OEM 2100320390 Rear Brake Drum for JAC N56 Truck — 5-Hole D320mm Direct Fit Brake Drum Replacement
| Outer Diameter: | 320 Mm | Inner Diameter: | 156 Mm |
| Overall Height: | 145 Mm | Overall Width: | 94 Mm |
| Bolt Holes: | 5 | Bolt Hole Diameter: | Ø21 Mm |
| OEM Part Number: | 2100320390 | Condition: | Brand New |
| High Light: | 5-Hole Brake Drum,D320mm Brake Drum,OEM 2100320390 Brake Drum |
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OEM Rear Brake Drum 2100320390 for JAC N56 Light Truck — Direct-Fit Replacement, 5-Hole, D320mm
The Rear Brake Drum with OEM number 2100320390 is a direct-fit replacement brake drum for JAC N56 light trucks. This drum works together with the brake shoes to slow and stop the vehicle through internal expansion friction.
Working Principle: The brake drum rotates with the wheel hub. When the driver applies the brakes, hydraulic pressure pushes the brake shoes outward against the inner surface of the drum. The friction between the shoes and drum converts kinetic energy into heat, slowing the vehicle. The drum must maintain roundness, balanced rotation, and minimum thickness to ensure safe, vibration-free braking. A worn or out-of-round drum causes pedal pulsation, noise, and reduced braking efficiency.
- ✓OEM Number: 2100320390 — confirmed across multiple independent suppliers and JAC official dealer.
- ✓Part Name: Rear Brake Drum / Барабан тормозной задний / ดรัมเบรคหลัง / tambour de frein arrière — confirmed in English, Russian, Thai, French, and Japanese listings.
- ✓Vehicle Compatibility: JAC N56 — confirmed by JAC official dealer in Blagoveshchensk.
- ✓Dimensions (Reference): 5 holes × Ø21 × H=145 / D=320 × 156 × T94 — per one supplier listing.
- ✓Country of Origin: China — per supplier listing.
- ✓Warranty: 3 months (IZUMI listing).
- ✓Delivery: 15–20 days after payment (IZUMI listing).
Pending Verification: Weight — one supplier lists 0.145 kg, which is implausibly low for a brake drum; do not use this figure without verification. Material grade, minimum thickness, and balance spec are not specified in available sources. Bench test data (hardness, thermal crack resistance, dynamic balance) is pending — supplying your own test report is recommended.
- Brake pedal pulsation or vibration during braking
- Squealing, grinding, or scraping noise when braking
- Visible deep grooves, scoring, or heat cracks on drum surface
- Longer stopping distance or reduced braking efficiency
- Vehicle pulls to one side during braking
| Part Number | 2100320390 |
|---|---|
| Product Name | Rear Brake Drum |
| Car Model | JAC N56 |
| Engine Model | JAC N56 |
| Condition | 100% Brand New |
| Weight | Standard |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing or Made as Requested |
| Warranty | 6 Months |
| Price & Stock | Please Contact Us to Get More Information |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Feature | Benefit & Verification Signal |
|---|---|
| OEM-matched fitment for JAC N56 | Direct replacement for worn or out-of-round original drum — OEM number confirmed by JAC official dealer. |
| 5-hole, D320mm configuration (per one source) | Correct fitment for N56 rear axle — dimensions per supplier listing. |
| IZUMI aftermarket option | Established aftermarket brand with 3-month warranty — per supplier listing. |
| Chinese manufacturing | Consistent with JAC original supply chain — country of origin confirmed. |
| QC Item | Verification Method |
|---|---|
| Drum diameter | Micrometer / caliper measurement (spec: D320 outer / 156 inner per reference) |
| Roundness | Dial indicator on inner surface (spec pending) |
| Surface hardness | Hardness test (spec pending) |
| Crack detection | Visual + dye penetrant inspection (spec pending) |
| Dynamic balance | Brake drum balancer (spec pending) |
IMPORTANT: Brake system work is safety-critical. Replace drums in axle pairs (both left and right). Use new brake shoes when installing new drums. Clean the hub surface before installation. Professional workshop installation is strongly recommended.
- Raise the vehicle and secure it on stands. Remove the wheel.
- Remove the brake drum retaining screws/clips. Slide the drum off the hub. If seized, use a brake drum puller.
- Clean the hub surface and inspect the brake shoes for wear.
- Install the new drum. Secure the retaining screws.
- Adjust brake shoe clearance per OEM spec (spec pending — verify against JAC manual).
- Reinstall the wheel. Pump the brake pedal to seat the shoes before driving.
- Test the brakes at low speed first.
Inspect brake drums at every tire rotation or every 10,000 km. Measure the inner diameter and check for cracks, deep grooves, or heat spots. Replace drums when worn beyond maximum diameter or when symptoms (pulsation, noise, reduced braking) appear. Replace brake shoes as a set when worn.
- Neutral box / color box / custom brand packaging
- Suitable for: wholesale distributors, brake repair workshops, JAC parts suppliers
- MOQ: small orders accepted
- Delivery: 15–20 days after payment
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