Yimi (Guangzhou) Automotive Parts Co, Ltd
| Payment Terms | T/T, |
| Hub Bore | 202 mm |
| Thickness | 30 mm |
| Delivery Time | 5-8 Work Days |
| Bearing/Seal Bore | 95.3 mm |
| Overall Height | 128.7 – 129 mm |
| Certifiion | ISO/TS16949 |
| Inner Diameter | 320 mm |
| Supply Ability | 10000 pcs/month |
| Bolt Circle Diameter | 160 mm |
| Outer Diameter | 373.9 – 375 mm |
| Packaging Details | Neutral Package or as customers’ request |
| Max Operating Temperature | 800°C |
| Model Number | Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L |
| Brand Name | YIMI |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T, | Hub Bore | 202 mm |
| Thickness | 30 mm | Delivery Time | 5-8 Work Days |
| Bearing/Seal Bore | 95.3 mm | Overall Height | 128.7 – 129 mm |
| Certifiion | ISO/TS16949 | Inner Diameter | 320 mm |
| Supply Ability | 10000 pcs/month | Bolt Circle Diameter | 160 mm |
| Outer Diameter | 373.9 – 375 mm | Packaging Details | Neutral Package or as customers’ request |
| Max Operating Temperature | 800°C | Model Number | Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L |
| Brand Name | YIMI | Place of Origin | China |
| High Light | Rear Brake Drum for Toyota Coaster ，HT250 Grey Cast Iron Brake Drum ，OEM Specifiion 320mm Brake Drum | ||
The rear brake drum with Toyota OEM number 42431-37080 is a direct factory-spec replacement for the rear braking system on a wide range of Toyota commercial vehicles. This drum serves as the friction surface where brake shoes press outward to slow and stop the vehicle, converting kinetic energy into heat through friction.
As a critical safety component, the drum's inner surface wears over time, becoming scored or exceeding maximum allowable diameter, which reduces braking effectiveness. Common symptoms requiring replacement include pulsating brake pedal, reduced braking performance, squealing or grinding noises, or visible scoring on the friction surface.
| Part Number: | 42431-37080 | Product Name: | Rear Brake Drum |
| Car Model: | Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L | Engine Model: | Toyota 1HZ (4.2D) 2TR-FE (2.7L) 14B |
| Condition: | 100% Brand New | Size: | Standard |
| Material: | HT250 Grey Cast Iron | Inner Diameter: | 320 mm |
| Outer Diameter: | 373.9 - 375 mm | Overall Height: | 128.7 - 129 mm |
| Weight: | 14 kg | Origin: | China Mainland |
This Toyota rear brake drum directly replaces the factory component in the following configurations:
Provides excellent thermal conductivity for quick heat dissipation and reduced brake fade. Natural graphite lubriion reduces brake squeal and extends lining life.
320 mm inner diameter ensures consistent contact with brake shoes for smooth, predictable braking performance.
Prevents vibration during high-speed operation, eliminating pedal pulsation and premature wear on suspension components.
Protective coating on non-friction surfaces resists moisture, road salt, and brake dust, extending service life.
Exact Toyota part number 42431-37080 ensures direct bolt-on replacement with no modifiions required.
| QC Item | Verifiion Method |
|---|---|
| Material composition | Spectrographic analysis - HT250 grey cast iron grade confirmed |
| Inner diameter | Precision measurement - 320 mm ±0.5 mm |
| Outer diameter | Precision measurement - 373.9 - 375 mm |
| Overall height | Precision measurement - 128.7 - 129 mm |
| Run-out | Dial gauge measurement - within OE tolerance |
| Dynamic balance | Spin-balanced at operating speed |
| Hardness | Brinell hardness test - confirmed to HT250 specifiion |
| Visual inspection | 100% - no casting defects, porosity, or cracks |
Certifie of conformance (COC) with batch test data available for wholesale orders.
| Symptom | Diagnosis |
|---|---|
| Pulsating brake pedal during braking | Warped or out-of-round drum - immediate inspection required |
| Reduced braking performance or increased stopping distance | Worn friction surface or drum exceeding maximum diameter |
| Squealing or grinding noise from rear wheels | Worn brake shoes scoring the drum surface |
| Visible scoring, grooves, or cracks | Drum damage - replace immediately |
| Vehicle fails brake inspection | Drum diameter exceeds maximum allowable specifiion |
Sealed in anti-rust VCI bag, foam-lined carton
Approximately 38 × 38 × 15 cm
14 kg
20 units per export carton (palletisable)
3-7 days (stock); 15-25 days (production)
1 piece (sample available)
FedEx/UPS/DHL (samples); Sea freight (bulk)
8708.30
The Toyota rear brake drum 42431-37080 is an OEM-spec replacement for the rear axle of Toyota Coaster and Dyna vehicles. Cast from HT250 grey cast iron with 320 mm inner diameter and weighing 14 kg, it restores factory braking performance and safety.
Company Details
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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