Audi Audi A8 2010-2017 Suspension Bolt Torque Specifications
This page provides detailed torque specifications for all suspension bolts on the 2010-2017 Audi A8 (D4/4H) chassis. Includes front and rear 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 the various components of the front suspension system, including control arms, struts, and related hardware.
1 Upper Control Arm to Chassis (Front)
M12 x 1.5
Upper Control Arm to Chassis (Front)
M12 x 1.5Important Notes
2 Upper Control Arm to Spindle (Front)
M10 x 1.25
Upper Control Arm to Spindle (Front)
M10 x 1.25Important Notes
3 Lower Control Arm to Chassis (Front)
M14 x 1.5
Lower Control Arm to Chassis (Front)
M14 x 1.5Important Notes
4 Lower Control Arm to Spindle (Front)
M14 x 1.5
Lower Control Arm to Spindle (Front)
M14 x 1.5Important Notes
5 Sway Bar Link to Sway Bar (Front)
M10 x 1.5
Sway Bar Link to Sway Bar (Front)
M10 x 1.5Torque Value
Important Notes
6 Sway Bar Link to Strut (Front)
M10 x 1.5
Sway Bar Link to Strut (Front)
M10 x 1.5Torque Value
Important Notes
7 Strut Upper Mount to Body (Front)
M8 x 1.25
Strut Upper Mount to Body (Front)
M8 x 1.25Torque Value
Important Notes
8 Strut to Spindle/Knuckle (Front)
M14 x 1.5
Strut to Spindle/Knuckle (Front)
M14 x 1.5Important Notes
9 Brake Caliper to Spindle (Front)
M12 x 1.75
Brake Caliper to Spindle (Front)
M12 x 1.75Torque Value
Important Notes
10 Wheel Speed Sensor Bolt (Front)
M6 x 1.0
Wheel Speed Sensor Bolt (Front)
M6 x 1.0Torque Value
Important Notes
Rear Suspension
Torque specifications for components of the rear suspension system, including control arms, struts, and related hardware.
1 Upper Control Arm to Chassis (Rear)
M12 x 1.5
Upper Control Arm to Chassis (Rear)
M12 x 1.5Important Notes
2 Upper Control Arm to Spindle/Hub Carrier (Rear)
M10 x 1.25
Upper Control Arm to Spindle/Hub Carrier (Rear)
M10 x 1.25Important Notes
3 Lower Control Arm to Chassis (Rear)
M14 x 1.5
Lower Control Arm to Chassis (Rear)
M14 x 1.5Important Notes
4 Lower Control Arm to Spindle/Hub Carrier (Rear)
M14 x 1.5
Lower Control Arm to Spindle/Hub Carrier (Rear)
M14 x 1.5Important Notes
5 Toe Link to Chassis (Rear)
M12 x 1.5
Toe Link to Chassis (Rear)
M12 x 1.5Important Notes
6 Toe Link to Spindle/Hub Carrier (Rear)
M12 x 1.5
Toe Link to Spindle/Hub Carrier (Rear)
M12 x 1.5Important Notes
7 Sway Bar Link to Sway Bar (Rear)
M10 x 1.5
Sway Bar Link to Sway Bar (Rear)
M10 x 1.5Torque Value
Important Notes
8 Sway Bar Link to Control Arm (Rear)
M10 x 1.5
Sway Bar Link to Control Arm (Rear)
M10 x 1.5Torque Value
Important Notes
9 Strut Upper Mount to Body (Rear)
M8 x 1.25
Strut Upper Mount to Body (Rear)
M8 x 1.25Torque Value
Important Notes
10 Strut to Spindle/Hub Carrier (Rear)
M14 x 1.5
Strut to Spindle/Hub Carrier (Rear)
M14 x 1.5Important 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 are correct torque specifications important for suspension bolts?
Why are correct torque specifications important for suspension bolts?
Proper torque is crucial for ensuring the structural integrity and safety of your Audi A8's suspension system. Under-torqued bolts can loosen over time, leading to component failure, instability, and even accidents. Over-torqued bolts can stretch or break, damaging threads and weakening the joint. Correct torque ensures proper clamping force, maintaining the designed geometry and performance of the suspension.
Q2 What happens if I don't have a torque wrench?
What happens if I don't have a torque wrench?
While it's possible to tighten bolts without a torque wrench, it's highly discouraged for suspension components. Guessing the torque can lead to the issues mentioned above (under or over-tightening). It’s best to rent or borrow a torque wrench. Additionally, it's highly recommended to use a calibrated torque wrench to ensure accurate readings.
Q3 Should I use threadlocker on suspension bolts?
Should I use threadlocker on suspension bolts?
Generally, threadlocker (like Loctite) is not required on most Audi A8 suspension bolts. However, some specific applications may recommend it. Consult the factory repair manual for your model year and VIN. If threadlocker is specified, always use the correct type (e.g., medium strength for general use). Also, ensure all bolts are clean before application. For reusable bolts with thread locker, a wire brush is a great option to remove the old product.
Q4 Do torque specs change based on the bolt's material?
Do torque specs change based on the bolt's material?
Yes, the material and grade of the bolt significantly influence torque specifications. Suspension bolts are typically high-strength steel, and using a torque spec meant for a lower-grade bolt can lead to over-torquing and failure. Always refer to the torque specs specific to your Audi A8 and confirm that the bolt is the correct one.
Q5 Are suspension bolts single-use only?
Are suspension bolts single-use only?
Some suspension bolts are designed for single-use and should always be replaced after being removed. This is common with torque-to-yield bolts (TTY), which stretch when tightened and cannot be reused. Refer to your Audi A8’s service manual to confirm whether a bolt is single use or reusable. Failure to replace single-use bolts can compromise the suspension system's integrity. If your manual specifies single-use replacement, always follow the manufacturers recommendation.
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 precision instrument for applying specific torque values to fasteners.
- Accurate torque measurement
- Ratchet mechanism for efficient tightening
- Click-type or digital display
Torque Wrench (3/8" Drive)
A smaller precision instrument for applying specific torque values to smaller fasteners.
- Accurate torque measurement
- Ratchet mechanism for efficient tightening
- Click-type or digital display
Socket Set (Metric)
A collection of sockets in various metric sizes to fit different bolts and nuts.
- Wide range of sizes
- Durable construction
- Standard and deep sockets
Extension Bars
Used to extend the reach of the torque wrench to access recessed or hard-to-reach fasteners.
- Various lengths
- Durable construction
- Secure connection
Universal Joint
Allows sockets to be used at an angle for fasteners in difficult locations.
- Flexible range of motion
- Durable construction
- Secure connection
Service Procedures
Front Upper Control Arm Bolt Torque Procedure
This procedure outlines how to properly torque the bolts for the front upper control arms.
- Locate the upper control arm bolts.
- Using the correct sized socket, initially tighten the bolts to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolts to the specified torque value (typically around 70 Nm + 90 degrees).
- Double check the torque with your torque wrench to ensure the correct value.
Front Lower Control Arm Bolt Torque Procedure
This procedure outlines how to properly torque the bolts for the front lower control arms.
- Locate the lower control arm bolts.
- Using the correct sized socket, initially tighten the bolts to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolts to the specified torque value (typically around 100 Nm + 90 degrees).
- Double check the torque with your torque wrench to ensure the correct value.
Rear Upper Control Arm Bolt Torque Procedure
This procedure outlines how to properly torque the bolts for the rear upper control arms.
- Locate the rear upper control arm bolts.
- Using the correct sized socket, initially tighten the bolts to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolts to the specified torque value (typically around 70 Nm + 90 degrees).
- Double check the torque with your torque wrench to ensure the correct value.
Rear Lower Control Arm Bolt Torque Procedure
This procedure outlines how to properly torque the bolts for the rear lower control arms.
- Locate the rear lower control arm bolts.
- Using the correct sized socket, initially tighten the bolts to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolts to the specified torque value (typically around 100 Nm + 90 degrees).
- Double check the torque with your torque wrench to ensure the correct value.
Sway Bar End Link Bolt Torque Procedure
This procedure outlines how to properly torque the bolts for the sway bar end links.
- Locate the sway bar end link bolts.
- Using the correct sized socket, initially tighten the bolts to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolts to the specified torque value (typically around 50 Nm).
- Double check the torque with your torque wrench to ensure the correct value.
Strut/Shock Absorber Lower Mounting Bolt Torque Procedure
This procedure outlines how to properly torque the lower mounting bolt for the strut or shock absorber.
- Locate the lower strut/shock absorber mounting bolt.
- Using the correct sized socket, initially tighten the bolt to a snug fit.
- Using the correct sized socket and torque wrench, tighten the bolt to the specified torque value (typically around 100 Nm + 90 degrees).
- Double check the torque with your torque wrench to ensure the correct value.
Technical Service Bulletins
Suspension Noise After Repair
2014-05-15Some A8 models may experience creaking or knocking noises after suspension work if bolts are not torqued correctly or in the correct order.
Resolution: Ensure all bolts are tightened to manufacturer specified torque values and in the recommended order. Replace any bolts that have been stretched or damaged during installation. Ensure the suspension is loaded before final torque.
Premature Wear on Control Arm Bushings
2016-11-20Incorrect torque of control arm bolts can lead to premature wear of the bushings and associated play in the suspension.
Resolution: Inspect bushings for wear. If worn, replace along with correct torque to all related bolts and nuts as per repair manual. Ensure the suspension is loaded before final torque.
Alignment Issues After Suspension Work
2017-02-10Failure to correctly torque suspension components can cause alignment problems and unusual tire wear.
Resolution: Always torque suspension components to the proper manufacturer specifications. Check and correct alignment immediately following any suspension component replacement or removal.
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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.