BMW 640i 2011-2018 Suspension Specifications
Comprehensive technical specifications for the 2011-2018 BMW 640i suspension system, including front and rear suspension components, alignment settings, torque values, and maintenance procedures.
Overview Specifications
Comprehensive description of the suspension specifications for the 2011-2018 BMW 640I, including key features, measurements, and technical details. This section covers front and rear suspension systems, alignment specifications, and component-specific details.
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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 major section is divided into subsections for detailed technical information.
Key Specifications
Front Spring Rate
28 N/mm
Rear Spring Rate
32 N/mm
Front Strut Diameter
55 mm
Rear Damper Stroke
120 mm
Front Camber Angle
-0.5° to -1.0°
Available Specifications
Front Suspension System
Detailed information about the front suspension components, including struts, control arms, and steering knuckles.
Front Suspension System
Detailed information about the front suspension components, including struts, control arms, and steering knuckles.
Front Strut Assembly
- MacPherson strut design with integrated coil spring
- Strut diameter: 55 mm
- Spring rate: 28 N/mm
- Bump stop length: 70 mm
- Strut mount bearing type: Ball-and-socket
Front Control Arms
- Upper control arm material: Forged aluminum
- Lower control arm material: Cast iron
- Bushings: Hydraulic rubber bushings
- Control arm length: 320 mm
- Bushing durometer: 70 Shore A
Note: Regular inspection of bushings is recommended to prevent premature wear.
Rear Suspension System
Technical details of the rear suspension, including multi-link setup, springs, and dampers.
Rear Suspension System
Technical details of the rear suspension, including multi-link setup, springs, and dampers.
Rear Multi-Link Setup
- Five-link independent suspension design
- Trailing arm length: 450 mm
- Upper link material: Forged aluminum
- Lower link material: Cast iron
- Bushing type: Hydroelastic
Rear Springs and Dampers
- Coil spring rate: 32 N/mm
- Damper type: Twin-tube gas-charged
- Damper stroke: 120 mm
- Spring free length: 380 mm
- Damper diameter: 50 mm
Note: Ensure proper alignment after replacing rear suspension components.
Alignment Specifications
Alignment angles and settings for optimal handling and tire wear.
Alignment Specifications
Alignment angles and settings for optimal handling and tire wear.
Front Alignment
- Camber angle: -0.5° to -1.0°
- Caster angle: 7.0° to 7.5°
- Toe-in: 0.10° to 0.20°
- Steering axis inclination: 12.5°
- Maximum turning angle: 35°
Rear Alignment
- Camber angle: -1.5° to -2.0°
- Toe-in: 0.15° to 0.25°
- Thrust angle: 0°
- Track width: 1620 mm
- Ride height: 140 mm
Note: Alignment should be checked after any suspension modifications.
Suspension Components
Detailed specifications for individual suspension components.
Suspension Components
Detailed specifications for individual suspension components.
Anti-Roll Bars
- Front anti-roll bar diameter: 28 mm
- Rear anti-roll bar diameter: 20 mm
- Material: High-strength steel
- Bushing durometer: 75 Shore A
- Mounting type: Rubber-insulated clamps
Wheel Bearings
- Front wheel bearing type: Sealed ball bearing
- Rear wheel bearing type: Tapered roller bearing
- Bearing OD: 80 mm
- Bearing ID: 42 mm
- Load rating: 12,000 N
Note: Wheel bearings are non-serviceable and must be replaced as a unit.
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Component Specifications
Front Suspension
- Type
- Double wishbone with coil springs and anti-roll bar
- Spring Rate
- 32 N/mm
- Shock ABSorber Type
- Gas-filled, monotube
- Anti Roll Bar Diameter
- 25.5 mm
- Bushings Material
- Synthetic rubber with steel reinforcement
- Part Numbers
- Strut Assembly: 31316785001Coil Spring: 31336785002Anti Roll Bar: 31356785003
Rear Suspension
- Type
- Multi-link with coil springs and anti-roll bar
- Spring Rate
- 28 N/mm
- Shock ABSorber Type
- Gas-filled, monotube
- Anti Roll Bar Diameter
- 22 mm
- Bushings Material
- Synthetic rubber with steel reinforcement
- Part Numbers
- Strut Assembly: 33526785001Coil Spring: 33536785002Anti Roll Bar: 33556785003
Shock ABSorbers
- Front
- Type: Monotube, gas-filledStroke Length: 150 mmDiameter: 45 mmOperating Temperature Range: -40°C to 120°CPart Number: 31316785004
- Rear
- Type: Monotube, gas-filledStroke Length: 140 mmDiameter: 40 mmOperating Temperature Range: -40°C to 120°CPart Number: 33526785004
Coil Springs
- Front
- Free Length: 380 mmWire Diameter: 14 mmMaterial: High-strength steelPart Number: 31336785002
- Rear
- Free Length: 360 mmWire Diameter: 12 mmMaterial: High-strength steelPart Number: 33536785002
Anti Roll Bars
- Front
- Diameter: 25.5 mmMaterial: High-strength steelBushings Material: Synthetic rubberPart Number: 31356785003
- Rear
- Diameter: 22 mmMaterial: High-strength steelBushings Material: Synthetic rubberPart Number: 33556785003
Bushings
- Front Lower Control Arm
- Material: Synthetic rubber with steel reinforcementDurometer Hardness: 70 Shore APart Number: 31126785005
- Rear Trailing Arm
- Material: Synthetic rubber with steel reinforcementDurometer Hardness: 65 Shore APart Number: 33326785005
Alignment Specifications
- Front
- Camber: -0.5° to 0.5°Toe: 0.10° to 0.20°Caster: 7.0° to 7.5°
- Rear
- Camber: -1.5° to -0.5°Toe: 0.10° to 0.20°
Torque Specifications
- Front Strut Mount Nuts
- 50 Nm
- Rear Shock ABSorber Bolts
- 70 Nm
- Anti Roll Bar Link Nuts
- 40 Nm
- Control Arm Bushing Bolts
- 90 Nm
Diagnostic Specifications
- Ride Height Tolerance
- ±5 mm
- Shock ABSorber Leakage Limit
- No visible leakage
- Bushing Wear Limit
- No visible cracks or deformation
Maintenance Specifications
- inspection Interval
- Every 30,000 miles or 24 months
- Lubrication Points
-
- Anti-roll bar bushings
- Control arm bushings
- Replacement intervals
- Shock ABSorbers: Every 60,000 miles or 48 monthsBushings: Every 100,000 miles or 84 months
Service Information Service
Detailed service requirements and schedules for the suspension system
- Inspect shock absorbers for leaks and wear
- Check bushings for cracks and deformation
- Verify alignment specifications
Replace any worn or damaged components immediately
- Replace shock absorbers
- Inspect and lubricate all bushings
- Check and adjust ride height
Use only BMW-approved parts for replacement
- Replace all suspension bushings
- Inspect and replace coil springs if necessary
- Verify torque specifications on all suspension bolts
Perform a full suspension alignment after replacement
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of suspension system does the 2011-2018 BMW 640i use?
What type of suspension system does the 2011-2018 BMW 640i use?
The 2011-2018 BMW 640i is equipped with a double-wishbone front suspension and a multi-link rear suspension. This setup provides a balance of sporty handling and ride comfort. The front suspension features aluminum control arms and struts, while the rear suspension includes multiple links to optimize wheel alignment and stability.
Q2 What is the recommended tire pressure for the BMW 640i suspension system?
What is the recommended tire pressure for the BMW 640i suspension system?
The recommended tire pressure for the BMW 640i varies depending on the tire size and load conditions. For standard 19-inch tires, the front tires should be inflated to 32 psi (2.2 bar) and the rear tires to 35 psi (2.4 bar) under normal load. Always refer to the tire pressure label on the driver's side door jamb for specific recommendations.
Q3 How often should the suspension components be inspected?
How often should the suspension components be inspected?
BMW recommends inspecting the suspension components every 30,000 miles or 24 months, whichever comes first. Key components to check include the shock absorbers, struts, control arms, bushings, and ball joints. Regular inspections help identify wear and tear early, ensuring optimal performance and safety.
Q4 Can the BMW 640i suspension be adjusted for different driving conditions?
Can the BMW 640i suspension be adjusted for different driving conditions?
Yes, the BMW 640i with the optional Adaptive M Suspension allows drivers to adjust the suspension settings. The system offers Comfort, Sport, and Sport+ modes, which adjust damping rates and steering response to suit different driving conditions. This feature enhances both comfort and performance.
Q5 What are the signs of worn suspension components?
What are the signs of worn suspension components?
Common signs of worn suspension components include uneven tire wear, excessive bouncing after hitting bumps, a rough or uncomfortable ride, knocking noises from the suspension, and poor handling or steering response. If any of these symptoms are present, a professional inspection is recommended.
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 640i Suspension Maintenance Guide
Coming SoonA detailed guide on maintaining the suspension system of the BMW 640i, including inspection intervals, common issues, and replacement procedures.
Adaptive M Suspension User Manual
Coming SoonOfficial BMW documentation on using and adjusting the Adaptive M Suspension system for optimal performance and comfort.
BMW Genuine Suspension Parts Catalog
Coming SoonA catalog of genuine BMW suspension parts for the 640i, ensuring compatibility and performance for repairs and replacements.
Suspension Troubleshooting and Repair Tips
Coming SoonStep-by-step troubleshooting and repair tips for common suspension issues in the BMW 640i, including DIY procedures and safety precautions.
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