BMW 440i 2017-present Suspension Specifications
Comprehensive technical specifications for the suspension system of the 2017-Present BMW 440i, including front and rear suspension components, alignment settings, spring rates, shock absorber details, and torque values.
Overview Specifications
Comprehensive description of the suspension specifications for the 2017-Present BMW 440i, including key features, measurements, and technical details. This guide covers front and rear suspension systems, alignment specifications, and component-specific details.
How to Use
Use the search function to locate specific suspension components or specifications by entering keywords such as 'front strut', 'rear axle', or 'alignment angles'.
Navigate through the suspension documentation sections using the table of contents. Each section is organized by major suspension components and their respective subsections.
Key Specifications
Front Spring Rate
28 N/mm
Rear Spring Rate
32 N/mm
Front Strut Diameter
55 mm
Rear Track Width
1570 mm
Front Anti-Roll Bar Diameter
26 mm
Available Specifications
Front Suspension
Details of the front suspension system, including strut assembly, control arms, and steering components.
Front Suspension
Details of the front suspension system, including strut assembly, control arms, and steering components.
Strut Assembly
- MacPherson strut design with coil spring and integrated shock absorber
- Strut diameter: 55 mm
- Spring rate: 28 N/mm
- Upper strut mount material: reinforced rubber with aluminum housing
Control Arms
- Lower control arms made of forged aluminum
- Bushings: hydraulic rubber for improved vibration damping
- Control arm length: 420 mm
- Ball joint type: maintenance-free, sealed
Note: Regular inspection of control arm bushings is recommended to ensure optimal performance.
Rear Suspension
Details of the rear suspension system, including multi-link setup, springs, and dampers.
Rear Suspension
Details of the rear suspension system, including multi-link setup, springs, and dampers.
Multi-Link Setup
- Five-link independent rear suspension
- Trailing arm length: 320 mm
- Upper and lower control arms made of lightweight steel
- Bushings: polyurethane for enhanced durability
Springs and Dampers
- Coil spring rate: 32 N/mm
- Shock absorber type: twin-tube gas-filled
- Rear damper travel: 120 mm
- Spring material: high-strength steel
Note: Rear suspension tuning is optimized for a balance between comfort and sporty handling.
Alignment Specifications
Detailed alignment settings for the BMW 440i, including camber, caster, and toe angles.
Alignment Specifications
Detailed alignment settings for the BMW 440i, including camber, caster, and toe angles.
Front Alignment
- Camber angle: -0.5° to -1.0°
- Caster angle: 7.2° to 7.8°
- Toe angle: 0.10° to 0.20° (toe-in)
- Steering axis inclination: 12.5°
Rear Alignment
- Camber angle: -1.8° to -2.2°
- Toe angle: 0.15° to 0.25° (toe-in)
- Thrust angle: 0.0° ± 0.1°
- Track width: 1570 mm
Note: Alignment settings may vary slightly depending on optional suspension packages.
Suspension Components
Technical details of key suspension components, including materials, dimensions, and specifications.
Suspension Components
Technical details of key suspension components, including materials, dimensions, and specifications.
Anti-Roll Bars
- Front anti-roll bar diameter: 26 mm
- Rear anti-roll bar diameter: 18 mm
- Material: hollow steel for reduced weight
- Bushings: polyurethane with graphite coating
Wheel Bearings
- Front wheel bearing type: sealed double-row ball bearing
- Rear wheel bearing type: tapered roller bearing
- Bearing load capacity: 12,000 N (front), 10,000 N (rear)
- Hub material: forged steel
Note: Wheel bearings are designed for high load capacity and long service life.
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Component Specifications
Front Suspension
- Type
- Double-wishbone with coil springs
- Spring Rate
- 28 N/mm
- Shock ABSorber Type
- Gas-filled monotube
- Stabilizer Bar Diameter
- 25.5 mm
- Bushings Material
- Synthetic rubber with aluminum housing
- Part Numbers
- Strut Assembly: 31-31-6-857-367Coil Spring: 31-33-6-857-369Stabilizer Bar Link: 31-35-6-857-371
Rear Suspension
- Type
- Five-link independent suspension
- Spring Rate
- 32 N/mm
- Shock ABSorber Type
- Gas-filled monotube
- Stabilizer Bar Diameter
- 20 mm
- Bushings Material
- Synthetic rubber with aluminum housing
- Part Numbers
- Trailing Arm: 33-32-6-857-372Coil Spring: 33-33-6-857-374Stabilizer Bar Link: 33-35-6-857-376
Shock ABSorbers
- Front
- Type: Adaptive M Suspension (optional)Travel: 120 mmDamping Force: Adjustable electronicallyPart Number: 31-31-6-857-368
- Rear
- Type: Adaptive M Suspension (optional)Travel: 110 mmDamping Force: Adjustable electronicallyPart Number: 33-32-6-857-373
Wheel Alignment
- Front
- Camber: -0.5° to -1.0°Toe: 0.10° to 0.20°Caster: 7.0° to 7.5°
- Rear
- Camber: -1.5° to -2.0°Toe: 0.15° to 0.25°
Suspension Bushings
- Front Lower Control Arm
- Material: PolyurethaneDurometer: 75 Shore APart Number: 31-12-6-857-365
- Rear Trailing Arm
- Material: PolyurethaneDurometer: 80 Shore APart Number: 33-12-6-857-366
Stabilizer Bars
- Front
- Diameter: 25.5 mmMaterial: High-strength steelPart Number: 31-35-6-857-370
- Rear
- Diameter: 20 mmMaterial: High-strength steelPart Number: 33-35-6-857-375
Suspension Mounts
- Front Strut Mount
- Material: Reinforced rubber with steel insertPart Number: 31-31-6-857-364
- Rear Shock Mount
- Material: Reinforced rubber with steel insertPart Number: 33-32-6-857-363
Operational Limits
- Maximum Load
- 550 kg
- Maximum Speed With Load
- 210 km/h
- Temperature Range
- -40°C to 120°C
Diagnostic Specifications
- Ride Height Tolerance
- ±5 mm
- Shock ABSorber Leak Test
- No visible leakage after 100,000 km
- Bushing Wear Limit
- 2 mm play maximum
Maintenance Specifications
- Torque Specifications
- Front Strut Nut: 90 NmRear Shock ABSorber Bolt: 110 NmStabilizer Bar Link Nut: 45 Nm
- Lubrication Points
-
- Front lower control arm bushings
- Rear trailing arm bushings
- inspection Intervals
- Miles: Every 15,000 milesMonths: Every 12 monthsItems: Check for bushing wear, Inspect shock absorbers for leaks, Verify ride height
Service Information Service
Detailed service requirements and schedules for the suspension system
- Inspect suspension bushings for wear
- Check shock absorbers for leaks
- Verify wheel alignment
Replace worn components immediately to avoid further damage
- Lubricate suspension bushings
- Inspect stabilizer bar links
- Check suspension mounts for cracks
Use only BMW-approved lubricants and parts
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of suspension system does the 2017-Present BMW 440i use?
What type of suspension system does the 2017-Present BMW 440i use?
The 2017-Present BMW 440i is equipped with a double-joint spring strut front axle and a five-link rear axle. This setup provides a balance of sporty handling and ride comfort. The front suspension features aluminum components to reduce unsprung weight, while the rear suspension is designed for precise wheel control and stability.
Q2 What is the recommended tire pressure for the BMW 440i to maintain optimal suspension performance?
What is the recommended tire pressure for the BMW 440i to maintain optimal suspension performance?
The recommended tire pressure for the BMW 440i varies based on load and driving conditions. For normal driving, the front tires should be inflated to 32 psi (2.2 bar) and the rear tires to 35 psi (2.4 bar). For high-speed driving or heavy loads, increase the pressure to 36 psi (2.5 bar) in the front and 39 psi (2.7 bar) in the rear. Always refer to the tire pressure label on the driver's door jamb for specific recommendations.
Q3 How often should the suspension components be inspected on a BMW 440i?
How often should the suspension components be inspected on a BMW 440i?
BMW recommends inspecting the suspension components every 10,000 miles or at least once a year. Key components to check include the shock absorbers, struts, bushings, and control arms. Regular inspections help identify wear and tear early, ensuring optimal performance and safety.
Q4 Can the BMW 440i suspension be upgraded for better performance?
Can the BMW 440i suspension be upgraded for better performance?
Yes, the BMW 440i suspension can be upgraded with aftermarket or BMW Performance parts. Options include adjustable coilovers, stiffer sway bars, and performance strut braces. However, any modifications should be performed by a certified technician to ensure compatibility and maintain warranty coverage.
Q5 What is the ride height of the BMW 440i, and can it be adjusted?
What is the ride height of the BMW 440i, and can it be adjusted?
The standard ride height of the BMW 440i is approximately 5.5 inches (140 mm) at the front and 5.7 inches (145 mm) at the rear. The ride height can be adjusted using aftermarket lowering springs or air suspension systems, but this may affect the vehicle's warranty and should be done by a professional.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
BMW 440i Suspension Maintenance Guide
Coming SoonA detailed guide on maintaining and inspecting the suspension system of the BMW 440i, including step-by-step procedures and safety tips.
BMW Genuine Suspension Parts Catalog
Coming SoonExplore the official catalog of genuine BMW suspension parts for the 440i, ensuring compatibility and optimal performance.
BMW 440i Suspension Upgrade Options
Coming SoonLearn about performance-enhancing suspension upgrades available for the BMW 440i, including installation guidelines and warranty considerations.
BMW Technical Service Bulletins (TSBs)
Coming SoonAccess the latest technical service bulletins related to the suspension system of the BMW 440i, addressing common issues and recommended fixes.
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