Audi Audi S5 2007-2016 Suspension Bolt Torque Specifications
Detailed torque specifications for all suspension bolts on the 2007-2016 Audi S5 (B8/8T) 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 front suspension components of a 2007-2016 Audi S5, including control arms, struts, sway bar, and subframe.
1 Upper Control Arm to Frame Bolts (inner)
M12 x 1.5
Upper Control Arm to Frame Bolts (inner)
M12 x 1.5Torque Value
Important Notes
2 Upper Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5
Upper Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5Important Notes
3 Lower Control Arm to Frame Bolts (inner)
M12 x 1.5
Lower Control Arm to Frame Bolts (inner)
M12 x 1.5Important Notes
4 Lower Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5
Lower Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5Important Notes
5 Sway Bar End Link to Strut Bolt
M10 x 1.5
Sway Bar End Link to Strut Bolt
M10 x 1.5Torque Value
Important Notes
6 Sway Bar End Link to Sway Bar Bolt
M10 x 1.5
Sway Bar End Link to Sway Bar Bolt
M10 x 1.5Torque Value
Important Notes
7 Strut to Steering Knuckle Bolts (pinch bolt)
M14 x 1.5
Strut to Steering Knuckle Bolts (pinch bolt)
M14 x 1.5Important Notes
8 Strut Mount Bolts (top of strut)
M10 x 1.5
Strut Mount Bolts (top of strut)
M10 x 1.5Torque Value
Important Notes
9 Subframe to Chassis Bolts
M14 x 1.5
Subframe to Chassis Bolts
M14 x 1.5Important Notes
10 Wheel Speed Sensor Bolt
M6 x 1.0
Wheel Speed Sensor Bolt
M6 x 1.0Torque Value
Important Notes
Rear Suspension
Torque specifications for the rear suspension components of a 2007-2016 Audi S5, including control arms, struts, sway bar, and subframe.
1 Upper Control Arm to Frame Bolts (inner)
M12 x 1.5
Upper Control Arm to Frame Bolts (inner)
M12 x 1.5Important Notes
2 Upper Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5
Upper Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5Important Notes
3 Lower Control Arm to Frame Bolts (inner)
M12 x 1.5
Lower Control Arm to Frame Bolts (inner)
M12 x 1.5Important Notes
4 Lower Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5
Lower Control Arm to Steering Knuckle Bolt (outer)
M12 x 1.5Important Notes
5 Sway Bar End Link to Control Arm Bolt
M10 x 1.5
Sway Bar End Link to Control Arm Bolt
M10 x 1.5Torque Value
Important Notes
6 Sway Bar Mount Bracket Bolts
M10 x 1.5
Sway Bar Mount Bracket Bolts
M10 x 1.5Torque Value
Important Notes
7 Strut to Steering Knuckle Bolts (lower)
M12 x 1.5
Strut to Steering Knuckle Bolts (lower)
M12 x 1.5Important Notes
8 Strut Mount Bolts (top of strut)
M10 x 1.5
Strut Mount Bolts (top of strut)
M10 x 1.5Torque Value
Important Notes
9 Subframe to Chassis Bolts
M14 x 1.5
Subframe to Chassis Bolts
M14 x 1.5Important Notes
10 Wheel Speed Sensor Bolt
M6 x 1.0
Wheel Speed Sensor Bolt
M6 x 1.0Torque 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 important to use the correct torque specifications for suspension bolts?
Why is it important to use the correct torque specifications for suspension bolts?
Using the correct torque specifications is critical for suspension performance, safety, and longevity. Under-torquing can lead to bolts loosening, causing instability and potential component failure. Over-torquing can stretch or break bolts, damage threads, and compromise the integrity of the suspension system. This could result in poor handling, noise, and a dangerous driving situation.
Q2 What happens if I overtighten suspension bolts?
What happens if I overtighten suspension bolts?
Overtightening can damage the bolt itself, the threads in the receiving component (like the control arm or subframe), or both. This can cause the bolt to yield, become brittle, or even break. It may also cause the component to crack or distort. In a real-world scenario, overtorquing a lower control arm bolt could lead to premature bushing wear or even control arm failure, affecting alignment and potentially leading to an accident.
Q3 What happens if I undertighten suspension bolts?
What happens if I undertighten suspension bolts?
Undertightening suspension bolts means the clamping force between components isn't sufficient. This can allow for movement between parts, resulting in clunking noises, poor alignment, excessive wear, and eventually, the bolts could come loose entirely. Imagine a sway bar end link bolt being undertightened; it will rattle, affect the car’s stability in corners, and could eventually detach entirely.
Q4 Should I use new bolts when replacing suspension components?
Should I use new bolts when replacing suspension components?
Generally, it is highly recommended to use new bolts when replacing suspension components. Many suspension bolts are torque-to-yield (TTY), meaning they are designed to stretch slightly upon tightening. Reusing TTY bolts can result in inaccurate clamping force and may lead to failure. Using new bolts ensures proper clamping and a secure connection. It's worth the small cost to avoid a potential failure later.
Q5 Do I need to apply thread locker or lubricant to suspension bolts?
Do I need to apply thread locker or lubricant to suspension bolts?
Always refer to the manufacturer's specifications for your specific vehicle. Some suspension bolts require thread locker (like Loctite) to prevent loosening due to vibration. Others may require lubricant (like anti-seize) to ensure accurate torque readings. Using the wrong lubricant can affect torque values. Consult your service manual to be sure.
Q6 What is the difference between Nm and lb-ft when referring to torque?
What is the difference between Nm and lb-ft when referring to torque?
Nm (Newton-meters) and lb-ft (pound-feet) are units of torque. They are simply different scales used to measure the rotational force required to tighten a fastener. A conversion chart is readily available online if you need to convert between the two. Be sure you are using the correct unit when setting a torque wrench.
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 high-quality torque wrench is essential for accurate tightening of suspension bolts to the specified torque values.
- Wide torque range (e.g., 20-250 ft-lbs)
- Accurate calibration
- Click-type or digital display
Torque Wrench (3/8-inch Drive)
A 3/8 inch torque wrench is helpful for smaller fasteners.
- Lower torque range for smaller fasteners
- Accurate calibration
- Click-type or digital display
Socket Set (Metric)
A comprehensive set of metric sockets is required to fit the various bolt and nut sizes used in the S5's suspension system.
- Sizes ranging from 10mm to 24mm
- 6-point sockets for secure grip
- Deep and shallow sockets
Wrench Set (Metric)
A set of metric wrenches, ideally combination wrenches, is good for access in some areas.
- Sizes ranging from 10mm to 24mm
- Box end and open end
Breaker Bar (1/2-inch Drive)
A breaker bar can be used to initially loosen stubborn bolts.
- Long handle for increased leverage
- Heavy-duty construction
Jack Stands
Essential for safely supporting the vehicle when working underneath.
- Rated for the weight of the vehicle
- Adjustable height
- Wide base for stability
Vehicle Jack
Used to lift the vehicle to access suspension components.
- Rated for the weight of the vehicle
- Hydraulic or mechanical operation
Service Procedures
Front Suspension Control Arm Bolt Replacement
Detailed procedure for removing and reinstalling the control arms in the front suspension, including correct torque specs.
- Loosen wheel lug bolts and raise the vehicle using the jack.
- Support the vehicle with jack stands under appropriate points.
- Remove the wheel.
- Identify and loosen the control arm bolt(s) using a breaker bar if needed.
- Remove the bolt(s).
- Install the new control arm and insert the bolt(s).
- Tighten the control arm bolt(s) to the specified torque specification using the torque wrench.
- Reinstall the wheel and tighten lug bolts to the correct specification.
- Lower the vehicle and torque lug bolts to final specification.
Rear Suspension Control Arm Bolt Replacement
Detailed procedure for removing and reinstalling the control arms in the rear suspension, including correct torque specs.
- Loosen wheel lug bolts and raise the vehicle using the jack.
- Support the vehicle with jack stands under appropriate points.
- Remove the wheel.
- Identify and loosen the control arm bolt(s) using a breaker bar if needed.
- Remove the bolt(s).
- Install the new control arm and insert the bolt(s).
- Tighten the control arm bolt(s) to the specified torque specification using the torque wrench.
- Reinstall the wheel and tighten lug bolts to the correct specification.
- Lower the vehicle and torque lug bolts to final specification.
Sway Bar Link Replacement
Procedure to replace the sway bar links and correctly torque the fasteners.
- Loosen wheel lug bolts and raise the vehicle using the jack.
- Support the vehicle with jack stands under appropriate points.
- Remove the wheel.
- Identify and loosen the sway bar link bolt(s) using a breaker bar if needed.
- Remove the bolt(s) and the sway bar link.
- Install the new sway bar link and insert the bolt(s).
- Tighten the sway bar link bolt(s) to the specified torque specification using the torque wrench.
- Reinstall the wheel and tighten lug bolts to the correct specification.
- Lower the vehicle and torque lug bolts to final specification.
Strut/Shock Absorber Replacement
Procedure for replacing the strut/shock assembly. Including proper tightening of all bolts and nuts.
- Loosen wheel lug bolts and raise the vehicle using the jack.
- Support the vehicle with jack stands under appropriate points.
- Remove the wheel.
- Identify and loosen the strut/shock bolts using a breaker bar if needed.
- Remove the strut/shock assembly.
- Install the new strut/shock and insert the bolts/nuts.
- Tighten the strut/shock bolts/nuts to the specified torque specification using the torque wrench.
- Reinstall the wheel and tighten lug bolts to the correct specification.
- Lower the vehicle and torque lug bolts to final specification.
Technical Service Bulletins
Suspension Noise on Rough Roads
2012-05-15Technical bulletin addressing a clunking noise originating from the front suspension over rough roads. Often caused by incorrect torque on control arm bolts after service.
Resolution: Re-torque all front suspension control arm bolts to the specified torque. Inspect for damage, replace if necessary.
Premature Wear of Rear Suspension Components
2014-11-20Technical bulletin regarding premature wear of rear suspension bushings. This can be exacerbated by improper torque on securing fasteners.
Resolution: Inspect the rear suspension components for wear. Ensure all bolts are torqued to specification after any service.
Steering Wheel Vibration After Suspension Work
2016-02-01Technical bulletin indicating that steering wheel vibration can be caused by improper tightening of the strut/shock bolts after replacing suspension components.
Resolution: Verify proper torque of the strut/shock absorber bolts. Ensure that all related fasteners have been tightened in the proper sequence and to the correct specification.
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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.