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Dorman - First Stop Brake Master Cylinder P/N:M390420
$160.99
Put dependable hydraulic muscle back behind your brake pedal with the Dorman - First Stop Brake Master Cylinder M390420. It converts the force you apply at the pedal into the hydraulic pressure that operates the vehicle's brake circuits, and it drops in as a direct-fit replacement for the 1997-1998 Mazda Protege.
- Core job: Pressurizes brake fluid from the pedal input to actuate the wheel-end braking components through the brake lines.
- Direct-fit application: Built to replace the original master cylinder on the listed Mazda Protege years.
- Addresses common failures: If a worn or internally leaking master cylinder is the cause of a low, sinking, or spongy brake pedal, this unit replaces it.
- Diagnose first: A soft pedal can also come from air in the lines, worn friction parts, or a fluid leak elsewhere — confirm the cause before replacing.
Bench-bleed the new cylinder and bleed the brake system per the service procedure after installation.
Interchange: 83-14415 · 8314415 · M901348 · 100-4455 · 1004455 · M-53415 · M53415 · 13482 · 13-2875 · 132875 · 11-2875 · 112875 · 130.45415 · 13045415 · MC510270 · 355-80068 · 35580068 · M55183 · BG3K43400 · BG3K4340Z · MC390420 · F141742
This part cross-references / interchanges with the following part numbers:
83-14415, M901348, 100-4455, M-53415, 13482, 13-2875, 11-2875, 130.45415, MC510270, 355-80068, M55183, BG3K43400, BG3K4340Z, MC390420, F141742, MC141742
Frequently Asked Questions
What does this master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending brake fluid through the lines to operate the vehicle's braking components.
Will it fit my vehicle?
It is a direct-fit replacement for the 1997-1998 Mazda Protege. Check the Buyer's Guide tab to confirm it matches your specific vehicle.
What are signs this part may need replacing?
A low, sinking, or spongy brake pedal can be a sign of a worn or internally leaking master cylinder. Diagnose the cause first, since other issues can produce the same symptoms.
Do I need to bleed it after installing?
Yes. Bench-bleed the master cylinder before installation, then bleed the brake system per the service procedure to remove trapped air.
What is the manufacturer part number?
The manufacturer part number is M390420 from Dorman - First Stop. It replaces the interchange numbers listed in the description.
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Dorman - First Stop Brake Master Cylinder P/N:M390420
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