Audi Audi A5 2016-present Suspension Bolt Torque Specifications
Comprehensive guide to the suspension bolt torque specifications for the 2016-Present Audi A5 (B9) platform. 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
This subsystem includes components that make up the front suspension system, such as control arms, ball joints, and tie rod ends.
1 Control Arm Bolts
M14 x 1.5
Control Arm Bolts
M14 x 1.5Torque Value
Important Notes
2 Ball Joint Nut
M16 x 1.5
Ball Joint Nut
M16 x 1.5Torque Value
Important Notes
3 Tie Rod End Nut
M12 x 1.25
Tie Rod End Nut
M12 x 1.25Torque Value
Important Notes
Rear suspension
This subsystem includes components that make up the rear suspension system, such as control arms, coil springs, and sway bar links.
1 Upper Control Arm Bushing Bolts
M10 x 1.25
Upper Control Arm Bushing Bolts
M10 x 1.25Torque Value
Important Notes
2 Lower Control Arm Bolts
M14 x 1.5
Lower Control Arm Bolts
M14 x 1.5Torque Value
Important Notes
3 Coil Spring Mounting Bolts
M12 x 1.25
Coil Spring Mounting Bolts
M12 x 1.25Torque Value
Important Notes
Steering system
This subsystem includes components that make up the steering system, such as the steering gear and tie rod ends.
1 Steering Gear Mounting Bolts
M14 x 1.5
Steering Gear Mounting Bolts
M14 x 1.5Torque Value
Important Notes
Strut/shock absorber
This subsystem includes components that make up the strut/shock absorber system, such as the strut/shock absorber mounting bolts.
1 Strut/Shock Absorber Mounting Bolts
M12 x 1.25
Strut/Shock Absorber Mounting Bolts
M12 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 torque specifications so important for suspension bolts?
Why are torque specifications so important for suspension bolts?
Proper torque is crucial for suspension bolt integrity. Under-tightening can lead to loosening, causing instability and potential component failure, while over-tightening can stretch or break bolts, compromising suspension performance and safety. Correct torque ensures secure fastening, proper preload on bearings, and optimal component function.
Q2 What happens if I don't use a torque wrench?
What happens if I don't use a torque wrench?
Using a torque wrench is highly recommended to achieve accurate torque. 'By feel' methods are often inconsistent. Over-tightening is a common issue with hand tools, potentially damaging the bolt or mating components, while under-tightening could lead to bolt loosening and failure over time. A torque wrench provides controlled, repeatable results.
Q3 Should I replace suspension bolts every time I remove them?
Should I replace suspension bolts every time I remove them?
It's best practice to replace 'torque-to-yield' bolts (TTY), also known as stretch bolts, each time they are removed. These bolts are designed to stretch when tightened, ensuring a precise clamping force. Reusing them can result in incorrect torque and potential component failure. Some non-TTY bolts may be reused if they're in good condition, but check the manufacturer's service manual for confirmation.
Q4 What is 'torque-to-yield' and how does it differ from regular bolts?
What is 'torque-to-yield' and how does it differ from regular bolts?
Torque-to-yield (TTY) bolts are designed to stretch beyond their elastic limit when tightened, creating a strong clamping force. They are often tightened first to a specific torque value, and then by a specific angle of rotation. Regular bolts don't stretch this far. TTY bolts should always be replaced after each removal as they cannot maintain their initial clamping force once stretched.
Q5 Can I use an impact wrench to tighten suspension bolts?
Can I use an impact wrench to tighten suspension bolts?
Using an impact wrench to tighten suspension bolts is generally not recommended, especially for final torque application. While impact wrenches can be useful for initial tightening, they lack the fine control needed for precise torque. Overtightening and damaging threads is a common problem. Always use a calibrated torque wrench for final tightening to the manufacturer's specifications.
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 tightening suspension bolts to the manufacturer's specified torque. A 1/2" drive is suitable for most suspension components.
- Calibrated for accurate torque application
- 1/2" drive for common socket sizes
Torque Wrench (3/8" Drive)
A 3/8" drive torque wrench can be useful for the smaller fasteners on the suspension system.
- Calibrated for accurate torque application
- 3/8" drive for smaller socket sizes
Socket Set (Metric)
A comprehensive set of metric sockets, including standard and deep sockets, will be needed for various suspension bolt sizes.
- Metric sizes
- Standard and deep socket options
Wrench Set (Metric)
A metric wrench set is useful for holding bolts on one end when applying torque or to loosen stubborn bolts.
- Metric sizes
- Open-end and box-end options
Ball Joint Separator
A ball joint separator is required to separate the ball joints from the control arms without damaging components.
- Specialized design to avoid damage
- Various sizes for different joints
Service Procedures
Front Lower Control Arm Bolt Torque Procedure
Detailed steps for tightening the lower control arm bolts to the chassis on a 2016-Present Audi A5.
- Loosen the wheel lugs and lift the vehicle.
- Remove the wheel.
- Locate the lower control arm bolts connecting to the chassis.
- Using a metric socket and a torque wrench, tighten the bolts to the manufacturer's specified torque. (Consult repair manual for specific value).
- Reinstall the wheel and lower the vehicle.
- Re-torque the wheel lugs.
Front Upper Control Arm Bolt Torque Procedure
Detailed steps for tightening the upper control arm bolts to the chassis on a 2016-Present Audi A5.
- Loosen the wheel lugs and lift the vehicle.
- Remove the wheel.
- Locate the upper control arm bolts connecting to the chassis.
- Using a metric socket and a torque wrench, tighten the bolts to the manufacturer's specified torque. (Consult repair manual for specific value).
- Reinstall the wheel and lower the vehicle.
- Re-torque the wheel lugs.
Front Sway Bar Link Bolt Torque Procedure
Detailed steps for tightening the sway bar link bolts on a 2016-Present Audi A5.
- Loosen the wheel lugs and lift the vehicle.
- Remove the wheel.
- Locate the sway bar link bolts.
- Using a metric socket and a torque wrench, tighten the bolts to the manufacturer's specified torque. (Consult repair manual for specific value).
- Reinstall the wheel and lower the vehicle.
- Re-torque the wheel lugs.
Rear Control Arm Bolt Torque Procedure
Detailed steps for tightening the rear control arm bolts on a 2016-Present Audi A5.
- Loosen the wheel lugs and lift the vehicle.
- Remove the wheel.
- Locate the rear control arm bolts.
- Using a metric socket and a torque wrench, tighten the bolts to the manufacturer's specified torque. (Consult repair manual for specific value).
- Reinstall the wheel and lower the vehicle.
- Re-torque the wheel lugs.
Rear Sway Bar Link Bolt Torque Procedure
Detailed steps for tightening the rear sway bar link bolts on a 2016-Present Audi A5.
- Loosen the wheel lugs and lift the vehicle.
- Remove the wheel.
- Locate the rear sway bar link bolts.
- Using a metric socket and a torque wrench, tighten the bolts to the manufacturer's specified torque. (Consult repair manual for specific value).
- Reinstall the wheel and lower the vehicle.
- Re-torque the wheel lugs.
Technical Service Bulletins
Front Suspension Creaking Noise
2017-05-15Some 2016-2017 Audi A5 models may experience a creaking noise from the front suspension. This is often caused by insufficient torque on control arm bolts, particularly after previous service.
Resolution: Retorque all front suspension control arm bolts to the specified torque, applying Loctite 243 threadlocker to the bolts. Ensure components are properly seated before torquing.
Rear Suspension Clunking Noise
2018-11-20A clunking noise from the rear suspension can occur on some 2017-2018 Audi A5 models. This may result from improper torque on sway bar link or control arm bolts.
Resolution: Inspect all rear suspension components, and verify proper torque on sway bar link and control arm bolts. Use a new bolt when one shows any evidence of damage.
Steering Vibration After Suspension Work
2020-07-01Steering vibration after any work done on the suspension on a 2018-2020 Audi A5 may indicate improperly torqued bolts within the suspension system. Control arm bolt torque and wheel alignment should be checked.
Resolution: Verify torque of all suspension bolts (front and rear), with the vehicle on its wheels. Perform a proper wheel alignment after the bolts have been tightened. Ensure the subframe is aligned correctly. Inspect for damage to the suspension and steering components.
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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.