Miyaco MC-M301 clutch master cylinder with reservoir for right-hand-drive Mazda MX-5 Mk1 / NA, Mk2 / NB and Mk2.5 / NB-FL manual-transmission models from 1989–2005.
This complete clutch master cylinder replaces Mazda OE reference B425-41-400. Mounted through the engine-bay bulkhead and mechanically connected to the clutch pedal, the master cylinder converts pedal movement into hydraulic pressure which is transmitted through the clutch pipe and flexible hose to operate the clutch slave cylinder.
MC-M301 is supplied as a complete replacement clutch master cylinder with fluid reservoir rather than an internal repair kit. One master cylinder is required per vehicle.
Application / fitment advice:
- Mazda MX-5 Mk1 / NA, Mk2 / NB and Mk2.5 / NB-FL applications.
- Right-hand-drive vehicles only.
- Manual-transmission vehicles only.
- Not suitable for automatic-transmission applications.
- Replaces Mazda OE clutch master cylinder reference B425-41-400.
Part location:
The clutch master cylinder is mounted through the bulkhead in the engine bay and connects to the clutch pedal inside the cabin. Hydraulic pressure generated by the master cylinder operates the clutch slave cylinder when the pedal is depressed.
Installation / service notes:
- Protect surrounding painted surfaces before opening the hydraulic system, as brake / clutch fluid can damage vehicle paintwork.
- Check the hydraulic pipe connection, flexible clutch hose and slave cylinder for leakage or deterioration while the system is open.
- After installation, refill with the vehicle-specified hydraulic fluid and bleed the clutch hydraulic circuit thoroughly to remove trapped air.
- Check for leaks and confirm correct clutch disengagement and a consistent pedal feel before driving the vehicle.
Other items to consider:
- Clutch slave / release cylinder
- Flexible clutch hydraulic hose
- Fresh hydraulic fluid
- Hydraulic pipework and fittings where corroded or damaged
Why Miyaco?
Miyaco specialises in automotive brake and hydraulic service components and produces a broad range of replacement master cylinders, slave cylinders and related hydraulic parts for Japanese vehicle applications.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 / Eunos Roadster | Mk1 / NA – 1.6 | NA6C / NA6CE | 1989–1993 | 115 | B6-ZE | Petrol | 5-speed manual | RHD only |
| Mazda | MX-5 / Eunos Roadster | Mk1 / NA – 1.6 | NA6C / NA6CE | 1994–1998 | 90 | B6-ZE | Petrol | 5-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk1 / NA – 1.8 | NA8C | 1994–1998 | 131 | BP-ZE | Petrol | 5-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk2 / NB – 1.6 | NB6C | 1998–2002 | 110 | B6-ZE | Petrol | 5-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk2 / NB – 1.8 | NB8C | 1998–2002 | 140 | BP / BP-ZE | Petrol | 5-speed / 6-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk2.5 / NB-FL – 1.6 | NB6C | 2002–2005 | 110 | B6-ZE | Petrol | 5-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk2.5 / NB-FL – 1.8 VVT | NB8C | 2002–2005 | 146 | BP-Z3 / BP6J | Petrol | 5-speed / 6-speed manual | RHD only |
| Mazda | MX-5 / Roadster | Mk2.5 / NB-FL – 1.8 Turbo | NB8C | 2004–2005 | 178 | BP-T | Petrol | 6-speed manual | RHD only |
| Reference Type | Manufacturer | Reference | Notes |
|---|---|---|---|
| Product Reference | Miyaco | MC-M301 | Clutch master cylinder with reservoir |
| OE Reference | Mazda | B425-41-400 | Genuine Mazda clutch master cylinder reference |
| OE Reference Format | Mazda | B42541400 | Unhyphenated format of B425-41-400 |