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Brake System Appliion: Vacuum-assisted hydraulic brake systems compatible with standard ISUZU NHR brake configurations.
Installation Notes
Professional installation required. Brake system safety is critical.
Disconnect battery – Disconnect the negative battery cable before beginning work.
Depressurize the brake system – Pump the brake pedal several times to release vacuum pressure.
Drain brake fluid – Drain the brake fluid from the master cylinder reservoir.
Disconnect brake lines – Carefully disconnect the brake lines from the master cylinder.
Disconnect vacuum hose – Disconnect the vacuum supply hose from the booster.
Remove the old assembly – Unbolt and remove the brake master vac assembly from the firewall.
Inspect the brake pedal linkage – Check the push rod and pedal linkage for wear or damage.
Inspect vacuum hose – Check the vacuum supply hose for cracks or damage; replace if necessary.
Check the check valve – Verify the one-way check valve functions properly.
Clean mounting area – Clean the firewall mounting surface and surrounding area.
Prepare the new assembly – Inspect the new assembly and verify it matches the original.
Adjust push rod length – Adjust the push rod length to match the original assembly (if adjustable).
Install the new assembly – Position the new assembly on the firewall and secure with mounting bolts.
Torque to specifiion – Tighten mounting nuts to manufacturer specifiion.
Reconnect vacuum hose – Reconnect the vacuum supply hose to the booster.
Reconnect brake lines – Reconnect the brake lines to the master cylinder.
Reconnect battery – Reconnect the negative battery cable.
Fill with brake fluid – Fill the master cylinder reservoir with the recommended brake fluid.
Bleed the brake system – Bleed the entire brake system to remove all air.
Test operation – Start the engine and test brake pedal feel and booster operation.
Check for leaks – Inspect all connections for vacuum or brake fluid leaks.
Road test – Test drive the vehicle to verify proper braking performance.
Quality Control
Material Verifiion: Confirms housing, diaphragm, and seal materials meet OE specifiions.
Dimensional Inspection: Mounting points, push rod length, and master cylinder bore verified against OEM tolerances.
Vacuum Integrity Testing: 100% tested for vacuum retention and leak-free operation.
Hydraulic Pressure Testing: Master cylinder pressure and seal integrity verified.
Diaphragm Integrity Testing: Diaphragm flexibility and durability verified.
Performance Testing: Boost ratio and hydraulic output verified under simulated operating conditions.
Corrosion Testing: Housing treated for corrosion resistance in demanding environments.
Visual Inspection: 100% checked for defects, machining flaws, or damage.
Packaged Safely: Protected and securely packaged to prevent damage and contamination during transit.
Packaging and Delivery
• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea
Inquiry
For pricing, availability, or bulk purchase of the Brake Master Vac Assembly 8-94135387-0 For ISUZU 4JA1 4JB1 NHR Truck 8941353870, please contact our sales team for a competitive quote and expert technical support.
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 ...
