ISUZU Front Brake Wheel Cylinder 8-97139820-0 8971398200 for NKR NPR 4HF1 — 1-3/16 Inch Front Right OEM Standard

Opening:
The ISUZU Front Brake Wheel Cylinder with OEM numbers 8-97139820-0 / 8971398200 is a precision-engineered replacement designed for ISUZU NKR and NPR series light-duty trucks, compatible with 4HF1 diesel engines. This component is a core actuation element of the vehicle's hydraulic braking system — the Front Right Brake Wheel Cylinder Assembly — responsible for converting hydraulic pressure from the master cylinder into mechanical force to push the brake shoes against the brake drum.

📌 Numbering Note: This product number is 8-97139820-0 / 8971398200. Same-series numbers include 8-97022028-1 / 8970220281 and 8-97022028-0 / 8970220280. Cross-reference numbers include IZUMI, CENTRIC 134.76008, and NAGAMOCHI WC24073F. Please verify the specific number and installation position based on actual vehicle configuration.

Working Principle:
The brake wheel cylinder is a critical actuation component of the hydraulic braking system, mounted on the brake backing plate and connected to the master cylinder via brake fluid lines. Its working principle includes:

1. Hydraulic Input: When the driver depresses the brake pedal, the master cylinder converts pedal force into hydraulic pressure transmitted through the brake fluid lines.

2. Piston Actuation: Hydraulic pressure pushes the piston inside the wheel cylinder outward.

3. Brake Shoe Expansion: The piston transmits force through the push rod to the brake shoes, expanding them against the rotating brake drum to generate friction for deceleration.

4. Brake Release: When the driver releases the brake pedal, hydraulic pressure is released and return springs pull the piston back, separating the brake shoes from the drum.

Failure Symptoms (⚠️ Inspect immediately if any of these occur):

Verifiable Data (🔬 Based on Industry Standards & General Validation):

• ✅ Bore Size: 1-3/16 Inch (30.16mm)— industry-verified standard specification for NKR/NPR/4HF1 models.

• ✅ Gear Teeth: 16 teeth— for brake shoe clearance adjustment.

• ✅ Installation Position: Front Right (RH)— designed for precise fitment on the front right wheel.

• ✅ Material Standard: Manufactured from Heavy-Duty Cast Iron— durable, capable of withstanding high pressure and thermal cycling for heavy-duty truck applications.

• ✅ Brake Type: Drum Brake.

• ✅ Premium Seals: High-quality seals prevent leaks and contamination.

• ✅ Complete Maintenance Design: Equipped with bleeder screw and gear-style adjuster— facilitates brake system bleeding and shoe clearance adjustment.

• ✅ OE Cross-Reference Verified: Replaces OEM numbers 8-97139820-0 / 8971398200; compatible with 8-97022028-0 / 8970220280, 8-97022028-1 / 8970220281, and 8-97022-028-0.

• ✅ Brand Certification: Supplied by IZUMI, DAMIN and other brands, ISO/TS16949 certified.

• ✅ Place of Origin: China.

• ✅ Net Weight: 1.0～1.15 kg.

• ✅ HS Code: 870830000

📌 Left/Right Side Pairing: This product is the Front Right (RH) brake wheel cylinder. The Front Left (LH) counterpart is 8971398190 / 8-97139819-0. Please confirm whether the left or right side is needed before ordering.

1. Number Confirmation: This product number is 8-97139820-0 / 8971398200. Same-series numbers include 8-97022028-0 / 8970220280 and 8-97022028-1 / 8970220281. Verify the specific number on the original part before ordering.

2. Installation Position: This is the Front Right (RH) brake wheel cylinder. Confirm whether the left or right side is needed.

3. Pair Replacement Recommended: Brake wheel cylinders should be replaced in pairs (left and right) to ensure balanced braking force.

4. Associated Components: When replacing the wheel cylinder, it is recommended to inspect brake shoes, brake drums, and brake lines — replace if necessary.

5. Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed the hydraulic system when replacing the wheel cylinder.

6. Professional Installation: The brake wheel cylinder is a critical braking system safety component — professional installation is strongly recommended.

The brake wheel cylinder is a critical braking system safety component that directly affects vehicle braking performance and driving safety. Professional installation with specialized tools is strongly recommended.

Preparation:

• Confirm installation position (Front Right) and part number (8-97139820-0)

• Prepare tools: Socket wrench, brake line wrench, torque wrench, brake fluid (DOT 3 or DOT 4)

• Recommended to also prepare: Brake shoes, brake drum, brake fluid

Removing Old Wheel Cylinder:

1. Park vehicle on level surface, engage parking brake, and securely support with jack stands.

2. Remove the relevant wheel to access the brake assembly.

3. Disconnect the brake fluid line from the old cylinder using a brake line wrench.

4. Remove bolts or fasteners securing the old cylinder.

5. Carefully remove the old brake wheel cylinder.

Installing New Wheel Cylinder (Installation Sequence):

1. Clean mounting surface: Thoroughly clean the brake backing plate mounting surface — ensure no oil, dirt, or debris.

2. Install new cylinder: Position the new cylinder correctly and torque mounting bolts to specification.

3. Connect brake line: Reconnect the brake fluid line — ensure tight, leak-free connection.

4. Fill brake fluid: Fill the master cylinder reservoir with DOT 3 or DOT 4 brake fluid to the correct level.

5. Brake system bleeding: Mandatory — bleed the brake system using the bleeder screw starting from the farthest wheel to remove air from lines until the brake pedal feels firm.

6. Leak check: Inspect all connections and cylinder body — confirm no brake fluid leakage.

Post-Installation Checks (Mandatory):

1. Brake pedal feel check: Depress brake pedal — confirm firm feel, no sponginess, normal travel.

2. Leak check: Inspect all brake line connections and cylinder body — confirm no brake fluid leakage.

3. Road test: Perform low-speed brake test — confirm balanced braking, no pulling, no abnormal noise, normal stopping distance.