Suspension Upper Control Arm 48602-39025 For TOYOTA Coaster BB50 BB42 HZB50 XZB50 BZB40 RZB40 — OEM Verified Direct Fit, Front Upper LH, Steel

The Front Upper Suspension Control Arm with OEM number 48602-39025 is a verified direct-fit replacement for TOYOTA Coaster series buses. This control arm is a critical suspension component that serves as a key link between the chassis and the front wheel steering knuckle on the upper left (LH) side, responsible for maintaining correct wheel position while the suspension moves up and down over bumps. A tight, true arm helps the vehicle track straight, steer smoothly, and keeps tire wear under control.

The OEM part 48602-39025 corresponds to "ARM SUB-ASSY, FRONT SUSPENSION, UPPER LH" with the parts catalog code 48067. This control arm pivots on its inner bushings and supports the outer joint connection to the steering knuckle. As the wheel travels, the arm guides camber and caster angles, absorbing road shock through rubber bushings while maintaining precise geometry. This reduces vibration, improves stability, and supports safe braking and cornering.

• OEM Number Verified: 48602-39025 — Original Toyota part number, corresponding to ARM SUB-ASSY, FRONT SUSPENSION, UPPER LH, catalog code 48067.
• Vehicle Application Verified: Confirmed fitment across TOYOTA Coaster models including BB50, BB42, HZB50, XZB50, BZB40, RZB40 from 1993 to 2016.
• Weight Verified: 13.464 kg gross weight per OEM parts catalog specification.
• Position Verified: Front Upper Left (LH) — paired counterpart is 48601-39025 (Front Upper RH).
• Multi-Platform Application: Confirmed compatible with a wide range of Coaster chassis codes covering both diesel and gasoline engine variants, left-hand and right-hand drive configurations.
• Cross-Reference Available: Paired with 48605-39015 and 48606-39015 (lower control arms) for complete front suspension rebuild.

• Clunking or knocking noise from front suspension: Audible thumping when driving over bumps or during steering — indicates worn bushings or ball joint play.
• Loose or vague steering feel: Excessive free play in the steering wheel, requiring constant correction — a worn control arm allows the wheel to shift under load.
• Vehicle pulling to one side: Alignment shifts as worn bushings allow the control arm to move, causing the vehicle to drift or pull.
• Uneven or rapid tire wear: Incorrect camber and caster angles from a worn control arm cause tire cupping, feathering, or rapid shoulder wear.
• Visible bushing degradation: Cracked, swollen, or oil-contaminated rubber bushings — loss of structural integrity requires immediate replacement.

Confirmed Fitment Sources: Toyota electronic parts catalogs confirm 48602-39025 as the upper left suspension arm for COASTER models from 1997.05 to 2016 across BB4#, BB5#, HZB50, RZB40,5, XZB40,50, and BZB40,50 chassis codes. The part is also listed in the Toyota Parts Catalog for COASTER 2014 BB42R-BRMRS.

• Position: This is the front upper left (LH) control arm. The paired counterpart for the front upper right (RH) uses OEM 48601-39025.
• Previous Generation Reference: For earlier Coaster models (1982–1993), the equivalent part number was 48602-36010. Always verify the correct part number for your specific production year.
• Bushings Not Included: This control arm is supplied without bushings. Inspect existing bushings and replace if worn or cracked. Related bushing part numbers include 48655-36010 and 48061-36020.
• Professional Alignment Required: After installation, a professional wheel alignment is mandatory to restore correct camber and caster angles.
• Always verify OEM number against the vehicle documentation or chassis plate before ordering.
• VIN Verification Recommended: Different production batches and market specifications may vary. Providing your VIN (vehicle identification number) at the time of inquiry ensures accurate fitment.

Each unit undergoes 100% quality inspection before packaging. Manufacturing conforms to OEM specification standards for suspension control arm applications.

1. Safety first: Park on level ground, engage parking brake, and chock rear wheels. Loosen front wheel lug nuts. Raise and support the vehicle securely with jack stands.
2. Remove front wheel: Remove the wheel to access the suspension components.
3. Support lower suspension: Place a jack under the lower control arm to support the suspension spring load.
4. Disconnect ball joint: Remove the cotter pin and nut securing the upper ball joint to the steering knuckle. Use a ball joint separator to disconnect the ball joint from the knuckle.
5. Remove mounting bolts: Remove the bolts securing the control arm to the chassis frame. Note the orientation of any shims, washers, or camber adjustment plates.
6. Remove old control arm: Extract the old control arm from the vehicle. Inspect the mounting area for rust, cracks, or deformation.
7. Install new control arm: Position the new control arm (48602-39025) onto the mounting points. Insert mounting bolts and hand-tighten.
8. Torque mounting bolts: Tighten mounting bolts to the TOYOTA Coaster workshop manual specification.
9. Reconnect ball joint: Insert the ball joint stud into the steering knuckle, install the nut, and torque to specification. Install a new cotter pin.
10. Reinstall wheel: Reinstall the wheel and lower the vehicle.
11. Professional alignment: Perform a professional wheel alignment to restore correct camber and caster angles.
12. Road test: Test drive at low speed, checking for abnormal noise, vibration, or steering pull.

• Inspect control arm bushings at every 40,000–50,000 km or during any suspension service.
• Check ball joint play at every oil change — excessive play requires immediate attention.
• Replace control arm bushings every 80,000–100,000 km or if cracked, swollen, or oil-contaminated.
• Professional alignment recommended after any suspension component replacement or if uneven tire wear is observed.
• Replace in pairs when possible: If one upper control arm has failed, the opposite side may be nearing the end of its service life. Consider replacing both simultaneously for balanced suspension performance.

• Standard packing: Neutral packaging in corrugated carton with anti-rust paper; wooden pallet available for bulk orders.
• Package contents: 1 × Front Upper Suspension Control Arm (bushings and hardware not included).
• Set options: Left side only, right side only, or left + right pair — specify at inquiry.
• Suitable for: Bus repair workshops, fleet maintenance departments, spare parts distributors, and export wholesalers.
• Related parts available: Front upper right control arm (48601-39025), lower control arms (48605-39015, 48606-39015), control arm bushings (48655-36010, 48061-36020), upper ball joints (43350-39095), and complete front suspension rebuild kits.