Dorman M39382 brake master cylinder features a dual bore design with diameters of 0.875 inch and 1.25 inch, allowing for precise brake fluid pressure modulation. Its aluminum construction provides corrosion resistance and long service life. The included reservoir simplifies installation by providing an integrated fluid container. This master cylinder has five outlets, including rearward outlets sized M10 x 1.5 and M12 x 1.0, and secondary outlet threads of M12 x 1.0 and M16 x 1.5, accommodating various brake line configurations. Note that mounting hardware is not included and must be sourced separately.
Compatible Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac Models
This brake master cylinder is compatible with a range of GM vehicles, including Buick Century, Skylark, and Regal; Cadillac Calais; Chevrolet Cavalier, Celebrity, and Omega; Oldsmobile Cutlass Ciera and Firenza; and Pontiac Grand Am, Sunbird, and J2000 models. The part number M39382 ensures correct fitment for these specific vehicles, making it suitable for brake system repairs and replacements.
Common Applications and Problem Resolution
- Restores brake fluid pressure in vehicles with worn or leaking master cylinders
- Eliminates spongy or unresponsive brake pedal feel
- Replaces master cylinders with damaged or corroded aluminum bodies
- Addresses brake fluid leaks from reservoir or outlet ports
- Supports brake system upgrades requiring multiple outlet connections
Installation Notes and Tips
Before installation, verify compatibility with your vehicle’s make and model using the part number M39382. Since mounting hardware is not included, ensure you have the correct bolts and fittings on hand. Properly bleed the brake system after installation to remove air and restore optimal brake performance. Inspect all brake lines and connections for leaks or damage during installation.
Quality Assurance and Warranty
Dorman manufactures this brake master cylinder to meet or exceed OEM specifications, using corrosion-resistant aluminum for durability. While mounting hardware is not included, the integrated reservoir and precise bore diameters contribute to reliable brake system operation. Please consult Dorman’s warranty policy for coverage details on the M39382 brake master cylinder.
| Brand | Dorman |
|---|---|
| Part Number | M39382 |
| Master Cylinder Bore Diameter | 0.875 |
| Master Cylinder Bore Diameter | 1.25 |
| Master Cylinder Material | Aluminum |
| Mounting Hardware Included | No |
| Number of Outlets | 5 |
| Package Contents | Master Cylinder |
| Rearward Outlet Size | M10 x 1.5; M12 x 1.0 |
| Reservoir Included | Yes |
| Secondary Outlet Thread Diameter | M12 x 1.0; M16 x 1.5 |
| Sensor Included | No |
This part fits 52 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1986 | Buick | Century | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1986 | Buick | Skyhawk | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1986 | Buick | Skylark | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1986 | Cadillac | Cimarron | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1986 | Chevrolet | Cavalier | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1986 | Chevrolet | Celebrity | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1986 | Oldsmobile | Calais | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1986 | Oldsmobile | Cutlass Ciera | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1986 | Oldsmobile | Firenza | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1986 | Oldsmobile | Firenza | 1.8L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1986 | Pontiac | 6000 | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1986 | Pontiac | Grand Am | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1986 | Pontiac | Sunbird | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1985 | Buick | Century | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1985 | Buick | Skyhawk | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1985 | Buick | Skylark | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1985 | Cadillac | Cimarron | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1985 | Chevrolet | Cavalier | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1985 | Chevrolet | Celebrity | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1985 | Chevrolet | Citation II | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1985 | Oldsmobile | Calais | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1985 | Oldsmobile | Cutlass Ciera | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1985 | Oldsmobile | Firenza | 2.0L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1985 | Oldsmobile | Firenza | 1.8L | L4 | N/A | Bore: 7/8 In. and 1.25 In. |
| 1985 | Pontiac | 6000 | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA1 (Light Duty Brakes) | ||
| 1985 | Pontiac | Grand Am | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Buick | Century | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1984 | Buick | Skyhawk | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Buick | Skylark | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1984 | Cadillac | Cimarron | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Chevrolet | Cavalier | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Chevrolet | Celebrity | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1984 | Chevrolet | Citation II | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1984 | Oldsmobile | Cutlass Ciera | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1984 | Oldsmobile | Firenza | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Oldsmobile | Omega | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1984 | Pontiac | 6000 | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1984 | Pontiac | J2000 Sunbird | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1984 | Pontiac | Phoenix | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Buick | Century | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1983 | Buick | Skyhawk | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Buick | Skylark | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Cadillac | Cimarron | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Chevrolet | Cavalier | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Chevrolet | Celebrity | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1983 | Chevrolet | Citation | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1983 | Oldsmobile | Cutlass Ciera | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1983 | Oldsmobile | Firenza | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Oldsmobile | Omega | N/A | Bore: 7/8 In. and 1.25 In.; w/Power or Manual Brakes | ||
| 1983 | Pontiac | 6000 | N/A | Bore: 7/8 In. and 1.25 In.; w/RPO Code JA8 (Medium Duty Brakes); w/RPO Code JA1 (Light Duty Brakes) | ||
| 1983 | Pontiac | J2000 | N/A | Bore: 7/8 In. and 1.25 In. | ||
| 1983 | Pontiac | Phoenix | N/A | Bore: 7/8 In. and 1.25 In. |
* 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:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.