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Rear Right Brake Wheel Cylinder 8-97139814-0 8971398140 8-97022029-0 8970220290 For ISUZU ELF NKR NPR NHR NPR59 4BD1 4HF1 — OEM 1-3/16″ (30mm) Drum Brake Cylinder With Bleeder Screw
Product Overview
The Rear Brake Wheel Cylinder with OEM numbers 8-97139814-0 (also listed as 8971398140, 8-97022029-0, 8970220290) is a verified OEM-grade direct replacement for a wide range of ISUZU light and medium-duty trucks, including the ELF, NKR, NPR, NHR, and NPR59 series. Manufactured to ISUZU's stringent OEM specifications, this wheel cylinder is a critical component of the rear drum brake system.
Important Cross-Reference Note: Part numbers 8-97139814-0, 8971398140, 8-97022029-0, and 8970220290 are interchangeable for these applications. The Left-Hand (LH) counterpart is 8-97139821-0 / 8971398210 / 8-97022028-1. Please verify your vehicle's specific requirements before ordering.
OEM Specification — Verified by ISUZU OEM part numbers 8-97139814-0, 8971398140, 8-97022029-0, and 8970220290
Precision 1-3/16″ (30mm) Bore — Verified by ASHIKA 65-09-905, JAPKO 65905, and KAVO PARTS BWC-9055 specifications
Heavy-Duty Cast Iron Construction — Provides exceptional durability and heat dissipation under demanding commercial conditions
Complete with Bleeder Screw & Gear Adjuster — Supplied with bleeder pin and gear adjuster for easy brake system bleeding and shoe clearance adjustment
Verified OEM Fitment — Confirmed for ISUZU ELF, NKR, NPR, NHR, NPR59 models with 4BD1, 4HF1, 4JB1, 4JG2 engines from 1992-2003
ISO/TS16949 Certified — Manufactured under strict quality control standards
OEM Cross-Reference Verified — Interchangeable with TRW BWN411, ASHIKA 65-09-905, and JAPKO 65905
Part Number
8-97139814-0 8971398140 8-97022029-0 8970220290
Product Name
Rear Right Brake Wheel Cylinder
Car Model
ISUZU ELF NKR NPR NHR NPR59
Engine Model
ISUZU 4BD1 4HF1
Condition
100% Brand New
Failure Symptoms
If your rear brake wheel cylinder is failing, you may experience one or more of the following symptoms:
Brake Fluid Leakage: Visible fluid seeping from the rear wheels or inside the brake drum — indicates worn seals
Soft or Spongy Brake Pedal: Pedal feels unusually soft or goes to the floor — indicates internal seal failure
Reduced Braking Performance: Vehicle takes longer to stop or requires increased pedal pressure
Uneven Braking: Vehicle pulls to one side during braking — indicates a seized or leaking cylinder on one side
Contaminated Brake Shoes: Brake fluid soaking into the brake shoes, causing reduced friction and brake fade
Low Brake Fluid Level: Unexplained drop in brake fluid reservoir level with no visible external leaks
Warning: A failing brake wheel cylinder can lead to reduced braking performance and potential brake failure — prompt replacement is essential. For optimal performance, it is strongly recommended to replace brake wheel cylinders in pairs (both rear wheels).
Vehicle & Engine Compatibility
CRITICAL: This wheel cylinder is the Rear Right-Hand (RH) unit. The Left-Hand (LH) counterpart is 8-97139821-0 / 8971398210 / 8-97022028-1.
Primary Applications
Brand
Model
Chassis / Series
Engine
Years
ISUZU
ELF
NKR7_, NKS7_, NHR6_, NKR6_, NPR_6
4.3 TD, 4.3 DiTD
1992-2003
ISUZU
NPR59
N-Series
4BD1
--
ISUZU
NKR
N-Series
4JB1, 4JG2
--
ISUZU
NPR
N-Series
4BD1, 4HF1
--
ISUZU
NHR
N-Series
4JB1, 4JG2
--
Cross-Reference Part Numbers
Part Number
Description
Position
8-97139814-0 / 8971398140
Rear Brake Wheel Cylinder
Right Hand (RH) — This Part
8-97139821-0 / 8971398210
Rear Brake Wheel Cylinder
Left Hand (LH) — Counterpart
8-97022029-0 / 8970220290
Rear Brake Wheel Cylinder
RH (earlier variant)
Features & Benefits
OEM Specification — ISUZU Genuine Equivalent
Guarantees factory-fit quality and performance — verified by ISUZU OEM part numbers
Precision 1-3/16″ (30mm) Bore
Delivers consistent hydraulic pressure for reliable braking performance
Heavy-Duty Cast Iron Construction
Provides exceptional durability and heat dissipation under demanding commercial conditions
Complete with Bleeder Screw & Gear Adjuster
Facilitates easy brake system bleeding and shoe clearance adjustment during installation
ISO/TS16949 Certified
Manufactured under strict quality control standards — verified by third-party certification
Direct Bolt-On Fitment
No modifications required — engineered as a direct match for the original cylinder
100% New — No Core Charge
Guarantees zero wear, immediate braking performance, and full service life
Quality Control & Verification
QC Item
Verification Method
Dimensional Accuracy
Precision inspection to verify 1-3/16″ (30mm) bore diameter, M10×1.0 inlet threads, and mounting hole spacing match OE blueprint specifications
Material Composition
Heavy-duty cast iron analysis to verify structural integrity and heat dissipation characteristics
Bore Surface Test
100% surface testing to ensure optimum sealing surface for pressure cups
Leakage Test
100% hydraulic pressure test to guarantee zero fluid leakage under operating conditions
Rubber Component Test
EPDM material verification for heat and corrosion resistance
Durability Cycle Test
500+ hour fatigue testing to verify 200,000+ km service life
Final Assembly Inspection
100% visual and functional inspection before packaging
Installation & Maintenance Recommendations
IMPORTANT: Professional Installation Recommended
Replacing brake wheel cylinders is a critical safety procedure. It is strongly recommended to replace them in pairs (both rear wheels) for balanced braking performance.
Pre-Installation Checklist
CRITICAL: This is the Rear Right-Hand (RH) cylinder — the LH counterpart is 8-97139821-0 / 8971398210
Quantity Required: 2 per vehicle (one for each rear wheel)
Inspect brake shoes, drums, and hardware for wear — replace as necessary
Use new brake fluid (DOT 3 or DOT 4) from a sealed container
Critical: Replace wheel cylinders in pairs (both rear wheels) for balanced braking performance
Installation Guidelines
Safely raise the vehicle and support it on jack stands
Remove the rear wheels and brake drums
Disconnect the brake line from the old wheel cylinder
Remove the mounting bolts securing the cylinder to the backing plate
Remove the old cylinder and clean the backing plate thoroughly
CRITICAL: Install the new cylinder with NEW mounting bolts
Torque the mounting bolts to manufacturer's specified torque settings (refer to ISUZU workshop manual)
Reconnect the brake line and torque to specification (M10×1.0)
CRITICAL: Bleed the brake system thoroughly to remove all air (start with the wheel furthest from the master cylinder)
Refill with fresh DOT 3 or DOT 4 brake fluid
Reinstall the brake drums and wheels
Test brake pedal feel and braking performance before road test
Maintenance Schedule
Inspection: Every 50,000 km / 12 months. Check for fluid leaks, brake pedal feel, and braking performance
Fluid Replacement: Every 2 years or 40,000 km — replace brake fluid to prevent internal corrosion
Replacement: Immediately if failure symptoms appear. Replace in pairs for balanced braking
Packaging & Supply
Packaging: Each brake wheel cylinder is securely packed in a neutral box, color box, or customer brand package
Pack Quantity: 1 PC
Weight: Approx. 1.089 - 1.15 kg
Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
