Clutch Master Cylinder 8-97136445 8971364450 For ISUZU D-MAX TFR TFS Pickup (1997–2003) — Ø15.87mm Bore, Cast Iron Body, M12×1.0 Outlet, 60mm Mounting

The Clutch Master Cylinder with OEM references 8-97136445 / 8971364450 (factory number 8-97136-445-0) is a verified direct-fit hydraulic component for the ISUZU D-MAX (TFR/TFS) pickup platform from 1997–2003, covering engines including 4JA1 (2.5L diesel), 4JB1 (2.8L diesel), 4ZD1 (2.3L petrol), and 4ZC1. This cylinder is the hydraulic pressure generator at the top of the clutch actuation system — it converts clutch pedal force into hydraulic pressure that travels through the clutch line to the slave cylinder, disengaging the clutch for gear changes.

The master cylinder is defined by its Ø 15.87 mm bore, 60 mm mounting hole spacing, and M12 × 1.0 outlet thread. It is manufactured from cast iron, a material choice that provides dimensional stability and resistance to the high pressures and thermal cycling of the clutch hydraulic circuit. The reference weight is approximately 0.896–0.96 kg depending on the brand and whether a reservoir is included.

• Bore Diameter Verified: Ø 15.87 mm — confirmed by RIDEX 234M0013 ("Diametro: 15,87"), BREMBO/JAPANPARTS data ("Diameter: 15,87"), and Dorman CM118501 ("Inside Diameter: 0.625 in" ≈ 15.87 mm).
• Mounting & Thread Verified: 60 mm mounting bore distance, 2 mounting holes, 1× M12 × 1.0 outlet thread — confirmed by RIDEX 234M0013 and BREMBO/JAPANPARTS specifications.
• Material Verified: Cast Iron (Hierro fundido / Gusseisen / Fonte) — confirmed by RIDEX and BREMBO/JAPANPARTS data.
• Weight Verified: 0.896 kg (RIDEX) / 0.96 kg (BREMBO/JAPANPARTS alternate) — consistent range depending on brand.
• Vehicle Coverage Verified: ISUZU TFR/TFS Pick-up (09.1988–08.1999) per RIDEX; ISUZU (GM) Pick-up TFS 4x4 1997–2003, TFS54 2.5 TD diesel 1998–2003 per Euro4x4parts. D-MAX I TFR TFS 2.5L 2002–2003 confirmed by Frankberg compatibility data.
• Engine Coverage Verified: 4ZC1, 4ZD1, 4ZE1, 4JA1, 4JB1 — confirmed by PartSouq ISUZU parts catalogue for the 8-97136-445-0 reference.
• Cross-Reference Density Verified: 8-97136445, 8-97136-445-0, 8971364450, 97136445, 8-97201-007-0, 8971372612, 97110222, 97185018 are consistently grouped across Euro4x4parts, RIDEX, Dorman, Frankberg, and Blue Print catalogs.
• Brand Cross-Reference Verified: Blue Print ADG03410, RIDEX 234M0013, TRW PNB198, BREMBO, JAPANPARTS, A.B.S. 71759, Dorman CM118501, Frankberg — all confirmed as aftermarket equivalents to OE 8-97136445.

• Clutch pedal sinks to the floor or feels spongy: Internal seal failure allows hydraulic pressure to bypass, preventing full clutch disengagement — the most common symptom of a failing master cylinder.
• Difficulty selecting gears / gear clash: Insufficient hydraulic pressure means the clutch does not fully disengage, causing hard shifting and gear grinding.
• Fluid leak at the master cylinder body or pushrod end: External seal failure allows clutch fluid to escape, often visible as wetness under the dashboard or on the firewall.
• Fluid level dropping in the clutch reservoir without an external leak: Internal seal bypass can allow fluid to enter the pushrod boot area or the cabin.
• Clutch pedal does not return fully: A worn internal spring or seal can prevent the pedal from returning to its rest position.
• Contaminated or dark clutch fluid: Degraded fluid accelerates seal wear and can indicate internal master cylinder degradation.

• Bore diameter is the first check: This master cylinder is Ø 15.87 mm. Some aftermarket listings show 16 mm or 22 mm bore variants — these are not interchangeable without confirming the original unit's specification. Measure the original cylinder or provide the VIN.
• D-MAX I (2002–2003) vs. TFR (1997–1999): The same master cylinder reference covers both the late TFR and early D-MAX I applications. However, production changes across the model transition may affect the reservoir configuration or pushrod length. Confirm the vehicle's exact model year and original part marking.
• Reservoir inclusion varies: Some supply channels provide the master cylinder with a brake fluid reservoir, while others supply the cylinder only. Confirm package contents at inquiry — a missing reservoir means the vehicle cannot be bled and returned to service until one is sourced.
• Cross-brand Opel/Vauxhall/Holden coverage: The OPEL/VAUXHALL/HOLDEN references confirm this master cylinder is used on Campo, Brava, Frontera, and Rodeo variants. This makes it a cross-brand SKU for distributors serving both ISUZU and GM/Opel light commercial fleets.

1. Confirm the required part first: Verify the original master cylinder's bore diameter (Ø 15.87 mm), mounting hole distance (60 mm), and outlet thread (M12 × 1.0). Confirm whether a reservoir is included or must be reused.
2. Bench-bleed the master cylinder (recommended): Clamp the cylinder in a vice with soft jaws and bleed it on the bench before installation to reduce in-vehicle bleeding time.
3. Disconnect the battery and hydraulic line: Disconnect the negative battery terminal. Place a drain pan underneath, disconnect the clutch line from the master cylinder outlet, and plug the line immediately to prevent contamination.
4. Remove the old master cylinder: From inside the cabin, remove the clevis pin connecting the pushrod to the clutch pedal. From the engine bay, unbolt the master cylinder from the firewall or pedal bracket.
5. Transfer the reservoir (if applicable): If the replacement is supplied without a reservoir, carefully transfer the original reservoir and seals.
6. Install the new master cylinder: Position the 8-97136445 cylinder, insert the mounting bolts, and torque to the workshop manual specification. Do not over-torque the hydraulic line fitting.
7. Reconnect the pushrod and hydraulic line: Reconnect the clevis pin to the clutch pedal. Connect the hydraulic line to the M12 × 1.0 outlet and tighten to specification.
8. Bleed the clutch system: Fill the reservoir with the specified clutch fluid and bleed the system according to the ISUZU procedure until clear, bubble-free fluid flows from the slave cylinder bleeder screw. Air in the circuit is the leading cause of post-replacement clutch drag.
9. Test operation: With the engine running, depress the clutch pedal and verify smooth gear engagement in all gears. The pedal should return fully and the vehicle should not creep when a gear is selected with the clutch depressed.

• Inspect clutch fluid level at every engine oil change — a dropping level indicates a leak that requires immediate attention.
• Flush clutch fluid every 2 years or according to ISUZU schedule — degraded fluid accelerates seal wear in both the master and slave cylinders.
• Check for leaks at the master cylinder body, outlet fitting, and reservoir seal during routine inspection.
• Replace the master cylinder at the first sign of a spongy pedal or external leak — do not "top up and monitor" a known-failing hydraulic component on a commercial pickup.

• Standard packing: Neutral carton or customer-requested packaging.
• Package contents: 1 × Clutch Master Cylinder. Reservoir inclusion varies — confirm at inquiry. Mounting hardware, pushrod, and clutch fluid are not included unless explicitly stated.
• Set options: Cylinder only / cylinder + reservoir (where available) — specify at inquiry.
• Suitable for: ISUZU D-MAX / TFR / TFS clutch repair shops, Opel Campo / Vauxhall Brava / Frontera service providers, light commercial fleet maintenance departments, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, Latin America, and Europe.
• Related parts available: Clutch slave cylinder, clutch disc, pressure plate, release bearing, clutch fluid, and complete TFR/D-MAX clutch hydraulic service kits.