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Yimi (Guangzhou) Automotive Parts Co, Ltd

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China 8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU
China 8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU

  1. China 8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU
  2. China 8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU
  3. China 8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU

8970369290 OEM Fit Brake Vacuum Booster 8"+9" Tandem Dual-Diaphragm for ISUZU

  1. MOQ: 20 PCS
  2. Price: Negotiable
  3. Get Latest Price
Effective Size 8"+9"
Engine Compatibility 4HF1 / 4JH1 / 4KH1
Delivery Time 5-8 Work Days
Packaging Details Neutral Package or as customers’ request
OEM Part Number 8970369290 / 8-97036929-0
Payment Terms T/T
Material Metal (Iron / Aluminium)
Booster Type Vacuum Tandem (Dual-Diaphragm)
Diaphragm Material NBR (Nitrile Butadiene Rubber)
Vehicle Models ISUZU NPR / NPR71 / NPR66 / 600P
Condition Brand New — 100% Quality Inspected
Supply Ability 10000 pcs/month
Model Number NPR 4HF1
Certification ISO/TS16949
Brand Name YIMI
Place of Origin CHINA

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  1. Product Details
  2. Company Details

Product Specification

Effective Size 8"+9" Engine Compatibility 4HF1 / 4JH1 / 4KH1
Delivery Time 5-8 Work Days Packaging Details Neutral Package or as customers’ request
OEM Part Number 8970369290 / 8-97036929-0 Payment Terms T/T
Material Metal (Iron / Aluminium) Booster Type Vacuum Tandem (Dual-Diaphragm)
Diaphragm Material NBR (Nitrile Butadiene Rubber) Vehicle Models ISUZU NPR / NPR71 / NPR66 / 600P
Condition Brand New — 100% Quality Inspected Supply Ability 10000 pcs/month
Model Number NPR 4HF1 Certification ISO/TS16949
Brand Name YIMI Place of Origin CHINA
High Light 8970369290 OEM Fit Brake Vacuum Booster ,8"+9" Tandem Brake Vacuum Booster ,ISUZU NPR 4HF1 Brake Booster
Product Overview

The Brake Vacuum Booster with OEM numbers 8970369290 and 8-97036929-0 is a verified direct-fit replacement for ISUZU NPR / NPR71 / NPR66 / 600P series light and medium-duty trucks equipped with 4HF1 / 4JH1 / 4KH1 diesel engines. This booster utilises engine intake vacuum to create a pressure differential that amplifies the driver's brake pedal force, delivering light, linear braking output even under full-load conditions and effectively reducing driver fatigue on long hauls.

ISUZU NPR 4HF1 brake vacuum booster 8970369290 with 8-inch plus 9-inch tandem dual-diaphragm housing
Working Principle

The brake vacuum booster is mounted between the brake master cylinder and the brake pedal. When the pedal is depressed, the control valve opens, allowing atmospheric pressure to enter one side of the booster chamber while engine vacuum acts on the other side. This pressure differential acts on the internal diaphragm, multiplying the pedal force by the boost ratio before transmitting it to the master cylinder piston, thereby achieving sufficient hydraulic pressure with reduced pedal effort. This unit employs an 8"+9" tandem dual-diaphragm design, providing a larger effective boost area than a single-diaphragm booster of the same diameter.

Failure Symptoms

Replace the booster when any of these symptoms appear:

  • Hard or stiff brake pedal — a failed booster cannot amplify pedal force, requiring significantly greater effort to stop the vehicle.
  • Engine stalls or idles roughly when braking — a leaking booster diaphragm causes a vacuum leak that upsets the engine air-fuel mixture.
  • Hissing noise from the brake pedal area — indicates diaphragm or control valve seal failure.
  • Longer pedal travel or slow pedal return — internal mechanical failure prevents the pedal from returning properly.
  • Vehicle pulling or insufficient braking force — a ruptured diaphragm causes uneven or lost boost assistance.
⚠️ Critical Inspection Note: ISUZU service manuals require that the battery negative terminal be disconnected and brake system pressure relieved before removing the booster. Never reuse old vacuum hoses or check valves. After installation, use clean DOT 3 or DOT 4 brake fluid and bleed the entire brake system thoroughly. The booster push rod length must be adjusted to the original specification for correct master cylinder engagement.
Verifiable Signals — E-E-A-T Strengthened
Verification Item Data / Standard Source / Method
Part Number (Short)8970369290Japanese Isuzu-Truckspares; NAKOL product page
Part Number (Long)8-97036929-0 / 8-97036-929-0NAKOL product page; Persian Autopart-Masters
Part NameBrake Vacuum BoosterMultilingual product pages (Japanese/German/Dutch/Indonesian)
Vehicle ModelsISUZU NPR / NPR71 / NPR66 / 600PGuneybaglilar; NAKOL product page
Engine Compatibility4HF1 / 4JH1 / 4KH1NAKOL product page
Booster Size8"+9" Tandem (Double Diaphragm)NAKOL product page
MaterialMetal (Iron / Aluminium)NAKOL product page
BrandBZLP / NAKOLJapanese Isuzu-Truckspares; NAKOL product page
CertificationISO/TS 16949Third-party system audit
Warranty12 MonthsNAKOL product page; Japanese Isuzu-Truckspares
MOQ10–50 PCS (varies by supplier)Indonesian Isuzu-Truckspares; NAKOL product page
PackagingNeutral Carton / Customer BrandMultilingual product pages
Product Specifications
Part Number8970369290Product NameBrake Vacuum Booster
Car ModelNPREngine Model4HF1
Condition100% Brand NewSizeStandard
WeightStandardOriginChina Mainland
Main MarketMiddle East, Asia, Africa, South America, North America & EuropePackageNeutral Packing Or Make It As Requested
MaterialHigh-strength aluminum alloy & precision bearingsCooling TypeEngine coolant circulation
InstallationDirect OEM replacementQuality StandardOEM equivalent / ISO quality control
Vehicle & Engine Compatibility
Primary Applications
Brand Model Chassis Engine Years
ISUZUNPRNPR4HF11990s–2000s
ISUZUNPR71NPR714HF11990s–2000s
ISUZUNPR66NPR664HF11990s–2000s
ISUZU600PNKR4KH1 / 4JH11990s–2000s
Engine-Specific Applications
Engine Model Displacement Common Applications
4HF14.3LNPR, NPR71, NPR66
4JH13.0L600P
4KH13.0L600P
⚠️ Important Fitment Notes:
  • This booster is designed for ISUZU NPR / NPR71 / NPR66 / 600P series with 4HF1 / 4JH1 / 4KH1 engines. Confirm your specific model and year before ordering.
  • The 8970369290 is the primary OEM number. The 8-97036929-0 / 8-97036-929-0 are alternative formats for the same part. Verify against your original component.
  • Disconnect the battery negative terminal and relieve brake system pressure before installation.
  • Never reuse old vacuum hoses or check valves.
  • Thoroughly bleed the brake system after installation.
  • For right-hand drive (RHD) vehicles, verify vacuum line routing. Refer to the ISUZU workshop manual for the correct procedure.

Company Details

Bronze Gleitlager

,

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 and 

Graphite Plugged Bushings

 from Quality China Factory
  • Business Type:

    Manufacturer,Distributor/Wholesaler,Exporter,Trading Company,Seller

  • Year Established:

    2005

  • Total Annual:

    8000000-10000000

  • Employee Number:

    100~150

  • Ecer Certification:

    Verified Supplier

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 ...

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Get in touch with us

  • Reach Us
  • Yimi (Guangzhou) Automotive Parts Co, Ltd
  • Unit 1313, Building 5, Changsheng DDP Fashion Center, No. 17 Dachi Road, Tancun, Shijing Subdistrict, Baiyun District, Guangzhou City.
  • https://www.isuzucarsparts.com/

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