Audi Audi Q8 2018-present Suspension Bolt Torque Specifications
This page provides detailed torque specifications for all suspension bolts on the 2018-Present Audi Q8 (4M generation). 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 various components of the front suspension system, including control arms, struts, sway bar links, and steering components. These values are critical for maintaining proper suspension geometry, handling, and safety.
1 Upper Control Arm to Frame Bolts (Front)
M12 x 1.5
Upper Control Arm to Frame Bolts (Front)
M12 x 1.5Important Notes
2 Upper Control Arm to Steering Knuckle Bolt (Front)
M12 x 1.5
Upper Control Arm to Steering Knuckle Bolt (Front)
M12 x 1.5Important Notes
3 Lower Control Arm to Frame Bolts (Front)
M14 x 1.5
Lower Control Arm to Frame Bolts (Front)
M14 x 1.5Important Notes
4 Lower Control Arm to Steering Knuckle Bolt (Front)
M14 x 1.5
Lower Control Arm to Steering Knuckle Bolt (Front)
M14 x 1.5Important Notes
5 Sway Bar Link to Strut Bolt (Front)
M10 x 1.25
Sway Bar Link to Strut Bolt (Front)
M10 x 1.25Important Notes
6 Sway Bar Link to Sway Bar Bolt (Front)
M8 x 1.25
Sway Bar Link to Sway Bar Bolt (Front)
M8 x 1.25Torque Value
Important Notes
7 Strut Assembly Upper Mount Bolts (Front)
M8 x 1.25
Strut Assembly Upper Mount Bolts (Front)
M8 x 1.25Torque Value
Important Notes
8 Strut to Steering Knuckle Bolts (Front)
M14 x 1.5
Strut to Steering Knuckle Bolts (Front)
M14 x 1.5Important Notes
9 Brake Caliper to Steering Knuckle Bolts (Front)
M14 x 1.5
Brake Caliper to Steering Knuckle Bolts (Front)
M14 x 1.5Torque 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 rear suspension components, including control arms, shocks, sway bar links and wheel carrier. These values are essential for rear suspension stability, handling, and safe operation.
1 Upper Control Arm to Frame Bolts (Rear)
M12 x 1.5
Upper Control Arm to Frame Bolts (Rear)
M12 x 1.5Important Notes
2 Upper Control Arm to Wheel Carrier Bolt (Rear)
M12 x 1.5
Upper Control Arm to Wheel Carrier Bolt (Rear)
M12 x 1.5Important Notes
3 Lower Control Arm to Frame Bolts (Rear)
M14 x 1.5
Lower Control Arm to Frame Bolts (Rear)
M14 x 1.5Important Notes
4 Lower Control Arm to Wheel Carrier Bolt (Rear)
M14 x 1.5
Lower Control Arm to Wheel Carrier Bolt (Rear)
M14 x 1.5Important Notes
5 Toe Link to Frame Bolt (Rear)
M12 x 1.5
Toe Link to Frame Bolt (Rear)
M12 x 1.5Important Notes
6 Toe Link to Wheel Carrier Bolt (Rear)
M12 x 1.5
Toe Link to Wheel Carrier Bolt (Rear)
M12 x 1.5Important Notes
7 Sway Bar Link to Control Arm Bolt (Rear)
M10 x 1.25
Sway Bar Link to Control Arm Bolt (Rear)
M10 x 1.25Important Notes
8 Sway Bar Link to Sway Bar Bolt (Rear)
M8 x 1.25
Sway Bar Link to Sway Bar Bolt (Rear)
M8 x 1.25Torque Value
Important Notes
9 Rear Shock Absorber Lower Mount Bolt (Rear)
M14 x 1.5
Rear Shock Absorber Lower Mount Bolt (Rear)
M14 x 1.5Important Notes
10 Rear Shock Absorber Upper Mount Bolts (Rear)
M8 x 1.25
Rear Shock Absorber Upper Mount Bolts (Rear)
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 are proper torque specifications important for suspension bolts?
Why are proper torque specifications important for suspension bolts?
Proper torque is critical for maintaining the integrity and performance of your Audi Q8's suspension. Under-torquing can lead to bolts loosening, resulting in component movement, noise, and potential failure. Over-torquing can stretch or break bolts, damage threads, and compromise the strength of the connection, also leading to premature failure. Correct torque ensures optimal clamping force and prevents both issues, leading to safe, reliable handling.
Q2 Can I reuse suspension bolts on my Audi Q8?
Can I reuse suspension bolts on my Audi Q8?
Generally, it's best practice to replace certain suspension bolts, particularly those that are stretch bolts (also called torque-to-yield bolts), whenever they are loosened. These bolts are designed to stretch when tightened, and they can’t be relied upon to provide consistent clamping force after being used once. Refer to the specific repair manual for your Audi Q8 to identify which bolts require replacement. For example, the lower control arm bolts are typically recommended to be replaced after removal.
Q3 What if I don't have a torque wrench?
What if I don't have a torque wrench?
Using a torque wrench is essential for accurately tightening suspension bolts. Avoid guessing or using other methods. An inaccurately tightened bolt risks both undertightening or overtightening leading to potential failure. If you don't own a torque wrench, you can rent one from most auto parts stores, or seek assistance from a professional mechanic.
Q4 Where can I find the specific torque specifications for my Audi Q8's suspension?
Where can I find the specific torque specifications for my Audi Q8's suspension?
The most accurate source for torque specifications is your Audi Q8's official repair manual, which might be part of the official maintenance manual, or a separate document for mechanics. You may also find these specifications in reputable online databases catering to automotive maintenance. Never rely solely on generic specifications, as slight variances can exist between model years and trim levels. For example, a sport suspension might have different torque values compared to a standard one.
Q5 What should I do if a bolt feels like it is stripping during tightening?
What should I do if a bolt feels like it is stripping during tightening?
If you feel resistance beyond the normal tightening process or the bolt is becoming noticeably easier to turn despite reaching correct torque (or before), stop immediately. Forcing it may strip the threads or damage the bolt. Inspect the bolt and the threaded hole for damage and seek professional help for thread repair. Do not attempt to reuse a stripped bolt.
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 inch drive)
A calibrated torque wrench capable of measuring torque within the required range for suspension components.
- Accurate torque settings
- Audible click indicating torque achievement
Socket Set (Metric)
A comprehensive set of metric sockets in various sizes, including deep sockets for recessed bolts.
- Durable construction
- Variety of sizes including 13mm, 16mm, 18mm, 21mm, 22mm
Extension Bars
Various lengths of extension bars to reach bolts in tight spaces.
- Durable construction
- Multiple lengths for different access needs
Breaker Bar
A long, sturdy bar to initially loosen stubborn bolts.
- High-torque application
- Durable construction
Ball Joint Separator
A specialized tool to separate ball joints without damage.
- Durable construction
- Various types available for different joint configurations
Service Procedures
Front Suspension Strut Bolt Torque Procedure
Procedure for torquing the bolts securing the front strut to the steering knuckle and body.
- Loosen all strut bolts.
- Position the strut correctly and start all bolts by hand.
- Torque the upper strut mount bolts to 60 Nm + 90 degrees.
- Torque the lower strut bolts to the steering knuckle to 100 Nm + 90 degrees.
- Double check all torque settings.
Rear Suspension Lower Control Arm Bolt Torque Procedure
Procedure for torquing the bolts securing the rear lower control arms to the body and hub carrier.
- Loosen all lower control arm bolts.
- Position the control arm correctly and start all bolts by hand.
- Torque the control arm to body bolts to 120 Nm + 90 degrees.
- Torque the control arm to hub carrier bolts to 100 Nm + 90 degrees.
- Double check all torque settings.
Rear Suspension Upper Control Arm Bolt Torque Procedure
Procedure for torquing the bolts securing the rear upper control arms to the body and hub carrier.
- Loosen all upper control arm bolts.
- Position the control arm correctly and start all bolts by hand.
- Torque the control arm to body bolts to 70 Nm + 90 degrees.
- Torque the control arm to hub carrier bolts to 80 Nm + 90 degrees.
- Double check all torque settings.
Sway Bar Link Torque Procedure
Procedure for torquing the bolts securing the front and rear sway bar links.
- Loosen all sway bar link bolts.
- Position the link correctly and start all bolts by hand.
- Torque front sway bar link bolts to 40 Nm.
- Torque rear sway bar link bolts to 40 Nm.
- Double check all torque settings.
Technical Service Bulletins
Potential for Rear Suspension Bolt Loosening
2020-05-15Some 2018-2019 Q8 models may experience rear suspension bolt loosening over time. This is due to improper factory torque application and environmental conditions.
Resolution: Inspect all rear suspension bolts, specifically the lower control arm bolts. Torque to the specifications outlined in the service manual and use new bolts where necessary.
Front Strut Bolt Torque Specification Clarification
2021-11-20Clarification on the torque and angle tightening sequence for front suspension strut bolts. Provides specific torque values and tightening sequence.
Resolution: Follow the revised torque specification of 100 Nm + 90 degrees for the lower strut to steering knuckle bolts. Upper strut mount bolts are torqued to 60 Nm + 90 degrees. Always use a calibrated torque wrench.
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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.
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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.