Genuine Mazda Clutch Master Cylinder • NA8W-41-400

Genuine Mazda NA8W-41-400 Clutch Master Cylinder

Replacement Genuine Mazda clutch master cylinder for Mazda MX-5 Mk4 ND and RF manual-transmission models from 2015 onwards listed in the compatibility table.

The clutch master cylinder converts movement from the clutch pedal into hydraulic pressure. This pressure is transferred through the clutch hydraulic pipework to the slave cylinder, allowing the clutch to disengage smoothly when selecting gears or bringing the vehicle to a stop.

The cylinder is mounted at the vehicle bulkhead and connects mechanically to the clutch pedal. There is typically one clutch master cylinder fitted per vehicle. This listing is for one Genuine Mazda clutch master cylinder.

Internal seal wear, corrosion or hydraulic-fluid leakage can cause a soft or sinking clutch pedal, inconsistent pedal return, incomplete clutch disengagement, difficulty selecting gears or visible fluid loss around the cylinder and surrounding pipework.

• Part type: Clutch master cylinder
• Primary use: Generates hydraulic pressure to operate the clutch release system
• Location: Vehicle bulkhead, connected to the clutch pedal and clutch hydraulic pipework
• Position: Clutch hydraulic control system
• Quantity per vehicle: 1
• Quantity supplied: 1 clutch master cylinder
• Brand: Genuine Mazda
• Part No.: NA8W-41-400
• Also referenced as: NA8W41400
• Fitment note: For confirmed Mazda MX-5 Mk4 ND and RF manual-transmission applications only

Fitment advice: This clutch master cylinder is intended for manual-transmission Mazda MX-5 ND and RF models. It is not suitable for automatic-transmission vehicles. For imported, modified or previously repaired cars, matching the original cylinder layout, pedal connection, hydraulic fitting and part number is recommended.

Other items to consider: When changing this part, you may also want to consider purchasing the clutch slave cylinder, flexible hydraulic hose, hydraulic-pipe sealing components and fresh brake/clutch fluid. Inspect the clutch pedal linkage and hydraulic pipework for wear, corrosion or leakage.

Useful tools / consumables: Flare-nut spanners, socket set, extensions, pliers, fluid-catching container, protective gloves, eye protection, brake cleaner, fresh manufacturer-specified hydraulic fluid and suitable clutch-bleeding equipment.

Difficulty guide: DIY Difficulty: Moderate. Installation requires access around the clutch pedal and bulkhead, careful disconnection of the hydraulic line and complete bleeding of the clutch hydraulic system. Hydraulic fluid can damage painted surfaces and should be cleaned away immediately.

Why Genuine Mazda? Genuine Mazda clutch hydraulic components are designed to match the original cylinder bore, pedal linkage, bulkhead mounting points and hydraulic connections. Correct internal specification and seal quality help maintain consistent hydraulic pressure, smooth clutch release operation and compatibility with the original slave cylinder and clutch system.

What’s in the box: One Genuine Mazda clutch master cylinder, part number NA8W-41-400.

Installation notes: Protect painted surfaces before disconnecting the hydraulic line. Remove the pedal connection and cylinder mounting hardware, then install the replacement cylinder in the original orientation. Reconnect the hydraulic line carefully without cross-threading the fitting, refill the system with the specified fluid and bleed it until the pedal is firm and free from trapped air. Check all connections for leakage and confirm complete clutch disengagement before driving.