Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 Suspension Specifications

Comprehensive technical specifications for the suspension system of the 2005-2008 Audi RS4, covering front and rear suspension components, alignment settings, spring rates, shock absorbers, and anti-roll bar details.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2005-2008 Audi RS4, including key features, measurements, and technical details. This section covers the front and rear suspension systems, alignment specifications, and critical components such as shocks, springs, and anti-roll bars.

How to Use

Use the search function to locate specific suspension components or specifications by entering keywords such as 'front suspension', 'rear alignment', or 'spring rates'.

Navigate through the suspension documentation by selecting the relevant section from the table of contents. Each section is organized by component type and includes detailed subsections for measurements, adjustments, and technical notes.

Key Specifications

Front Spring Rate

35 N/mm

Rear Spring Rate

40 N/mm

Front Anti-Roll Bar Diameter

28 mm

Rear Anti-Roll Bar Diameter

22 mm

Ride Height

140 mm

Available Specifications

Front Suspension

Details of the front suspension system, including double wishbone design, shock absorbers, and spring specifications.

Double Wishbone Design

Aluminum double wishbone construction for reduced weight and improved handling
Upper and lower control arms with ball joints for precise wheel alignment
Wheel camber angle: -0.5° to -1.5° (adjustable)
Caster angle: 7.5° to 8.5°
Track width: 1582 mm

Shock Absorbers and Springs

Gas-filled monotube shock absorbers with variable damping
Front spring rate: 35 N/mm
Spring free length: 380 mm
Shock absorber travel: 120 mm
Anti-roll bar diameter: 28 mm

Note: Shock absorbers are electronically adjustable via Audi's Dynamic Ride Control (DRC) system.

Rear Suspension

Technical details of the rear suspension system, including trapezoidal link design, shock absorbers, and spring specifications.

Trapezoidal Link Design

Trapezoidal link rear suspension for optimal stability and handling
Wheel camber angle: -1.2° to -2.2° (adjustable)
Toe angle: 0.1° to 0.3°
Track width: 1562 mm
Subframe mounted with rubber bushings for vibration isolation

Shock Absorbers and Springs

Gas-filled monotube shock absorbers with variable damping
Rear spring rate: 40 N/mm
Spring free length: 420 mm
Shock absorber travel: 110 mm
Anti-roll bar diameter: 22 mm

Note: Rear shock absorbers are also electronically adjustable via the DRC system.

Alignment Specifications

Detailed alignment settings for the front and rear suspension systems, including camber, caster, and toe angles.

Front Alignment

Camber: -0.5° to -1.5°
Caster: 7.5° to 8.5°
Toe: 0.1° to 0.3°
Steering axis inclination: 12.5°
Kingpin inclination: 14.5°

Rear Alignment

Camber: -1.2° to -2.2°
Toe: 0.1° to 0.3°
Thrust angle: 0°
Track width difference: ±2 mm
Ride height: 140 mm (measured from wheel center to fender)

Anti-Roll Bars

Specifications for the front and rear anti-roll bars, including dimensions and material details.

Front Anti-Roll Bar

Diameter: 28 mm
Material: High-strength steel
Bushing diameter: 30 mm
Mounting type: Rubber bushings with brackets
Stiffness: 25% stiffer than standard A4

Rear Anti-Roll Bar

Diameter: 22 mm
Material: High-strength steel
Bushing diameter: 24 mm
Mounting type: Rubber bushings with brackets
Stiffness: 20% stiffer than standard A4

Note: Anti-roll bars are designed to reduce body roll during cornering while maintaining ride comfort.

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: Double wishbone with coil springs and gas-filled shock absorbers

Spring Rate: 45 N/mm

Shock ABSorber Type: Gas-filled monotube

Anti Roll Bar Diameter: 28 mm

Bushings Material: Synthetic rubber with aluminum housing

Part Numbers: Shock ABSorber: 8E0 413 031
Coil Spring: 8E0 411 105
Anti Roll Bar: 8E0 411 305

Rear Suspension

Type: Trapezoidal-link rear suspension with coil springs and gas-filled shock absorbers

Spring Rate: 40 N/mm

Shock ABSorber Type: Gas-filled monotube

Anti Roll Bar Diameter: 22 mm

Bushings Material: Synthetic rubber with aluminum housing

Part Numbers: Shock ABSorber: 8E0 513 031
Coil Spring: 8E0 511 105
Anti Roll Bar: 8E0 511 305

Ride Height

Front: 145 mm (measured from wheel center to fender)

Rear: 150 mm (measured from wheel center to fender)

Tolerance: ±5 mm

Alignment Specifications

Front: Camber: -0.5° to -1.0°
Toe: 0.10° to 0.20° (toe-in)
Caster: 7.5° to 8.5°

Rear: Camber: -1.5° to -2.0°
Toe: 0.15° to 0.25° (toe-in)

Shock ABSorber Specifications

Compression Damping: 1200 N·s/m

Rebound Damping: 1800 N·s/m

Operating Temperature Range: -30°C to 120°C

Maximum Stroke: 150 mm

Anti Roll Bar Specifications

Front Stiffness: 28,000 N·m/rad

Rear Stiffness: 18,000 N·m/rad

Bushing Durometer: 70 Shore A

Bushing Specifications

Front Lower Control Arm Bushing: Material: Synthetic rubber with aluminum housing
Durometer: 75 Shore A
Part Number: 8E0 407 181

Rear Trapezoidal Link Bushing: Material: Synthetic rubber with aluminum housing
Durometer: 70 Shore A
Part Number: 8E0 507 181

Torque Specifications

Front Shock ABSorber Mounting Bolts: 70 N·m

Rear Shock ABSorber Mounting Bolts: 65 N·m

Anti Roll Bar Link Nuts: 40 N·m

Control Arm Bushing Bolts: 90 N·m

Diagnostic Specifications

Shock ABSorber Leak Test: No visible fluid leakage after 100,000 km

Bushing Wear Limit: Maximum 2 mm play in any direction

Spring Sag Limit: Maximum 5 mm deviation from original ride height

Operational Limits

Maximum Load Front: 1200 kg

Maximum Load Rear: 1100 kg

Maximum Speed For Suspension integrity: 250 km/h

Service Information Service

Detailed service requirements and schedules for the suspension system

10,000 miles

12 months

Inspect shock absorbers for leaks and damage
Check bushings for wear and play
Verify ride height and alignment

Replace worn components immediately to avoid further damage

50,000 miles

60 months

Replace shock absorbers if necessary
Inspect and replace anti-roll bar bushings if worn
Check and tighten all suspension bolts to specified torque

Use only Audi-approved parts for replacements

100,000 miles

120 months

Replace all suspension bushings
Inspect and replace coil springs if sagging
Perform full suspension alignment

Ensure all components are within manufacturer specifications

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system does the 2005-2008 Audi RS4 use?

The 2005-2008 Audi RS4 features a Dynamic Ride Control (DRC) suspension system. This system uses a hydraulic damping system interconnected between the front and rear axles to reduce body roll and improve handling. The front suspension is a double-wishbone setup, while the rear uses a trapezoidal-link design.

What is the ride height of the 2005-2008 Audi RS4?

The factory ride height of the 2005-2008 Audi RS4 is approximately 140 mm (5.5 inches) at the front and 135 mm (5.3 inches) at the rear. These measurements are taken from the ground to the wheel arch and may vary slightly depending on tire size and wear.

Can the DRC suspension be replaced with aftermarket alternatives?

Yes, the DRC suspension can be replaced with aftermarket coilover systems or other suspension setups. However, this may void the vehicle's warranty and should only be done by a qualified technician. Aftermarket systems may alter ride quality, handling, and safety, so it is crucial to choose components that meet Audi's engineering standards.

What is the recommended torque specification for suspension components?

The torque specifications for key suspension components are as follows: front upper control arm bolts (90 Nm + 90°), front lower control arm bolts (120 Nm + 90°), rear upper control arm bolts (70 Nm + 90°), and rear lower control arm bolts (100 Nm + 90°). Always refer to the official service manual for precise values and tightening sequences.

How often should the DRC suspension system be inspected?

The DRC suspension system should be inspected every 20,000 miles or annually, whichever comes first. Look for signs of hydraulic fluid leaks, worn bushings, or damaged dampers. Regular inspections are critical to maintaining optimal performance and safety.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi RS4 DRC Suspension Service Manual

Coming Soon

Official service manual detailing the maintenance and repair procedures for the DRC suspension system.

Audi RS4 Suspension Torque Specifications

Coming Soon

Comprehensive guide to torque values for all suspension components, ensuring proper installation and safety.

Audi RS4 Suspension Upgrade Options

Coming Soon

Overview of aftermarket suspension systems compatible with the 2005-2008 Audi RS4, including performance and handling considerations.

Audi RS4 Suspension Inspection Checklist

Coming Soon

Step-by-step checklist for inspecting the DRC suspension system, including common issues and troubleshooting tips.

About the Author

Expert automotive knowledge and experience

ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact

15+ Years

Experience

500+ Guides

Guides

50+ Makes

Vehicles

1000+ Solutions

Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

ASE Master Technician Certification
Advanced Diagnostic Specialist
Hybrid/Electric Vehicle Systems
Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information

The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.

Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
Always follow the manufacturer's recommended procedures and safety precautions.
Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
If you're unsure about any procedure, consult a qualified professional mechanic.

Intellectual Property

All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.