Dorman M39489 brake master cylinder for the 1981-1983 Mazda RX-7 turns pedal force into hydraulic pressure for the brakes. This Dorman brake master cylinder is engineered to match the design, function and performance of the original on the vehicle years it covers.
- Part of the Dorman First Stop line
- Cast iron cylinder housing with a 0.813 in bore diameter
- EPDM rubber components resist glycol-based brake fluid
- Made entirely of new materials
- Made to meet rigorous SAE International standards
Quick facts
- Part: Dorman M39489 brake master cylinder
- Fits: 1981-1983 Mazda RX-7
- Material: Cast iron
- Condition: New
A soft or sinking brake pedal, fluid around the cylinder or a brake warning light can mean the master cylinder is wearing out. These signs alone do not prove it is the problem, since a leaking brake line is another common cause. Have brake problems looked at promptly.
Fits
This master cylinder fits the 1981-1983 Mazda RX-7.
Specifications
Fit and size
- Quantity per vehicle: 1
- Bore diameter: 0.813 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. This listing holds one master cylinder, and the 1981-1983 Mazda RX-7 takes one. Mounting hardware is not included, so plan on new hardware, since the old pieces may not be reusable.
Interchange: 83-14103 · 100-1720 · M-53103 · 072-8108 · 13-1962 · 11-1962 · 130.45103 · 355-80005
18M266 · M900468 · 11941 · 11962 · MC510760 · M51962 · FA1843400 · F107335 · F108037 · MC108037
This part cross-references / interchanges with the following part numbers:
18M266, 83-14103, M900468, 100-1720, M-53103, 072-8108, 11941, 11962, 13-1962, 11-1962, 130.45103, MC510760, 355-80005, M51962, FA1843400, F107335, F108037, MC108037
Frequently Asked Questions
Is Dorman M39489 the right Mazda RX-7 brake master cylinder for the 1981-1983 model years?
Yes. Dorman M39489 is listed for the 1981-1983 Mazda RX-7, which takes one master cylinder.
Does this Dorman master cylinder come with the reservoir?
Yes. Dorman M39489 includes the reservoir and a sensor. Mounting hardware is not included.
What are the outlet thread sizes on this brake master cylinder?
The rearward outlet is M10 x 1.0 and the secondary outlet thread diameter is M10 x 1.0, with a 1 mm primary outlet thread pitch. This master cylinder has two outlets and a 0.813 in bore.
Are the rubber parts in this master cylinder made for glycol-based brake fluid?
Yes. All rubber components are made of EPDM compound, which resists glycol-based brake fluid. The cylinder housing is cast iron.
Does Dorman M39489 replace number 18M266?
Yes. 18M266 is one of the numbers Dorman M39489 replaces; the other cross-reference numbers are on the Interchange line.
