Dorman M39846 brake master cylinder for the 1988 Toyota 4Runner and other vehicles turns pedal force into hydraulic pressure for the brakes.
- Cast iron cylinder housing
- All rubber components are EPDM compound, which resists glycol-based brake fluid
- Made entirely of new materials
- Made to meet SAE International standards
- Reservoir and sensor included
Quick facts
- Part: Dorman M39846 brake master cylinder
- Fits: 1988 Toyota 4Runner and other vehicles
- Material: Cast iron
- Condition: New
A soft or sinking brake pedal, brake fluid around the cylinder or a brake warning light can mean the master cylinder is worn. Worn calipers, wheel cylinders, brake hoses or a leaking line can be behind those signs too, so find out which one it is before you buy. If the master cylinder is the cause, this unit replaces it.
Fits
It is a direct-fit replacement for the 1988 Toyota 4Runner and the 1988 Toyota Pickup.
Specifications
Fit and size
- Quantity per vehicle: 1
- Bore diameter: 0.938 in
- Number of outlets: 2
- Rearward outlet size: M10 x 1.0
- Secondary outlet thread diameter: M10 x 1.0
- Primary outlet thread pitch: 1 mm
Build and materials
- Material: Cast iron
- Rubber components: EPDM compound
- Reservoir: included
- Sensor: included
- Condition: New
- Country of origin: Taiwan
In the box
One master cylinder with its reservoir and sensor. Mounting hardware is not included, so plan on new hardware. This listing holds one master cylinder, and the 1988 Toyota 4Runner and the 1988 Toyota Pickup take one.
Interchange: 100-1622 · 072-8371 · 072-8994 · 13-2443 · 11-2443 · 130.44406 · 355-76085
18M458 · M900665 · MC511010 · 4720135600 · F120609 · MC120609
This part cross-references / interchanges with the following part numbers:
18M458, M900665, 100-1622, 072-8371, 072-8994, 13-2443, 11-2443, 130.44406, MC511010, 355-76085, 4720135600, F120609, MC120609
Frequently Asked Questions
Is this the 4Runner master cylinder for a 1988 Toyota 4Runner?
Yes. Dorman M39846 is a direct-fit replacement for the 1988 Toyota 4Runner and the 1988 Toyota Pickup, and both take one.
Does this Dorman brake master cylinder come with the reservoir and sensor?
Yes. Dorman M39846 includes the reservoir and the sensor. Mounting hardware is not included.
What size are the outlet threads on this master cylinder?
The rearward outlet and the secondary outlet thread are both M10 x 1.0, and the primary outlet thread pitch is 1 mm. The bore diameter is 0.938 inch.
What signs can point to a worn brake master cylinder?
A soft or sinking pedal, brake fluid near the cylinder or a brake warning light can point to it. A shop can test the brake system to confirm.
Are the rubber parts in this Dorman master cylinder made for glycol-based brake fluid?
Yes. All rubber components are made of EPDM compound, which resists glycol-based brake fluid.
