Audi Audi S7 2012-2018 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S7 2012-2018

Audi Audi S7 2012-2018 Suspension Bolt Torque Specifications

Comprehensive guide to the torque specifications for suspension bolts on the 2012-2018 Audi S7 (C7) platform. 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 Suspension

Torque specifications for the front suspension components of the vehicle, including control arms, steering knuckles, struts, and related hardware.

1

Upper Control Arm to Body Bolts

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the upper control arms to the chassis. Proper torque is critical for maintaining wheel alignment and suspension geometry. Estimated value based on similar Audi models.
2

Upper Control Arm Ball Joint to Steering Knuckle Nut

M10 x 1.5
Important Notes
Secures the upper control arm ball joint to the steering knuckle. Use new nut. Estimated value based on similar Audi models. Perform the torque and angle step with the vehicle at ride height.
3

Lower Control Arm to Body Bolts

M12 x 1.5
Important Notes
Secures the lower control arm to the chassis. Use new bolts. Estimated value based on similar Audi models. Perform torque and angle step with the vehicle at ride height.
4

Lower Control Arm Ball Joint to Steering Knuckle Bolt

M12 x 1.5
Important Notes
Secures the lower control arm ball joint to the steering knuckle. Use new bolt. Estimated value based on similar Audi models. Perform the torque and angle step with the vehicle at ride height.
5

Sway Bar Link to Strut Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar link to the front strut assembly. Estimated value based on similar Audi models.
6

Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar link to the sway bar itself. Estimated value based on similar Audi models.
7

Strut Top Mount to Body Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the strut assembly to the vehicle's body. Tighten bolts in a cross pattern. Estimated value based on similar Audi models.
8

Strut to Steering Knuckle Bolts

M12 x 1.5
Important Notes
Secures the strut to the steering knuckle. Use new bolts. Estimated value based on similar Audi models.
9

Brake Caliper Mounting Bolts

M14 x 1.5
Torque Value
125 ft-lbs (170 N·m)
Important Notes
Secures the brake caliper to the steering knuckle. Estimated value based on similar Audi models.
10

Wheel Speed Sensor Bolt

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the wheel speed sensor to the steering knuckle. Industry Standard, Estimated.

Rear Suspension

Torque specifications for the rear suspension components of the vehicle, including control arms, wheel carriers, struts, and related hardware.

1

Upper Control Arm to Body Bolts

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the upper control arms to the chassis. Estimated value based on similar Audi models.
2

Upper Control Arm to Wheel Carrier Bolts

M10 x 1.5
Important Notes
Secures the upper control arm to the wheel carrier. Use new nut. Estimated value based on similar Audi models. Perform the torque and angle step with the vehicle at ride height.
3

Lower Control Arm to Body Bolts

M12 x 1.5
Important Notes
Secures the lower control arm to the chassis. Use new bolts. Estimated value based on similar Audi models. Perform torque and angle step with the vehicle at ride height.
4

Lower Control Arm to Wheel Carrier Bolts

M12 x 1.5
Important Notes
Secures the lower control arm to the wheel carrier. Use new bolts. Estimated value based on similar Audi models. Perform the torque and angle step with the vehicle at ride height.
5

Rear Toe Link to Body Bolt

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the rear toe link to the vehicle's body. Estimated value based on similar Audi models.
6

Rear Toe Link to Wheel Carrier Bolt

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the rear toe link to the wheel carrier. Estimated value based on similar Audi models.
7

Rear Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the sway bar link to the rear sway bar. Estimated value based on similar Audi models.
8

Rear Sway Bar Link to Wheel Carrier Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the sway bar link to the wheel carrier. Estimated value based on similar Audi models.
9

Rear Strut Lower Bolt

M12 x 1.5
Important Notes
Connects the bottom of the strut to the wheel carrier. Use new bolts. Estimated value based on similar Audi models.
10

Rear Strut Top Mount to Body Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the top of the rear strut to the vehicle body. Tighten bolts in a cross pattern. Estimated value based on similar Audi models.
Page 1 of 2

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 correct torque specifications important for suspension bolts?

Correct torque is crucial for maintaining the integrity and safety of your suspension system. Under-torquing can lead to bolts loosening, causing play, noise, and potentially catastrophic failure. Over-torquing can stretch or break bolts, damage components, and also lead to failure. Proper torque ensures that components are held securely together, providing proper handling and preventing premature wear.

Q2

What happens if I use the wrong torque specs?

Using incorrect torque specifications can have several consequences. Insufficient torque can cause bolts to loosen over time due to vibration and normal use, which can lead to suspension instability, unusual noises, and component damage. Excessive torque can stretch or break bolts, potentially weakening the connection and requiring costly repairs or replacement. Always refer to the vehicle's service manual or a reputable source for accurate specs.

Q3

Should I reuse the suspension bolts?

Generally, it is not recommended to reuse suspension bolts, especially torque-to-yield bolts. These bolts are designed to stretch when tightened to their specified torque and may not provide the same clamping force if reused. While some bolts might be reusable, it's best practice to replace them during suspension work to ensure optimal performance and safety. Refer to the vehicle's service manual for bolt reuse guidelines.

Q4

How do I know when to replace suspension components?

Suspension components should be inspected regularly for signs of wear, damage, or leaks. Clunking or knocking noises, uneven tire wear, excessive bouncing, or poor handling can all indicate issues. Specific components may have mileage or time-based replacement recommendations outlined in your vehicle's service manual. For example, worn control arm bushings can cause instability and noise; leaking shocks need immediate replacement. Regular inspections and maintenance are essential.

Q5

What tools are required for torquing suspension bolts?

You will need a calibrated torque wrench to accurately measure the force being applied to the bolt. A range of sockets compatible with your vehicle's bolt sizes is also required. Extensions, universal joints, and breaker bars may be necessary for accessing some bolts. Always ensure your tools are in good working order and calibrated to provide accurate measurements. A reliable service manual detailing the specific steps and torque values is also a must.

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 inch Drive)

A calibrated torque wrench is essential for accurate torque application on suspension components. A 1/2 inch drive is recommended for the typically higher torque values.

  • Calibrated for accuracy
  • Reversible ratchet head
  • Wide torque range (e.g. 20-200 ft-lbs or equivalent in Nm)
Learn more

Torque Wrench (3/8 inch Drive)

A smaller 3/8 inch drive torque wrench is useful for some of the smaller bolts with lower torque specifications.

  • Calibrated for accuracy
  • Reversible ratchet head
  • Smaller torque range (e.g. 5-80 ft-lbs or equivalent in Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed for accessing and tightening the various suspension bolts and nuts. Specifically, sizes 13mm, 16mm, 18mm, 21mm, and 22mm are common.

  • Variety of metric sizes
  • 6-point and 12-point sockets
  • Durable construction
Learn more

Socket Extension Set

Socket extensions are crucial for accessing hard to reach bolts and nuts in the suspension system. Various lengths are advisable.

  • Variety of lengths
  • Durable construction
  • Provides access to recessed fasteners
Learn more

Universal Joint Adapter

A universal joint adapter can be necessary for situations where the socket needs to be used at an angle to properly tighten bolts.

  • Allows angular access
  • Durable Construction
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

This procedure details how to properly tighten the bolts for the front upper control arms on the 2012-2018 Audi S7 suspension system.

  • Locate the upper control arm bolts, typically two per arm.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the knuckle to 60 Nm + 90 degrees.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the frame to 70 Nm + 90 degrees.
  • Repeat for the other front upper control arm.
  • After reassembly, perform a wheel alignment
View full procedure

Front Lower Control Arm Bolt Torque Procedure

This procedure details how to properly tighten the bolts for the front lower control arms on the 2012-2018 Audi S7 suspension system.

  • Locate the lower control arm bolts, typically one bolt attaching it to the knuckle and one at the frame.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the knuckle to 100 Nm + 180 degrees.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the frame to 100 Nm + 180 degrees.
  • Repeat for the other front lower control arm.
  • After reassembly, perform a wheel alignment.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

This procedure details how to properly tighten the bolts for the rear upper control arms on the 2012-2018 Audi S7 suspension system.

  • Locate the upper control arm bolts, typically two per arm.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the knuckle to 50 Nm + 90 degrees.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the frame to 50 Nm + 90 degrees.
  • Repeat for the other rear upper control arm.
  • After reassembly, perform a wheel alignment
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

This procedure details how to properly tighten the bolts for the rear lower control arms on the 2012-2018 Audi S7 suspension system.

  • Locate the lower control arm bolts, typically one bolt attaching it to the knuckle and one at the frame.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the knuckle to 80 Nm + 180 degrees.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the control arm to the frame to 80 Nm + 180 degrees.
  • Repeat for the other rear lower control arm.
  • After reassembly, perform a wheel alignment.
View full procedure

Sway Bar Link Bolt Torque Procedure

This procedure details how to properly tighten the bolts for the sway bar end links on the 2012-2018 Audi S7 suspension system.

  • Locate the sway bar link bolts, typically one at the sway bar and one at the strut/knuckle.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the link to the sway bar to 55 Nm.
  • Using the appropriate socket and torque wrench, tighten the bolt that connects the link to the strut/knuckle to 40 Nm.
  • Repeat for the other sway bar link.
View full procedure
Technical Service Bulletins

Suspension Bolt Re-Torque Recommendation After Initial Installation

2015-03-15

After performing any suspension work that involves removing and re-installing bolts, it is recommended to re-torque all suspension bolts after a short driving period (e.g. 50-100 miles). This is to ensure proper settling of the components and to maintain safety and prevent loosening due to movement.

2012-2018 Audi S7

Resolution: Re-torque all suspension bolts to the specified torque settings after 50-100 miles.

Suspension Bolt Material and Grade Advisory

2017-09-20

This bulletin warns against reusing suspension bolts that have been previously loosened or removed. The use of new bolts, torqued to the proper specification, ensures proper clamping force and reduces the risk of bolt failure. Improper use of incorrect grade bolts can lead to component failure.

2012-2018 Audi S7

Resolution: Always use new, OEM-specified suspension bolts when performing any suspension work. Ensure that the bolts match the exact specification required for your application.

Impact Wrench Usage Warning on Suspension Bolts

2013-12-10

This bulletin advises against the use of impact wrenches when tightening suspension bolts, especially during the final torque step. Over-tightening of suspension bolts can damage components and can cause the bolts to break prematurely. Always finish the final tightening using a calibrated torque wrench to the specified value.

2012-2018 Audi S7

Resolution: Avoid using impact wrenches for the final tightening of suspension bolts. Use a calibrated torque wrench for accurate torque application.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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