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Rear Brake Drum 42431-37080 HT250 Grey Cast Iron 320 mm Inner Diameter OEM Specification for Toyota Coaster Dyna
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Rear Brake Drum 42431-37080 HT250 Grey Cast Iron 320 mm Inner Diameter OEM Specification for Toyota Coaster Dyna
  • name
  • name

Rear Brake Drum 42431-37080 HT250 Grey Cast Iron 320 mm Inner Diameter OEM Specification for Toyota Coaster Dyna

MOQ: 10 pcs
Price: Negotiable
Standard Packaging: Neutral Package or as customers’ request
Delivery Period: 5-8 Work Days
Payment Method: T/T,Western Union
Supply Capacity: 10000 pcs/month
Detail Information
Product Description
Detail Information
Place of Origin
China
Brand Name
YIMI
Certification
ISO/TS16949
Model Number
Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L
Outer Diameter:
373.9 – 375 Mm
Thickness:
30 Mm
Inner Diameter:
320 Mm
Max Operating Temperature:
800°C
Bearing/Seal Bore:
95.3 Mm
Overall Height:
128.7 – 129 Mm
Hub Bore:
202 Mm
Bolt Circle Diameter:
160 Mm
Highlight:

Rear Brake Drum for Toyota Coaster

,

HT250 Grey Cast Iron Brake Drum

,

OEM Specification 320mm Brake Drum

Product Description
Rear Brake Drum 42431-37080 For Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L
Product Overview

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.

Toyota Rear Brake Drum 42431-37080
Technical Specifications
Part Number:42431-37080Product Name:Rear Brake Drum
Car Model:Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7LEngine Model:Toyota 1HZ (4.2D) 2TR-FE (2.7L) 14B
Condition:100% Brand NewSize:Standard
Material:HT250 Grey Cast IronInner Diameter:320 mm
Outer Diameter:373.9 - 375 mmOverall Height:128.7 - 129 mm
Weight:14 kgOrigin:China Mainland
Vehicle Applications

This Toyota rear brake drum directly replaces the factory component in the following configurations:

Toyota Coaster (B40/B50 Series)
  • BB42, BB50, BB53 (1990-2007)
  • RZB40, RZB50, RZB53, RZB54
  • HZB50, XZB53, TRB53
  • Engines: 14B, 1HZ, 2TR-FE
Toyota Dyna / ToyoAce
  • XZU301, XZU341, XZU362, XZU372, XZU382 (05.1999-06.2004)
  • XZU368, XZU378, XZU388 (06.2004-05.2007)
  • RZU300, XZU300, XZU31#, XZU321, XZU331, XZU334, XZU346
  • BU30#, BU346
Important fitment note: This drum is used on the rear axle of these vehicles. Always verify your vehicle's chassis code and production date before ordering.
Features & Benefits
HT250 Grey Cast Iron Construction

Provides excellent thermal conductivity for quick heat dissipation and reduced brake fade. Natural graphite lubrication reduces brake squeal and extends lining life.

Precision-Machined Friction Surface

320 mm inner diameter ensures consistent contact with brake shoes for smooth, predictable braking performance.

Dynamically Balanced

Prevents vibration during high-speed operation, eliminating pedal pulsation and premature wear on suspension components.

Corrosion-Resistant Coating

Protective coating on non-friction surfaces resists moisture, road salt, and brake dust, extending service life.

Direct OE Replacement

Exact Toyota part number 42431-37080 ensures direct bolt-on replacement with no modifications required.

Quality Control
QC ItemVerification Method
Material compositionSpectrographic analysis - HT250 grey cast iron grade confirmed
Inner diameterPrecision measurement - 320 mm ±0.5 mm
Outer diameterPrecision measurement - 373.9 - 375 mm
Overall heightPrecision measurement - 128.7 - 129 mm
Run-outDial gauge measurement - within OE tolerance
Dynamic balanceSpin-balanced at operating speed
HardnessBrinell hardness test - confirmed to HT250 specification
Visual inspection100% - no casting defects, porosity, or cracks

Certificate of conformance (COC) with batch test data available for wholesale orders.

Installation & Maintenance
⚠️ IMPORTANT: Brake drum replacement is a safety-critical procedure. Professional installation by a qualified mechanic is strongly recommended. Incorrect installation can lead to brake failure and serious accidents.
Replacement Symptoms
SymptomDiagnosis
Pulsating brake pedal during brakingWarped or out-of-round drum - immediate inspection required
Reduced braking performance or increased stopping distanceWorn friction surface or drum exceeding maximum diameter
Squealing or grinding noise from rear wheelsWorn brake shoes scoring the drum surface
Visible scoring, grooves, or cracksDrum damage - replace immediately
Vehicle fails brake inspectionDrum diameter exceeds maximum allowable specification
Critical Installation Notes
  • Measure the drum inner diameter before installation
  • Clean the hub mounting surface thoroughly
  • Inspect and replace brake shoes if worn
  • Check wheel cylinders for leaks or corrosion
  • Adjust brake shoes to correct clearance
  • Bleed the brake system if hydraulic components were opened
  • Bed in new drums with gentle stops from low speed
  • Retorque wheel nuts after first 100 km of driving
Packaging & Supply
Individual Packaging

Sealed in anti-rust VCI bag, foam-lined carton

Carton Dimensions

Approximately 38 × 38 × 15 cm

Net Weight

14 kg

Master Carton

20 units per export carton (palletisable)

Lead Time

3-7 days (stock); 15-25 days (production)

Minimum Order

1 piece (sample available)

Shipping

FedEx/UPS/DHL (samples); Sea freight (bulk)

H/S Code

8708.30

Quick Summary

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.

Before ordering: Confirm your vehicle's chassis code and production date. The maximum allowable inner diameter is stamped on the drum - if your existing drum exceeds this specification, replacement is required.
Tags: 

Toyota RAV4 headlamp assembly,  

Toyota Starlet cylinder head with warranty,  

Lexus GS350 replacement motor

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Products
PRODUCTS DETAILS
Products

Isuzu Cars Parts

Isuzu Engine Parts

Isuzu Chassis Parts

ISUZU Truck Parts

VW Car Parts

AUDI Car Parts

QINGLING ISUZU Parts

NISSAN Spare Parts

MITSUBISHI Auto Parts

FUSO Truck Parts

TOYOTA Auto Parts

HINO Truck Parts

HONDA Auto Parts

MAZDA Spare Parts

JAC Spare Parts

JMC Spare Parts

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HYUNDAI Auto Parts

KIA Auto Parts

Other Auto Parts
Rear Brake Drum 42431-37080 HT250 Grey Cast Iron 320 mm Inner Diameter OEM Specification for Toyota Coaster Dyna
  • name
  • name
Rear Brake Drum 42431-37080 HT250 Grey Cast Iron 320 mm Inner Diameter OEM Specification for Toyota Coaster Dyna
MOQ: 10 pcs
Price: Negotiable
Standard Packaging: Neutral Package or as customers’ request
Delivery Period: 5-8 Work Days
Payment Method: T/T,Western Union
Supply Capacity: 10000 pcs/month
Detail Information
Product Description
Detail Information
Place of Origin
China
Brand Name
YIMI
Certification
ISO/TS16949
Model Number
Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L
Outer Diameter:
373.9 – 375 Mm
Thickness:
30 Mm
Inner Diameter:
320 Mm
Max Operating Temperature:
800°C
Bearing/Seal Bore:
95.3 Mm
Overall Height:
128.7 – 129 Mm
Hub Bore:
202 Mm
Bolt Circle Diameter:
160 Mm
Minimum Order Quantity:
10 pcs
Price:
Negotiable
Packaging Details:
Neutral Package or as customers’ request
Delivery Time:
5-8 Work Days
Payment Terms:
T/T,Western Union
Supply Ability:
10000 pcs/month
Highlight

Rear Brake Drum for Toyota Coaster

,

HT250 Grey Cast Iron Brake Drum

,

OEM Specification 320mm Brake Drum

Product Description
Rear Brake Drum 42431-37080 For Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7L
Product Overview

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.

Toyota Rear Brake Drum 42431-37080
Technical Specifications
Part Number:42431-37080Product Name:Rear Brake Drum
Car Model:Toyota Coaster BB50 BB42 RZB50 HZB50 4.2D 2.7LEngine Model:Toyota 1HZ (4.2D) 2TR-FE (2.7L) 14B
Condition:100% Brand NewSize:Standard
Material:HT250 Grey Cast IronInner Diameter:320 mm
Outer Diameter:373.9 - 375 mmOverall Height:128.7 - 129 mm
Weight:14 kgOrigin:China Mainland
Vehicle Applications

This Toyota rear brake drum directly replaces the factory component in the following configurations:

Toyota Coaster (B40/B50 Series)
  • BB42, BB50, BB53 (1990-2007)
  • RZB40, RZB50, RZB53, RZB54
  • HZB50, XZB53, TRB53
  • Engines: 14B, 1HZ, 2TR-FE
Toyota Dyna / ToyoAce
  • XZU301, XZU341, XZU362, XZU372, XZU382 (05.1999-06.2004)
  • XZU368, XZU378, XZU388 (06.2004-05.2007)
  • RZU300, XZU300, XZU31#, XZU321, XZU331, XZU334, XZU346
  • BU30#, BU346
Important fitment note: This drum is used on the rear axle of these vehicles. Always verify your vehicle's chassis code and production date before ordering.
Features & Benefits
HT250 Grey Cast Iron Construction

Provides excellent thermal conductivity for quick heat dissipation and reduced brake fade. Natural graphite lubrication reduces brake squeal and extends lining life.

Precision-Machined Friction Surface

320 mm inner diameter ensures consistent contact with brake shoes for smooth, predictable braking performance.

Dynamically Balanced

Prevents vibration during high-speed operation, eliminating pedal pulsation and premature wear on suspension components.

Corrosion-Resistant Coating

Protective coating on non-friction surfaces resists moisture, road salt, and brake dust, extending service life.

Direct OE Replacement

Exact Toyota part number 42431-37080 ensures direct bolt-on replacement with no modifications required.

Quality Control
QC ItemVerification Method
Material compositionSpectrographic analysis - HT250 grey cast iron grade confirmed
Inner diameterPrecision measurement - 320 mm ±0.5 mm
Outer diameterPrecision measurement - 373.9 - 375 mm
Overall heightPrecision measurement - 128.7 - 129 mm
Run-outDial gauge measurement - within OE tolerance
Dynamic balanceSpin-balanced at operating speed
HardnessBrinell hardness test - confirmed to HT250 specification
Visual inspection100% - no casting defects, porosity, or cracks

Certificate of conformance (COC) with batch test data available for wholesale orders.

Installation & Maintenance
⚠️ IMPORTANT: Brake drum replacement is a safety-critical procedure. Professional installation by a qualified mechanic is strongly recommended. Incorrect installation can lead to brake failure and serious accidents.
Replacement Symptoms
SymptomDiagnosis
Pulsating brake pedal during brakingWarped or out-of-round drum - immediate inspection required
Reduced braking performance or increased stopping distanceWorn friction surface or drum exceeding maximum diameter
Squealing or grinding noise from rear wheelsWorn brake shoes scoring the drum surface
Visible scoring, grooves, or cracksDrum damage - replace immediately
Vehicle fails brake inspectionDrum diameter exceeds maximum allowable specification
Critical Installation Notes
  • Measure the drum inner diameter before installation
  • Clean the hub mounting surface thoroughly
  • Inspect and replace brake shoes if worn
  • Check wheel cylinders for leaks or corrosion
  • Adjust brake shoes to correct clearance
  • Bleed the brake system if hydraulic components were opened
  • Bed in new drums with gentle stops from low speed
  • Retorque wheel nuts after first 100 km of driving
Packaging & Supply
Individual Packaging

Sealed in anti-rust VCI bag, foam-lined carton

Carton Dimensions

Approximately 38 × 38 × 15 cm

Net Weight

14 kg

Master Carton

20 units per export carton (palletisable)

Lead Time

3-7 days (stock); 15-25 days (production)

Minimum Order

1 piece (sample available)

Shipping

FedEx/UPS/DHL (samples); Sea freight (bulk)

H/S Code

8708.30

Quick Summary

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.

Before ordering: Confirm your vehicle's chassis code and production date. The maximum allowable inner diameter is stamped on the drum - if your existing drum exceeds this specification, replacement is required.
Tags: 

Toyota RAV4 headlamp assembly,

Toyota Starlet cylinder head with warranty,

Lexus GS350 replacement motor

Yimi (Guangzhou) Automotive Parts Co, Ltd
4F, 7th, No. 2, South Jinguu Road, Huadong Town, Huadu District, Guangzhou City
Tel: +86-17820569171
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