RIDEX Clutch Slave Cylinder – MX-5 Mk1 NA / Mk2 NB 1.6 & 1.8 • 620S0029

RIDEX 620S0029 Clutch Slave Cylinder – MX-5 Mk1 NA / Mk2 NB 1.6 & 1.8

Replacement RIDEX hydraulic clutch slave cylinder for Mazda MX-5 Mk1/NA and Mk2/NB / Mk2.5/NB-FL manual-transmission models.

The clutch slave cylinder converts hydraulic pressure from the clutch master cylinder into mechanical movement at the clutch release mechanism. A worn or leaking slave cylinder can prevent the clutch from disengaging fully and may leave the clutch pedal soft, low or unable to return normally.

MX-5 fitment: RIDEX confirms this exact cylinder for MX-5 NA models from 1990–1998 and MX-5 NB models from 1998–2005, covering 90–146 PS petrol applications. This includes the naturally aspirated 1.6 and 1.8 variants. The 1.8i Turbo is excluded because RIDEX's exact-SKU application data ends at 146 PS. :contentReference[oaicite:0]{index=0}

• Part type: Hydraulic clutch slave cylinder
• Material: Cast iron
• Bore diameter: 19.05 mm
• Number of mounting bores: 2
• Mounting bore spacing: 52 mm
• Hydraulic thread: M10 × 1
• Inlet thread: M10 × 1
• Number of fluid / oil bores: 1
• Approximate weight: 0.46 kg
• EAN: 4059191359004
• Quantity supplied: 1 clutch slave cylinder
• Brand: RIDEX
• Part No.: 620S0029

Common replacement reasons: Hydraulic-fluid leakage around the slave-cylinder boot, soft or spongy clutch pedal, clutch pedal remaining near the floor, difficulty selecting gears, incomplete clutch disengagement or repeated loss of hydraulic pressure.

Other items to inspect: Check the clutch master cylinder, hydraulic hose and hard line, release fork and clutch assembly. If hydraulic fluid has been lost, inspect the complete system for additional leaks rather than assuming the slave cylinder is the only fault.

Useful tools / consumables: Spanner and socket set, flare-nut spanner for the hydraulic connection, brake/clutch fluid of the correct specification, bleed hose and container, penetrating fluid and torque wrench.

Difficulty guide: DIY Difficulty: Moderate. The cylinder itself is externally mounted, but the clutch hydraulic circuit must be bled correctly after installation to remove trapped air.

Why RIDEX? RIDEX clutch hydraulic components provide a cost-effective aftermarket replacement manufactured to application-specific dimensions. This cast-iron cylinder uses a 19.05 mm bore and OE-style M10 × 1 hydraulic connection.

What’s in the box: One RIDEX 620S0029 clutch slave cylinder. Hydraulic fluid, hose, master cylinder and clutch components are not included.

Installation notes: Protect painted surfaces from hydraulic fluid and clean the area around the connection before dismantling. Disconnect the hydraulic line, remove the original slave cylinder and compare the mounting arrangement with the replacement. Install the new cylinder, tighten the hydraulic connection and mounting bolts to the applicable specification, refill the reservoir and bleed the clutch hydraulic system until all air is removed. Check carefully for leaks and confirm normal clutch disengagement before road use.