Lower Control Arm 48606-39015 for Toyota Coaster HZB50 BB50 — OEM Front Left Suspension
| OEM Part Number: | 48606-39015 / 4860639015 | Part Name: | ARM SUB-ASSY, FRONT SUSPENSION, LOWER NO.1 LH |
| Fitting Position: | Front Axle, Lower, Left-Hand (LH) | Weight: | Approx. 6.4 Kg |
| Material: | High-Tensile Steel / Forged Aluminum | Finish: | E-coat / Powder Paint / Zinc Plating |
| Design: | Forged / Stamped Steel Construction | Manufacturer: | Toyota Motor Corporation |
| Country of Origin: | Japan | Vehicle Compatibility: | Toyota Coaster (B4, B5) |
| Production Period: | 1993–2016+ | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 12–24 Months | ||
| High Light: | Lower Control Arm for Toyota Coaster,OEM front left suspension arm,Toyota Coaster HZB50 BB50 control arm |
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The Front Lower Control Arm Assembly (ARM SUB-ASSY, FRONT SUSPENSION, LOWER NO.1 LH) with Genuine Toyota OEM number 48606-39015 (also listed as 4860639015) is a verified direct-fit replacement for Toyota Coaster buses. As a critical component of the front suspension system, this lower control arm connects the chassis to the steering knuckle, maintaining proper wheel alignment and ensuring stable, predictable handling.
- Real Shop Test Data: Precision-engineered suspension component with 6.4 kg weight — verified against Toyota OEM specifications
- Proven Durability: Constructed from high-tensile steel with corrosion-resistant E-coat/powder paint finish — rated for 200,000+ km under normal operation
- Installation Success Rate: 99% direct bolt-on fitment — confirmed across thousands of repair orders
- OEM Cross-Reference Verified: Replaces 48606-39015, 4860639015
If your lower control arm is failing, you may experience one or more of the following symptoms:
- Clunking or Knocking Noises: Metallic sounds from the front suspension when driving over bumps or turning
- Uneven or Rapid Tire Wear: Premature or irregular tire wear patterns due to compromised alignment
- Vibration Through Steering Wheel: Noticeable vibrations felt in the steering wheel, floorboard, or seats while driving
- Vehicle Pulls to One Side: The Coaster drifts left or right while driving on a straight road
- Loose or Unstable Steering: Wandering feeling and difficulty maintaining a straight line
- Excessive Tire Movement or Uneven Ride Height: Visible tire movement or sagging on one side
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| Toyota | Coaster | HZB50R / HZB50L | 1HZ 4.2L Diesel | 01/1993-01/2005 |
| Toyota | Coaster | HZB40 | 1HZ 4.2L Diesel | 01/1993-08/2008 |
| Toyota | Coaster | BB50R / BB50L | 15B-FTE 4.1L Diesel | 01/1993-08/2006 |
| Toyota | Coaster | HZB60R | 1HZ 4.2L Diesel | 01/2016-01/2017 |
| Toyota | Coaster | HZB70L | 1HZ 4.2L Diesel | 01/2017- |
| Feature | Benefit + Verification Signal |
|---|---|
| Genuine Toyota OEM Specification | Guarantees factory-fit quality and performance — verified by Toyota part number 48606-39015 |
| High-Tensile Steel / Forged Aluminum Construction | Provides exceptional durability under heavy loads and harsh road conditions — verified by material specifications |
| Corrosion-Resistant E-coat / Powder Paint Finish | Protects against rust and extends service life in harsh environments — verified by salt fog testing |
| Precision-Engineered for Commercial Use | Engineered for the demanding conditions of bus and commercial vehicle operation — verified by Toyota heavy-duty suspension standards |
| Direct Bolt-On Fitment | No modifications required — verified by 99% installation success rate |
| Complete Quality Testing | Chemical analysis, hardness test, surface test, dimension check, salt fog test, and fatigue test — verified by IATF/ISO-based process control |
| QC Item | Verification Method |
|---|---|
| Chemical Analysis | Material composition verification to ensure high-tensile steel specification |
| Hardness Test | Hardness verification to ensure structural integrity under load |
| Surface Test | Corrosion-resistant coating thickness and adhesion verification |
| Dimension Check | Precision inspection to verify all mounting points, bushing fitment, and geometry match OE blueprint specifications |
| Salt Fog Test | Corrosion resistance testing to verify long-term durability |
| Fatigue Test | 500+ hour durability testing to verify 200,000+ km service life |
The lower control arm is a critical suspension component. Replacement requires specialized tools and expert knowledge of front suspension systems.
Pre-Installation Checklist:
- Safely raise the vehicle and support it on jack stands
- Verify you are replacing the correct side — this is the Left-Hand (LH) side
- Inspect the ball joint, bushings, and related components for wear — replace as necessary
- A front-end alignment is required after installation
- Use new mounting bolts and nuts as recommended by the workshop manual
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check for clunking noises, uneven tire wear, and visible damage
- Replacement: Immediately if failure symptoms appear
- Note: The lower control arm works in conjunction with the upper control arm and stabilizer bar — inspect all suspension components during service
- Packaging: Each lower control arm is securely packed in protective packaging to prevent shipping damage
- Warranty: 12-24 months
- Suitable for: Wholesale distributors, bus parts retailers, commercial vehicle repair shops, and fleet owners
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