Dorman M39791 Brake Master Cylinder

Name: Dorman M39791 Brake Master Cylinder
Brand: Dorman
SKU: BKKX-M39791
Price: 96.12 USD
Availability: InStock

N/A

24 vehicles fit this part

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OE Direct Replacement — Bolt-on fit, no modifications needed

Fitment: Nissan, Pickup, D21, and Pathfinder

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Reliable Brake Master Cylinder for Nissan D21, Pathfinder, and Pickup

The Dorman M39791 brake master cylinder is engineered to restore proper brake hydraulics for Nissan D21, Pathfinder, and Pickup models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent braking performance.

Key Features of the Dorman M39791 Brake Master Cylinder

Constructed from durable aluminum for corrosion resistance and longevity
Includes an integrated reservoir for brake fluid management
Equipped with a sensor to monitor brake system status
Master cylinder bore diameter of 0.938 inches for accurate hydraulic pressure
Three outlet ports with a rearward outlet size of M10 x 1.0 and secondary outlet thread diameter of 10 mm
Thread pitch of 1.0 for secure fitting
Package contains the master cylinder unit; mounting hardware not included

Detailed Product Description

The Dorman M39791 brake master cylinder is specifically designed for Nissan D21, Pathfinder, and Pickup vehicles, providing a direct replacement for the original equipment. Its aluminum construction offers enhanced durability and resistance to wear, while the included reservoir simplifies brake fluid maintenance. The integrated sensor allows for real-time monitoring of brake system conditions, contributing to vehicle safety. With a bore diameter of 0.938 inches and three outlets, this master cylinder supports efficient brake fluid distribution. The precise thread pitch and outlet sizes ensure compatibility with the vehicle’s brake hydraulics system.

Common Brake Issues Addressed by This Master Cylinder

Brake pedal sinking or sponginess due to internal leaks
Loss of hydraulic pressure affecting braking efficiency
Brake fluid reservoir leaks or damage
Faulty brake system sensor triggering warning lights
Corrosion or wear in the original master cylinder impacting performance

Installation Notes and Tips

Ensure compatibility with Nissan D21, Pathfinder, or Pickup models before installation
Bleed the brake system thoroughly after installation to remove air pockets
Use appropriate brake fluid as specified by the vehicle manufacturer
Mounting hardware is not included; reuse existing hardware or acquire separately
Check sensor connections carefully to maintain brake system monitoring

Quality Assurance and Warranty Information

Dorman manufactures the M39791 brake master cylinder to meet or exceed OEM standards for fit, form, and function. Each unit undergoes rigorous quality control to ensure reliability and safety. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to the product documentation for exact warranty terms.

Brand	Dorman
Part Number	M39791
Master Cylinder Bore Diameter	0.938
Master Cylinder Material	Aluminum
Mounting Hardware Included	No
Number of Outlets	3
Package Contents	Master Cylinder
Rearward Outlet Size	M10 X 1.0
Reservoir Included	Yes
Secondary Outlet Thread Diameter	10
Sensor Included	Yes
Thread Pitch	1.0

This part fits 24 vehicles. Search below:

Year	Make	Model	Body Type	Drive Type	Liters	Cylinders	Position	Notes
1997	Nissan	Pickup	Standard Cab Pickup	4WD			N/A
1996	Nissan	Pickup	Standard Cab Pickup	4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Nissan	D21		RWD	2.4L	L4	N/A	Fits models up to January 1992 with a 15/16 inch bore.
1991	Nissan	D21		RWD	2.4L	L4	N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1990	Nissan	D21		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1990	Nissan	D21		RWD	2.4L	L4	N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1990	Nissan	Pathfinder		RWD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1990	Nissan	Pathfinder		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1989	Nissan	D21		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1989	Nissan	D21		RWD	2.4L	L4	N/A	Exc. Heavy Duty Brakes; Bore: 15/16 In.
1989	Nissan	D21		RWD			N/A	Heavy Duty Brakes; w/Dual Rear Wheels (DRW); Bore: 15/16 In.
1989	Nissan	Pathfinder		RWD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1989	Nissan	Pathfinder		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1988	Nissan	D21		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1988	Nissan	D21		RWD	2.4L	L4	N/A	Exc. Heavy Duty Brakes; Bore: 15/16 In.
1988	Nissan	Pathfinder		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1987	Nissan	D21		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1987	Nissan	D21		RWD	2.4L	L4	N/A	Exc. Heavy Duty Brakes; Bore: 15/16 In.
1987	Nissan	Pathfinder		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1986	Nissan	D21	Standard Cab Pickup	RWD			N/A	Exc. Heavy Duty Brakes; Bore: 15/16 In.
1986	Nissan	D21	Cab & Chassis	RWD			N/A	Exc. Heavy Duty Brakes; Bore: 15/16 In.
1986	Nissan	D21		4WD			N/A	Fits 15/16" bore size drum brakes on multiple vehicle models.
1986	Nissan	D21		RWD			N/A	Heavy Duty Brakes; w/Dual Rear Wheels (DRW); Bore: 15/16 In.
1986	Nissan	Pickup					N/A	Fits vehicles with Single Rear Wheel (SRW) and excludes Heavy Duty models.

* 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:

072-856011-22581228713-2258130.4230918M330460101S700783-04309F115588M-51309M52258M900536MC117263MC39594

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