Audi Audi S8 2019-present Suspension Bolt Torque Specifications
Comprehensive guide to suspension bolt torque specifications for the 2019-Present Audi S8 (D5 generation). Includes torque values for various suspension components.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Front Suspension
Torque specifications for components of the front suspension system, including control arms, steering knuckles, and shock absorbers.
1 Upper Control Arm to Body Bolt
M14 x 1.5
Upper Control Arm to Body Bolt
M14 x 1.5Important Notes
2 Upper Control Arm to Steering Knuckle Bolt
M12 x 1.5
Upper Control Arm to Steering Knuckle Bolt
M12 x 1.5Important Notes
3 Lower Control Arm to Body Bolt
M16 x 1.5
Lower Control Arm to Body Bolt
M16 x 1.5Important Notes
4 Lower Control Arm to Steering Knuckle Bolt
M14 x 1.5
Lower Control Arm to Steering Knuckle Bolt
M14 x 1.5Important Notes
5 Shock Absorber/Strut to Steering Knuckle Bolt(s)
M14 x 1.5
Shock Absorber/Strut to Steering Knuckle Bolt(s)
M14 x 1.5Important Notes
6 Anti-Roll Bar (Sway Bar) Link to Strut Bolt
M12 x 1.75
Anti-Roll Bar (Sway Bar) Link to Strut Bolt
M12 x 1.75Torque Value
Important Notes
7 Anti-Roll Bar (Sway Bar) Link to Sway Bar Bolt
M12 x 1.75
Anti-Roll Bar (Sway Bar) Link to Sway Bar Bolt
M12 x 1.75Torque Value
Important Notes
8 Upper Shock Mount to Body Bolts
M10 x 1.5
Upper Shock Mount to Body Bolts
M10 x 1.5Torque Value
Important Notes
9 Brake Caliper to Steering Knuckle Bolts
M16 x 1.5
Brake Caliper to Steering Knuckle Bolts
M16 x 1.5Torque Value
Important Notes
10 Brake Disc to Wheel Hub Bolt
M8 x 1.25
Brake Disc to Wheel Hub Bolt
M8 x 1.25Torque Value
Important Notes
Rear Suspension
Torque specifications for components of the rear suspension system, including control arms, wheel carriers, and shock absorbers.
1 Upper Control Arm to Body Bolt
M14 x 1.5
Upper Control Arm to Body Bolt
M14 x 1.5Important Notes
2 Upper Control Arm to Wheel Carrier Bolt
M12 x 1.5
Upper Control Arm to Wheel Carrier Bolt
M12 x 1.5Important Notes
3 Lower Control Arm to Body Bolt
M16 x 1.5
Lower Control Arm to Body Bolt
M16 x 1.5Important Notes
4 Lower Control Arm to Wheel Carrier Bolt
M14 x 1.5
Lower Control Arm to Wheel Carrier Bolt
M14 x 1.5Important Notes
5 Shock Absorber to Wheel Carrier Bolt(s)
M14 x 1.5
Shock Absorber to Wheel Carrier Bolt(s)
M14 x 1.5Important Notes
6 Anti-Roll Bar (Sway Bar) Link to Strut Bolt
M12 x 1.75
Anti-Roll Bar (Sway Bar) Link to Strut Bolt
M12 x 1.75Torque Value
Important Notes
7 Anti-Roll Bar (Sway Bar) Link to Sway Bar Bolt
M12 x 1.75
Anti-Roll Bar (Sway Bar) Link to Sway Bar Bolt
M12 x 1.75Torque Value
Important Notes
8 Upper Shock Mount to Body Bolts
M10 x 1.5
Upper Shock Mount to Body Bolts
M10 x 1.5Torque Value
Important Notes
9 Rear Brake Caliper to Wheel Carrier Bolts
M14 x 1.5
Rear Brake Caliper to Wheel Carrier Bolts
M14 x 1.5Torque Value
Important Notes
10 Brake Disc to Wheel Hub Bolt
M8 x 1.25
Brake Disc to Wheel Hub Bolt
M8 x 1.25Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Why is it crucial to use the correct torque specifications for suspension bolts?
Why is it crucial to use the correct torque specifications for suspension bolts?
Using the correct torque is critical to ensure proper clamping force. Under-torquing can lead to bolts loosening, causing component shifting, noises, and potential failure. Over-torquing can stretch or break bolts, damage threads, and also lead to component failure and dangerous driving conditions. Proper torque ensures the suspension performs as designed by Audi, maintaining optimal handling and safety.
Q2 Do I need to use new bolts when working on the suspension?
Do I need to use new bolts when working on the suspension?
It's generally recommended to replace one-time use torque-to-yield (TTY) bolts whenever they are loosened or removed. These bolts are designed to stretch upon tightening, and re-using them can lead to unreliable clamping force. Consult your service manual to identify which bolts are TTY. Even non-TTY bolts may have torque limits, and replacing old, corroded bolts is best practice. Always follow your manual for recommended replacement procedures.
Q3 What type of lubricant should I use on suspension bolts?
What type of lubricant should I use on suspension bolts?
Unless the service manual specifically states otherwise, no lubricant should be applied to the bolt threads. When lubricant is used, torque values change significantly, resulting in unpredictable clamping forces. Clean threads and good condition bolts are important for proper tightening. If any specific lubricant is needed it will be called out in the manual.
Q4 How often should I check the torque on my suspension bolts?
How often should I check the torque on my suspension bolts?
Generally, suspension bolts do not require periodic torque checks if they were correctly torqued and are not TTY bolts. However, it's advisable to check torque after initial work and after several hundred miles following new repairs. If you regularly drive on rough roads or track your vehicle, a more frequent inspection may be prudent. Unusual noises, changes in handling, or looseness should trigger an immediate check of your suspension components, including bolts.
Q5 What should I do if I suspect a suspension bolt is loose?
What should I do if I suspect a suspension bolt is loose?
If you suspect a loose suspension bolt (due to noise, handling change, or visual inspection), stop driving the vehicle immediately if it is safe to do so. Loose suspension components can cause dangerous instability. Inspect all fasteners and have the vehicle towed for repair by a trained technician. Driving with a loose suspension component can cause damage to other components, and even complete suspension failure.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench (1/2" Drive)
A calibrated torque wrench is essential for accurate tightening of suspension bolts to specified torque values. A 1/2" drive is suitable for the range of torque needed.
- Click-type mechanism
- Torque range of 20-200 Nm
- Accurate calibration
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque values often used in suspension components.
- Click-type mechanism
- Torque range of 5-60 Nm
- Accurate calibration
Socket Set (Metric)
A comprehensive set of metric sockets, including sizes commonly used on Audi suspension components. Deep sockets and extensions are useful.
- Sizes 10mm-24mm
- Both shallow and deep sockets
- Various extensions and adapters
Hex/Allen Key Set (Metric)
Metric hex keys for fasteners used in some suspension connections and components.
- Sizes 4mm-12mm
- Long-arm and short-arm options
- Durable construction
Jack and Jack Stands
Heavy-duty jack and jack stands are needed to safely lift the vehicle and support it during work.
- Appropriate lifting capacity for the vehicle
- Stable and secure jack stands
- Compliant with safety standards
Service Procedures
Front Lower Control Arm Bolt Torque
Procedure for torquing the bolts securing the front lower control arms to the subframe and wheel carrier. This includes both the inner and outer bolts.
- Raise and support the vehicle safely using a jack and jack stands.
- Locate the front lower control arm bolts.
- Using the appropriate socket, tighten the inner bolts to 100 Nm + 90 degrees.
- Tighten the outer bolts to 70 Nm + 90 degrees.
- Lower vehicle and perform final tightening while suspension is under normal load.
Rear Upper Control Arm Bolt Torque
Procedure for torquing the bolts securing the rear upper control arms to the chassis and wheel carrier.
- Raise and support the vehicle safely using a jack and jack stands.
- Locate the rear upper control arm bolts.
- Using the appropriate socket, tighten the bolts to 70 Nm + 90 degrees.
- Lower vehicle and perform final tightening while suspension is under normal load.
Front Strut Lower Bolt Torque
Procedure for torquing the lower bolt connecting the front strut to the wheel carrier.
- Raise and support the vehicle safely using a jack and jack stands.
- Locate the front strut lower bolt.
- Using the appropriate socket and torque wrench, tighten the bolt to 120 Nm + 180 degrees.
- Lower vehicle and perform final tightening while suspension is under normal load.
Rear Shock Absorber Lower Bolt Torque
Procedure for torquing the lower bolt connecting the rear shock absorber to the wheel carrier
- Raise and support the vehicle safely using a jack and jack stands.
- Locate the rear shock absorber lower bolt.
- Using the appropriate socket and torque wrench, tighten the bolt to 100 Nm + 90 degrees
- Lower vehicle and perform final tightening while suspension is under normal load.
Technical Service Bulletins
Suspension Noise After Wheel Alignment
2020-05-15Some 2019-2020 S8 models may exhibit a creaking noise from the front suspension after a wheel alignment due to improper torque on the lower control arm bolts.
Resolution: Loosen and re-torque all front lower control arm bolts to the correct specifications as outlined in the service manual. Ensure all bolts are tightened while the vehicle is under normal load.
Rear Suspension Binding Issue
2021-11-20A small number of 2021 S8 models may experience binding in the rear suspension due to improperly torqued upper control arm bolts.
Resolution: Inspect and ensure the rear upper control arm bolts are torqued to 70 Nm + 90 degrees as specified in the service manual. Ensure bolts are tightened while the vehicle is under normal load.
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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.