Turn brake-pedal effort into the hydraulic pressure that actuates your brakes with the Dorman – First Stop Brake Master Cylinder (M39996). It installs as a direct-fit replacement for the 1989-1995 Toyota 4Runner [All], 1989-1995 Toyota Pickup [All], 1993-1994 Toyota Land Cruiser [All], and 1993-1994 Toyota T100 [All].
This unit is precision-built with 100% new materials to reproduce the design and function of the original master cylinder on the listed applications. If a failing master cylinder is the cause of a slowly sinking or spongy brake pedal, this replaces it.
- Cast-iron housing: constructed to match the casting material of the original part for similar performance.
- EPDM rubber components: all rubber parts use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Two outlets: M10 x 1.0 rearward/secondary outlet thread with a 1 mm primary outlet thread pitch and a 1-inch bore diameter.
- 100% new, not remanufactured: made to meet rigorous SAE International standards.
Includes the reservoir and a sensor. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Manufacturer part number M39996.
Frequently Asked Questions
What vehicles does this master cylinder fit?
It's a direct-fit replacement for the 1989-1995 Toyota 4Runner and Pickup, plus the 1993-1994 Toyota Land Cruiser and T100 (all engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it include a reservoir and sensor?
Yes. Per the catalog, this master cylinder includes the reservoir and a sensor. Mounting hardware is not included.
What is it made of?
The cylinder housing is cast iron, constructed to match the casting material of the original part, and all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
What are the outlet and bore specifications?
It has two outlets with an M10 x 1.0 rearward/secondary outlet thread and a 1 mm primary outlet thread pitch, along with a 1-inch bore diameter.
How do I know if my master cylinder needs replacing?
Signs it may need replacing include a brake pedal that slowly sinks under steady pressure or feels spongy. Diagnose the cause before replacing, as other components can produce similar symptoms.