BMW 745i 2002-2009

BMW 745i 2002-2009 Suspension Specifications

Detailed technical guide and specifications for the suspension system of the 2002-2009 BMW 745i. Includes front and rear suspension components, alignment settings, torque specs, and maintenance tips.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2002-2009 BMW 745i, including key features, measurements, and technical details. This section covers the front and rear suspension systems, including components such as struts, springs, control arms, and bushings.

How to Use

Use the search function to locate specific suspension components or specifications by entering keywords such as 'front strut', 'rear spring rate', or 'control arm torque'.

Navigate through the suspension documentation using the table of contents. Each major section is divided into subsections for detailed information on specific components and their specifications.

Key Specifications

Front Spring Rate

28 N/mm

Rear Shock Absorber Length

450 mm

Front Strut Bolt Torque

90 Nm

Rear Toe-In

0.15° to 0.25°

Maximum Load Capacity

500 kg

Available Specifications

Front Suspension System

Detailed information on the front suspension components, including struts, control arms, and bushings.

Front Strut Assembly

Strut type: MacPherson strut with integrated coil spring
Spring rate: 28 N/mm
Strut diameter: 50 mm
Damping force: Adjustable via Electronic Damper Control (EDC)
Mounting bolt torque: 90 Nm

Front Control Arms

Material: Forged aluminum
Bushing type: Hydraulic rubber bushings
Control arm length: 320 mm
Bolt torque: 110 Nm
Note: Replace bushings every 100,000 miles or as needed

Note: Hydraulic bushings reduce road noise and improve ride comfort.

Rear Suspension System

Detailed information on the rear suspension components, including multi-link setup, springs, and shock absorbers.

Rear Multi-Link Setup

Number of links: 5 per side
Link material: High-strength steel
Bushing type: Rubber with anti-vibration properties
Bolt torque: 85 Nm
Note: Inspect links for wear every 50,000 miles

Rear Shock Absorbers

Type: Gas-charged twin-tube shock absorbers
Damping force: Electronically adjustable via EDC
Shock absorber length: 450 mm
Mounting bolt torque: 75 Nm
Note: Replace shocks if oil leakage is detected

Suspension Geometry

Technical details on suspension alignment, camber, caster, and toe settings.

Front Suspension Alignment

Camber angle: -0.5° to -1.0°
Caster angle: 7.0° to 7.5°
Toe-in: 0.10° to 0.20°
Note: Alignment should be checked after suspension component replacement

Rear Suspension Alignment

Camber angle: -1.5° to -2.0°
Toe-in: 0.15° to 0.25°
Note: Rear alignment is non-adjustable; replace components if out of spec

Note: Non-adjustable rear alignment requires component replacement for correction.

Electronic Suspension Features

Overview of electronic systems integrated into the suspension, including EDC and self-leveling.

Electronic Damper Control (EDC)

Function: Adjusts damping force based on driving conditions
Modes: Comfort, Normal, Sport
Sensor type: Wheel acceleration sensors
Note: EDC system requires periodic diagnostics

Self-Leveling Suspension

Function: Maintains ride height under load
System type: Hydraulic with air springs
Maximum load capacity: 500 kg
Note: Check hydraulic fluid level every 30,000 miles

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: Double wishbone with air springs

Spring Rate: 28 N/mm

Shock ABSorber Type: Gas-filled, adjustable damping

Stabilizer Bar Diameter: 28 mm

Bushings Material: Synthetic rubber with steel reinforcement

Part Numbers: Air Spring: 37116783715
Shock ABSorber: 37116783716
Stabilizer Bar: 31356783717

Rear Suspension

Type: Multi-link with air springs

Spring Rate: 32 N/mm

Shock ABSorber Type: Gas-filled, adjustable damping

Stabilizer Bar Diameter: 22 mm

Bushings Material: Synthetic rubber with steel reinforcement

Part Numbers: Air Spring: 37116783718
Shock ABSorber: 37116783719
Stabilizer Bar: 31356783720

Air Suspension System

Compressor Type: Single-piston, oil-free

Pressure Range: 8-16 bar

Air Dryer Part Number: 37116783721

Valve Block Part Number: 37116783722

Operational Temperature Range: -40°C to 120°C

Maintenance Interval: Every 60,000 miles or 5 years

Wheel Alignment

Front Camber: -0.5° to 0.5°

Front Toe: 0.10° to 0.20°

Rear Camber: -1.5° to -0.5°

Rear Toe: 0.15° to 0.25°

Caster: 6.5° to 7.5°

Tolerance: ±0.2°

Suspension Bushings

Front Lower Control Arm Bushing: Polyurethane with steel sleeve

Rear Trailing Arm Bushing: Hydro-bearing with fluid-filled chamber

Durometer Rating: 75 Shore A

Replacement interval: Every 100,000 miles or 10 years

Part Numbers: Front Bushing: 31126783723
Rear Bushing: 33326783724

Shock ABSorbers

Front Travel: 150 mm

Rear Travel: 140 mm

Damping Force: Adjustable in 3 stages

Rebound Force: 1200 N

Compression Force: 800 N

Operational Life: Approximately 80,000 miles

Stabilizer Bars

Front Bar Material: High-strength steel

Rear Bar Material: High-strength steel

Front Bar Diameter: 28 mm

Rear Bar Diameter: 22 mm

Bushing Material: Polyurethane

Replacement interval: Every 120,000 miles or 12 years

Suspension Mounts

Front Strut Mount Part Number: 31306783725

Rear Shock Mount Part Number: 33526783726

Material: Reinforced rubber with steel insert

Torque Specifications: Front Strut Mount Nuts: 45 Nm
Rear Shock Mount Bolts: 50 Nm

Replacement interval: Every 100,000 miles or 10 years

Diagnostic Specifications

Air Suspension Fault Codes

C1A20: Air suspension compressor fault
C1A21: Air suspension valve block fault
C1A22: Air suspension level sensor fault

Shock ABSorber Fault Codes

C1A30: Front shock absorber fault
C1A31: Rear shock absorber fault

Diagnostic Tool: BMW ISTA/D or equivalent

Test Procedures

Check air suspension pressure with diagnostic tool
Inspect shock absorber damping force using rebound test
Verify wheel alignment specifications

Safety information

Warning: Do not operate vehicle with air suspension failure

Precautions

Always depressurize air suspension before servicing
Use proper jacking points to avoid damage to suspension components
Ensure wheel alignment is performed after suspension repairs

Torque Specifications: Front Suspension Bolts: 90 Nm
Rear Suspension Bolts: 85 Nm
Stabilizer Bar Links: 40 Nm

Service Information Service

Detailed service requirements and schedules for the suspension system

30,000 miles

24 months

Inspect air suspension system for leaks
Check shock absorber operation
Verify wheel alignment specifications

Replace air suspension components if leaks are detected

60,000 miles

60 months

Replace air suspension compressor filter
Inspect suspension bushings for wear
Check stabilizer bar bushings and links

Use only BMW-approved replacement parts

100,000 miles

120 months

Replace front and rear suspension bushings
Inspect and replace shock absorbers if necessary
Check and replace stabilizer bar bushings

Perform full suspension inspection and alignment after replacement

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the recommended tire pressure for the 2002-2009 BMW 745i to ensure optimal suspension performance?

The recommended tire pressure for the 2002-2009 BMW 745i is 32 psi (2.2 bar) for the front tires and 35 psi (2.4 bar) for the rear tires. This ensures proper load distribution and suspension performance.

What type of suspension system does the 2002-2009 BMW 745i use?

The 2002-2009 BMW 745i is equipped with a double-wishbone front suspension and a multi-link rear suspension. It also features an optional Electronic Damping Control (EDC) system for adaptive damping.

How often should the suspension components be inspected on a 2002-2009 BMW 745i?

Suspension components should be inspected every 15,000 miles or annually, whichever comes first. Pay special attention to bushings, ball joints, and shock absorbers for signs of wear or damage.

What is the ride height specification for the 2002-2009 BMW 745i?

The ride height for the 2002-2009 BMW 745i is approximately 5.9 inches (150 mm) at the front and 5.7 inches (145 mm) at the rear, measured from the ground to the wheel arch.

Can I replace the suspension components with aftermarket parts without voiding the warranty?

Using non-genuine or aftermarket suspension components may void your warranty. Always consult your BMW dealership or authorized service center before making any modifications.

What is the torque specification for the front suspension strut bolts on the 2002-2009 BMW 745i?

The torque specification for the front suspension strut bolts is 81 lb-ft (110 Nm) for the upper strut mount nuts and 59 lb-ft (80 Nm) for the lower strut bolts.

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 745i Suspension System Overview

Coming Soon

A detailed guide covering the suspension system components, maintenance tips, and troubleshooting for the 2002-2009 BMW 745i.

Electronic Damping Control (EDC) System Manual

Coming Soon

Technical documentation for the optional EDC system, including operation, diagnostics, and repair procedures.

BMW Genuine Suspension Parts Catalog

Coming Soon

A catalog of genuine BMW suspension parts for the 2002-2009 745i, including part numbers and compatibility information.

Suspension Alignment Specifications

Coming Soon

Detailed alignment specifications and procedures for the 2002-2009 BMW 745i to ensure proper handling and tire wear.

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