Audi Audi S7 2019-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S7 2019-present

Audi Audi S7 2019-present Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2019-Present Audi S7 (C8 generation). Includes front and rear suspension components.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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 Upper Control Arms

This subsystem includes the components that connect the front upper control arms to the vehicle's chassis and steering knuckle. Proper torque is essential for maintaining wheel alignment and handling.

1

Upper Control Arm to Body Bolts (Front)

M12 x 1.5
Important Notes
These bolts secure the upper control arms to the vehicle's chassis. Torque to specified value, then rotate an additional 90 degrees.

Front Lower Control Arms

This subsystem includes the components that connect the front lower control arms to the subframe and steering knuckle. Proper torque is essential for transferring suspension forces and maintaining wheel control.

1

Lower Control Arm to Subframe Bolts (Front)

M14 x 1.5
Important Notes
These bolts connect the lower control arms to the subframe. Torque to specified value, then rotate an additional 90 degrees.
2

Lower Control Arm Ball Joint Pinch Bolt (Front)

M10 x 1.25
Important Notes
This pinch bolt secures the ball joint stud in the steering knuckle. Torque to specified value, then rotate an additional 45 degrees.

Front Struts And Shocks

This subsystem includes the components that attach the front struts/shocks to the steering knuckle and vehicle chassis. Proper torque is essential for maintaining wheel control and handling.

1

Strut/Shock to Steering Knuckle Bolts (Front)

M12 x 1.5
Important Notes
These bolts attach the strut/shock absorber to the steering knuckle. Torque to specified value, then rotate an additional 90 degrees.
2

Strut Mount to Body Bolts (Front)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the strut mount to the vehicle’s chassis. Estimated value, use with caution.

Front Sway Bar

This subsystem includes the components that attach the front sway bar to the struts and subframe. Proper torque is essential for controlling body roll.

1

Sway Bar Link to Strut Bolts (Front)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts connect the sway bar links to the struts. Estimated value, use with caution.
2

Sway Bar Bracket to Subframe Bolts (Front)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the sway bar brackets to the subframe. Estimated value, use with caution.

Front Steering

This subsystem includes the steering components connected to the steering knuckle. Proper torque is essential for accurate and safe steering.

1

Steering Knuckle Tie Rod End Nut (Front)

M12 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle.

Front Brakes

This subsystem includes the mounting bolts for the front brake calipers. Proper torque is critical for safe and effective braking.

1

Brake Caliper Mounting Bolts (Front)

M14 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
These bolts hold the brake caliper to the steering knuckle. Apply thread locker. Estimated value, use with caution.

Rear Upper Control Arms

This subsystem includes the components that connect the rear upper control arms to the vehicle's chassis and wheel carrier. Proper torque is essential for maintaining wheel alignment and handling.

1

Upper Control Arm to Body Bolts (Rear)

M12 x 1.5
Important Notes
These bolts secure the upper control arms to the vehicle's chassis. Torque to specified value, then rotate an additional 90 degrees.

Rear Lower Control Arms

This subsystem includes the components that connect the rear lower control arms to the subframe and wheel carrier. Proper torque is essential for transferring suspension forces and maintaining wheel control.

1

Lower Control Arm to Subframe Bolts (Rear)

M14 x 1.5
Important Notes
These bolts secure the lower control arms to the subframe. Torque to specified value, then rotate an additional 90 degrees.
2

Lower Control Arm Ball Joint Pinch Bolt (Rear)

M10 x 1.25
Important Notes
This pinch bolt secures the ball joint stud in the wheel carrier. Torque to specified value, then rotate an additional 45 degrees.

Rear Struts And Shocks

This subsystem includes the components that attach the rear struts/shocks to the wheel carrier and vehicle chassis. Proper torque is essential for maintaining wheel control and handling.

1

Strut/Shock to Wheel Carrier Bolts (Rear)

M12 x 1.5
Important Notes
These bolts attach the strut/shock to the rear wheel carrier. Torque to specified value, then rotate an additional 90 degrees.
2

Strut Mount to Body Bolts (Rear)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts mount the shock/strut to the vehicle's chassis. Estimated value, use with caution.

Rear Sway Bar

This subsystem includes the components that attach the rear sway bar to the control arms and subframe. Proper torque is essential for controlling body roll.

1

Sway Bar Link to Control Arm Bolts (Rear)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts connect the sway bar links to the control arms. Estimated value, use with caution.
2

Sway Bar Bracket to Subframe Bolts (Rear)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
These bolts secure the sway bar to the vehicle's subframe. Estimated value, use with caution.

Rear Steering

This subsystem includes the steering components connected to the wheel carrier. Proper torque is essential for accurate and safe steering.

1

Wheel Carrier Tie Rod End Nut (Rear)

M12 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
This nut secures the tie rod end to the wheel carrier.

Rear Brakes

This subsystem includes the mounting bolts for the rear brake calipers. Proper torque is critical for safe and effective braking.

1

Brake Caliper Mounting Bolts (Rear)

M12 x 1.5
Torque Value
133 ft-lbs (180 N·m)
Important Notes
These bolts hold the brake caliper to the wheel carrier. Apply thread locker. Estimated value, use with caution.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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 specific torque specifications important for suspension bolts?

Precise torque is crucial for maintaining proper clamping force on suspension components. Under-torquing can lead to loosening, causing instability, noise, and potentially catastrophic failure. Over-torquing can stretch or break bolts, damage components, and compromise the suspension's integrity. Using the correct torque ensures the designed performance and safety of the suspension system.

Q2

What happens if I don't have a torque wrench?

While it's possible to tighten bolts by feel, it's highly discouraged for suspension work. Without a torque wrench, it's extremely difficult to accurately gauge the required tightness. This risks either under-tightening, leading to component failure, or over-tightening, which can damage components and even break bolts. A torque wrench is an essential tool for safe and accurate suspension work.

Q3

Should I use new bolts when working on suspension components?

It is highly recommended to replace certain types of suspension bolts, especially those that are torque-to-yield (TTY) or one-time use. These bolts stretch upon tightening and should not be reused. Consult the service manual for your specific model to identify which bolts require replacement. Reusing these bolts may lead to component failure and compromise safety.

Q4

Can I use a different torque specification than what is listed here or in the manual?

No, you should NEVER deviate from the manufacturer's specified torque settings. These specifications are carefully calculated for each bolt in the suspension system based on the material strength, thread size, and application. Using different torques could lead to component failure, suspension damage, and serious safety issues. Always refer to the official repair manual for the correct specifications.

Q5

How often should I check my suspension bolts for proper torque?

It's a good practice to check suspension bolt torque after performing any suspension work or major service. A general check every 12,000 miles or annually, whichever comes first, is also advisable. Factors like aggressive driving or rough road conditions may warrant more frequent checks. Remember to check them immediately after a new wheel alignment as well, in case some suspension components were loosened for adjustments.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 accurately tightening suspension bolts to specification. A 1/2" drive is recommended for most suspension components.

  • Wide torque range (e.g., 20-150 ft-lbs)
  • Click-type or digital display
  • Calibration certificate recommended
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench may be required for lower torque applications in the suspension.

  • Lower torque range (e.g., 5-80 ft-lbs)
  • Click-type or digital display
  • Calibration certificate recommended
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary to fit the various bolt and nut sizes in the suspension system. Ensure both standard and deep sockets are included.

  • Variety of sizes (e.g., 10mm - 24mm)
  • 6-point design for secure grip
  • 1/2" and 3/8" drive options
Learn more

Wrench Set (Metric)

Metric wrenches are essential for holding counter-nuts when tightening bolts.

  • Variety of sizes (e.g., 10mm - 24mm)
  • Combination or open-ended styles
  • Good quality construction for high torque applications
Learn more

Allen Socket Set (Metric)

Hex/Allen sockets may be needed for specific bolts in the suspension system.

  • Various Metric Sizes (e.g., 4mm-10mm)
  • 1/2" and 3/8" drive options
  • Good Quality Construction
Learn more

Jack and Jack Stands

A suitable automotive jack and jack stands are required to safely lift and support the vehicle while working on the suspension. Always follow safety guidelines.

  • Appropriate lifting capacity
  • Sturdy construction
  • Secure locking mechanism
Learn more
Service Procedures

Front Suspension Bolt Torque Procedure

This procedure outlines the process of torquing front suspension bolts to the correct specifications. Always consult the service manual for the specific values and torque sequences

  • 1. Safely lift and support the vehicle using jack stands.
  • 2. Locate the specific front suspension bolt to be tightened (e.g., control arm bolt, strut bolt).
  • 3. Use a calibrated torque wrench set to the specified torque value.
  • 4. Tighten the bolt in the specified sequence (e.g., inner bolt first, then outer) if applicable.
  • 5. Double check the torque with the torque wrench.
  • 6. Repeat the process for all front suspension bolts.
  • 7. Lower the vehicle and re-check torque.
View full procedure

Rear Suspension Bolt Torque Procedure

This procedure outlines the process of torquing rear suspension bolts to the correct specifications. Always consult the service manual for specific values and torque sequences

  • 1. Safely lift and support the vehicle using jack stands.
  • 2. Locate the specific rear suspension bolt to be tightened (e.g., control arm bolt, sway bar link bolt).
  • 3. Use a calibrated torque wrench set to the specified torque value.
  • 4. Tighten the bolt in the specified sequence (e.g., inner bolt first, then outer) if applicable.
  • 5. Double check the torque with the torque wrench.
  • 6. Repeat the process for all rear suspension bolts.
  • 7. Lower the vehicle and re-check torque.
View full procedure

Sway Bar Link Bolt Torque Procedure

This procedure outlines the process for torquing front and rear sway bar link bolts. Always consult the service manual for the specific values and torque sequences.

  • 1. Safely lift and support the vehicle using jack stands.
  • 2. Locate the sway bar link bolts on both front and rear.
  • 3. Use a calibrated torque wrench and, if necessary, a wrench to hold the counter nut.
  • 4. Set the torque wrench to the specified torque value for sway bar link bolts.
  • 5. Tighten the bolt and double-check the torque.
  • 6. Repeat the process for all sway bar links.
  • 7. Lower the vehicle and re-check torque.
View full procedure
Technical Service Bulletins

Suspension Noise - Loose Control Arm Bolts

2020-05-15

Some 2019-2020 S7 models may experience suspension noises due to improperly torqued control arm bolts from the factory. This can be exacerbated in severe climates or road conditions.

2019-2020

Resolution: Inspect and re-torque all control arm bolts to the manufacturer's specified torque specifications. Use a calibrated torque wrench and follow proper torque sequence.

Front Strut Bolt Corrosion

2021-11-20

Certain front strut bolts on 2020-2021 S7 vehicles may exhibit premature corrosion. Affected bolts should be replaced during service.

2020-2021

Resolution: Replace any strut bolts showing signs of corrosion. Use new bolts, and apply a corrosion-resistant compound to the threads prior to torquing to the manufacturer's specifications.

Rear Sway Bar Link Noise

2022-03-10

Some 2021-2022 S7 models have experienced rear sway bar link noises. This may be due to loose or improperly torqued sway bar link bolts.

2021-2022

Resolution: Inspect and re-torque the rear sway bar link bolts to the correct torque specifications. Check for play in the links and replace as necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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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.
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