Rear Left Brake Wheel Cylinder 8-97349707-0 8973497070 For ISUZU NPR NQR NRR N-Series 4HK1-T — OEM Verified Direct Fit, 1-3/16" Bore Cast Iron, Rear Left Forward

8-97349707-0 / 8973497070 Rear Left Forward Brake Wheel Cylinder for ISUZU NPR, NQR, NRR and N-Series trucks equipped with the 4HK1-T diesel engine (2003–2018). Precision-honed 1-3/16" (30.16–30.18 mm) bore, cast iron body, EPDM seals, and verified OEM direct fit.

The Rear Left Forward Brake Wheel Cylinder with OEM numbers 8-97349707-0 / 8973497070 is a verified direct-fit replacement for ISUZU NPR, NQR, NRR and N-Series trucks equipped with the 4HK1-T diesel engine. This wheel cylinder is a critical hydraulic component of the rear drum brake system, converting hydraulic pressure from the master cylinder into mechanical force that pushes the brake shoes against the drum to slow or stop the vehicle.

The 4HK1-T is a 5.2L turbocharged diesel engine widely used in Isuzu medium-duty commercial trucks from 2003 to 2018, including the NPR, NQR, NRR and N-Series platforms, as well as Chevrolet/GMC W-Series low cab forward trucks sharing the same platform. This wheel cylinder is the rear left forward (driver side, front position) component, designed for vehicles equipped with rear drum brakes. It is the paired counterpart to the rear left rearward and rear right wheel cylinders within the N-Series rear brake family.

• Bore Diameter Verified: 1-3/16 in (30.16 mm / 30.18 mm). Dorman (W610183) lists 1.1875 in (30.16 mm); Raybestos (WC370247) lists 30.18 mm (1.188"); Blue Print (ADZ94415) and LPR (5372) list 30 mm piston diameter.
• Position Verified: Rear Left Forward (Driver Side, Front Position). Dorman lists "Rear Left Forward", Raybestos lists "Rear Driver Side Forward", GM parts catalog lists "Rear Left Forward".
• Material & Construction: Cast iron body with EPDM rubber cups and boots — confirmed by Dorman, Blue Print and LPR specifications.
• Thread Specification: M10 × 1.0 inlet thread — confirmed by Dorman (Thread Diameter: 10 mm, Thread Pitch: 1.0) and LPR (10 × 1).
• Bleeder Screw: Not included — Dorman confirms "Bleeder Screw Included: No". Note: some aftermarket variants (e.g., certain BGF listings) may include a bleeder — confirm at inquiry.
• Weight Verified: 1.250 kg — confirmed by Blue Print (ADZ94415) specification.
• OEM Cross-Reference Verified: Primary 8-97349707-0 / 8973497070. Alternate ISUZU references include 8-97349-707-0 and 97349707. International brand cross-references include Dorman W610183, Raybestos WC370247, Blue Print ADZ94415, LPR 5372, ASHIKA 67-09-919, JAPANPARTS CS-919 and BGF W610183.
• Paired Counterpart: Blue Print lists ADZ94416 as the paired article number (rear right counterpart).

• Brake fluid leak at wheel: Visible wetness around the backing plate or inside the brake drum — indicates seal failure and imminent braking loss.
• Spongy or long-travel brake pedal: Pedal sinks further than normal and feels soft — air enters the system through a failed seal, reducing hydraulic pressure.
• Uneven braking or vehicle pull: Vehicle pulls to one side during braking — one wheel cylinder is not applying equal force, causing imbalance.
• Brake fade or overheating drums: Extended stopping distances and hot brake drums — a failing cylinder may cause dragging or insufficient shoe application.
• Brake warning light illumination: Dashboard brake warning activates, often accompanied by abnormal brake behavior — inspect the wheel cylinder immediately.

Confirmed Fitment Sources: Dorman (W610183) lists fitment for Chevrolet 2017–2016 and 2010–2003; GMC 2010–2003; Isuzu 2016–2003. TruckID confirms Isuzu N-Series 2003–2016, Reach 2013–2015, Chevrolet Low Cab Forward 2016–2017, and W-Series 2003–2010. Raybestos confirms Isuzu N-Series 2004–2009 and 2016–2018; Chevrolet Low Cab Forward 2016–2018; W-Series 2003–2009. The 4HK1 engine family is used in Isuzu, GMC and Chevrolet class 3–5 cab-over trucks from 01/2004–02/2007 and later production.

• Position Critical: This is the rear left forward wheel cylinder. N-Series rear brake configurations may use two cylinders per side (forward and rearward). Do not interchange forward and rearward positions — confirm the required position against the original unit.
• Bleeder Configuration: Standard aftermarket configuration (Dorman, Raybestos) is without bleeder screw. Some aftermarket variants (e.g., certain BGF listings) are described as "with bleeder". Confirm your requirement at inquiry.
• Engine Variant: While optimized for 4HK1-T, this wheel cylinder also fits other ISUZU N-Series engine configurations (e.g., 4HE1, 4JJ1, 6.0L GAS) sharing the same rear brake architecture. Always verify against the engine tag and chassis number.
• Replace in Axle Pairs: Industry best practice recommends replacing both left and right wheel cylinders simultaneously to ensure balanced braking performance.
• MC112230 vs. MC894283: Not applicable here — this is an ISUZU part. The paired counterpart for the opposite side should be confirmed via the Blue Print ADZ94416 reference or OEM cross-reference.

Each unit undergoes 100% pressure testing before packaging. Manufacturing conforms to OEM specification standards for hydraulic brake components.

1. Safety first: Park on level ground, engage the parking brake, and chock the front wheels. Wear safety glasses and gloves.
2. Remove wheel and drum: Loosen lug nuts, raise the vehicle, remove the wheel, and extract the brake drum. Inspect drum and shoes for wear.
3. Disconnect hydraulic line: Place a drain pan underneath, disconnect the brake line from the wheel cylinder, and plug the line to prevent contamination.
4. Remove old cylinder: Unbolt the wheel cylinder from the backing plate. Note the orientation of the push rods, spring positions, and forward/rearward position.
5. Clean mounting surface: Remove rust, dirt and debris from the backing plate mounting area. Inspect the backing plate for damage.
6. Install new cylinder: Position the new wheel cylinder (8-97349707-0) onto the backing plate. Tighten mounting bolts to 14–18 N·m (10–13 lb·ft) — reference value from ISUZU workshop data; always confirm against the specific model manual.
7. Reconnect brake line: Connect the hydraulic line to the inlet port. Tighten to M10 × 1.0 thread specification without over-torquing.
8. Install shoes and drum: Reinstall brake shoes, adjuster components and drum. Set shoe-to-drum clearance per the workshop manual.
9. Bleed the brake system: Fill the master cylinder reservoir with DOT 3 or DOT 4 brake fluid. Bleed until clear, bubble-free fluid flows from the bleeder screw. Note: Standard configuration is supplied without a bleeder screw — confirm your bleeding method or verify whether a bleeder-equipped variant is required.
10. Test brakes: Pump the pedal to seat the shoes, check for leaks, and road-test at low speed before returning the vehicle to service.

• Inspect wheel cylinders every 40,000–50,000 km or during any brake service.
• Replace wheel cylinders in axle pairs — replacing only one side can cause uneven braking and pull to one side.
• Flush brake fluid every 2 years or according to the manufacturer interval — contaminated fluid accelerates seal degradation.
• Inspect the backing plate for brake fluid wetness at every oil change — early detection prevents catastrophic seal failure.

• Standard packing: Individual box with protective packaging; wooden pallet available for bulk orders.
• Package contents: 1 × Rear Left Forward Brake Wheel Cylinder (installation hardware not included; bleeder screw not included in standard configuration).
• Set options: Left forward only, or left forward + right pair — specify at inquiry.
• Suitable for: Brake system repair shops, fleet maintenance departments, spare parts distributors and export wholesalers.
• Related parts available: Rear left rearward wheel cylinder, rear right wheel cylinder (ADZ94416 counterpart), brake shoes, brake drums, wheel cylinder repair kits, brake fluid (DOT 3/DOT 4) and brake hardware kits.