Dorman - First Stop Brake Master Cylinder M390023
Dorman - First Stop Brake Master Cylinder M390023 - view 2
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Dorman - First Stop Brake Master Cylinder M390023 - view 4
Dorman - First Stop Brake Master Cylinder M390023
Dorman - First Stop Brake Master Cylinder M390023 - view 2
Dorman - First Stop Brake Master Cylinder M390023 - view 3
Dorman - First Stop Brake Master Cylinder M390023 - view 4

Dorman - First Stop Brake Master Cylinder P/N:M390023

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$134.99
MPN: M390023
Item Package Code: EA
Part Has Core (Y/N): N
Item Package Quantity: 1
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Dorman - First Stop Brake Master Cylinder P/N:M390023
Dorman - First Stop Brake Master Cylinder P/N:M390023
$134.99

Help keep your brake pedal firm and predictable with the Dorman First Stop Brake Master Cylinder M390023, a new Miata master cylinder that converts pedal effort into hydraulic pressure for the braking system. It installs as a direct-fit replacement for the 1991-1997 Mazda Miata (All engines). Dorman engineered it to match the design, function and performance of the original master cylinder on this application, and built it from new, high-quality materials.

  • Precise replacement: the aluminum cylinder housing is built to match the original part's material for similar performance.
  • Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
  • 100% new: made entirely from new materials for quality and safety.
  • Strict specifications: built to meet rigorous SAE International standards.

Specifications: Bore diameter: 0.875 in · Outlets: 2 · Rearward outlet size: M10 x 1.0 · Secondary outlet thread: M10 x 1.0 · Primary outlet thread pitch: 1 mm · Master cylinder material: aluminum · Reservoir: included · Sensor: included · Mounting hardware: not included. Country of origin: Taiwan.

Signs this Miata brake master cylinder may need replacing include a soft or spongy pedal, a pedal that slowly sinks under steady pressure, or brake fluid seeping from the unit. If diagnosis confirms the master cylinder is the cause, M390023 replaces it. It is sold as one master cylinder, and the listed application uses one.

Interchange: 83-14801 · 100-1812 · M-53801 · 072-8909 · 13-2576 · 11-2576 · 130.45801 · 355-80100
18M559 · M900767 · 12910 · 13892 · MC512330 · M52576 · NA2343400 · NA234340Z · NA234340ZA · NAY34340Z · MC390023 · F123533 · MC123533 · 8314801 · 1001812 · M53801 · 0728909 · 132576 · 112576 · 13045801 · 35580100

This part cross-references / interchanges with the following part numbers:

18M559, 83-14801, M900767, 100-1812, M-53801, 072-8909, 12910, 13892, 13-2576, 11-2576, 130.45801, MC512330, 355-80100, M52576, NA2343400, NA234340Z, NA234340ZA, NAY34340Z, MC390023, F123533, MC123533

Frequently Asked Questions

Which years does this Mazda Miata master cylinder fit?

It is listed for the 1991-1997 Mazda Miata (All engines), with one master cylinder used per vehicle.

Does it come with a reservoir?

Yes, the reservoir and a sensor are both included. Mounting hardware is not, so consult the vehicle service information for the correct fasteners and whether they may be reused.

What is the master cylinder made of?

The cylinder housing is aluminum. All rubber components use a high-quality EPDM compound designed to resist glycol-based brake fluid.

Is this a clutch master cylinder?

No. M390023 is a brake master cylinder that supplies hydraulic pressure to the braking system, not a clutch master cylinder.

Does it need to be bled?

Yes. Bench-bleed the master cylinder before installing it, then bleed the brake system following the vehicle's service information to remove trapped air.

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