Put a 100% new Dorman First Stop Brake Master Cylinder, part number M390034, to work turning pedal effort into hydraulic brake pressure. This brake master cylinder is a direct-fit replacement for the 1990-1997 Mazda Miata, all engines. It is engineered with precision to mirror the design, function, and performance of the original master cylinder, and it is built from new, high-quality materials.
The master cylinder pushes brake fluid through the lines to the wheels each time you press the pedal. Signs that the master cylinder may need replacing include a spongy pedal, a pedal that slowly sinks under steady pressure, or fluid seeping around the unit. Diagnose the cause first, because other brake components can produce similar symptoms.
- Precise replacement: The aluminum cylinder housing is built to match the casting material of the original part for similar performance.
- Durable design: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: Made entirely of new materials.
- Strict specifications: Built to meet rigorous SAE International standards.
Specifications: 3 outlets, 0.875-inch bore diameter, M10 x 1.0 rearward and secondary outlet threads, and a 1 mm primary outlet thread pitch. The reservoir and sensor are included. Mounting hardware is not included. Country of origin: Taiwan.
Interchange: 83-14800 · 100-1811 · M-53800 · 072-8591 · 13-2512 · 11-2512 · 130.45800 · 355-80099
8314800 · 1001811 · M53800 · 0728591 · 132512 · 112512 · 13045800 · 35580099 · 18M570 · M900778 · 12535 · MC250860 · M52512 · NM52512 · NA0143400B · NA0143400D · NA014340Z · MC390034 · F120603 · MC120603
This part cross-references / interchanges with the following part numbers:
18M570, 83-14800, M900778, 100-1811, M-53800, 072-8591, 12535, 13-2512, 11-2512, 130.45800, MC250860, 355-80099, M52512, NM52512, NA0143400B, NA0143400D, NA014340Z, MC390034, F120603, MC120603
Frequently Asked Questions
Is this the right master cylinder for a 1990-1997 Mazda Miata?
If you need the brake master cylinder, yes. It is listed for the 1990-1997 Mazda Miata, all engines, but it is not a clutch master cylinder.
Does it come with a reservoir?
Yes, the reservoir and sensor are included. Mounting hardware is not included, so check the vehicle service information for the correct fasteners.
What are the outlet and bore specifications?
It has 3 outlets with M10 x 1.0 rearward and secondary outlet threads and a 1 mm primary outlet thread pitch. The bore diameter is 0.875 inch.
What are the rubber components made of?
All of the rubber components are made from a high-quality EPDM compound, which resists glycol-based brake fluid.
What signs suggest a master cylinder may need replacing?
Possible signs include a spongy pedal, a pedal that slowly sinks under steady pressure, or fluid leaking at the unit. Diagnose the cause first, because other brake parts can cause similar symptoms.
