Audi Audi A4 2009-2016 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi A4 2009-2016

Audi Audi A4 2009-2016 Suspension Bolt Torque Specifications

Comprehensive torque specifications for suspension bolts on the 2009-2016 Audi A4 (B8) platform, covering front and rear 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 front suspension components.

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated bolt size and torque value. Typically applies to both upper and lower strut mounting bolts. Ensure vehicle is at ride height.
2

Steering Knuckle To Strut/Shock Absorber Mounting Bolts

M12 x 1.75 (Estimated)
Important Notes
Estimated bolt size and torque value with angle. Value and procedure will vary greatly by application, always refer to the correct manual. Ensure vehicle is at ride height.
3

Control Arm Bolts

M14 x 1.5 (Estimated)
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Estimated bolt size and torque. Ensure vehicle is at ride height before completing torque. These are typically large diameter bolts.
4

Lower Control Arm Ball Joint Pinch Bolt

M10 x 1.25 (Estimated)
Important Notes
Estimated bolt size and torque with angle. The final tightening procedure may vary significantly, verify with the manual. Ensure vehicle is at ride height.
5

Ball Joint Nut

M12 x 1.5 (Estimated)
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated bolt size and torque value. Ensure vehicle is at ride height.
6

Tie Rod End Nut

M10 x 1.25 (Estimated)
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Estimated bolt size and torque value. Ensure vehicle is at ride height and steering wheel is centered.
7

Sway Bar Link Nut

M10 x 1.5 (Estimated)
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Estimated bolt size and torque value. Ensure vehicle is at ride height.
8

Sway Bar Mounting Bracket Bolts

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated bolt size and torque value. The size and location of these bolts can vary greatly so consult an accurate manual for the exact value. Ensure vehicle is at ride height.
9

Strut Top Mount Bolts/Nuts

M8 x 1.25 (Estimated)
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated bolt size and torque value. Always verify with service manual. These bolts are typically smaller diameter. Ensure vehicle is at ride height.

Rear Suspension

Torque specifications for rear suspension components.

1

Rear Axle/Trailing Arm Bolts

M14 x 1.5 (Estimated)
Important Notes
Estimated bolt size and torque with angle. The final tightening procedure may vary significantly, verify with the manual. Ensure vehicle is at ride height.

Chassis Components

Torque specifications for chassis components related to the suspension.

1

Subframe Bolts

M14 x 1.5 (Estimated)
Important Notes
Estimated bolt size and torque with angle. The value varies greatly by vehicle application, verify with the manual. Ensure vehicle is at ride height.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.75 (Estimated)
Torque Value
89 ft-lbs (120 N·m)
Important Notes
Estimated bolt size and torque value. Ensure proper installation of brake hardware. These bolts are often directly bolted to the steering knuckle/wheel carrier.

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 is using the correct torque specification important?

Using the correct torque specification is critical for the safe and proper function of your vehicle's suspension. Under-torqued bolts can loosen over time, leading to component failure and potential accidents. Over-torqued bolts can stretch or break, also causing component failure and difficulty with future repairs. Correct torque ensures that the components are held securely at the designed tension.

Q2

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

A torque wrench is essential for accurately tightening bolts to the specified values. Guessing or 'hand tightening' is not acceptable for suspension components. Without a torque wrench, you risk under or over-tightening the bolts, which can lead to dangerous situations. Rent or borrow a torque wrench or seek professional help if you do not have access to one.

Q3

Should I use new bolts when replacing suspension components?

Yes, it is generally recommended to use new bolts when replacing suspension components. Many bolts, especially those used in high-stress areas like the suspension, are torque-to-yield (TTY) bolts. TTY bolts are designed to stretch upon installation and should not be reused. Using old bolts can lead to incorrect torque readings, failures, and unsafe conditions.

Q4

How often should I check my suspension bolts?

Suspension bolts should be checked periodically, especially after recent work or after heavy use such as off-road driving. It's a good idea to visually inspect them at each tire rotation, which is generally every 5,000-7,000 miles. If you notice any unusual noises, handling changes, or if a collision has occurred, have your suspension checked immediately.

Q5

Can temperature affect torque specifications?

Yes, temperature can affect torque specifications, especially on aluminum components. Torque specifications are usually given at room temperature. If working in extreme hot or cold conditions, consult the Audi service manual or a qualified technician for adjustments. The expansion and contraction of metals due to temperature may cause inaccurate torque readings. For most home mechanics, work done at room temperature (60-80F) will be fine.

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

A calibrated torque wrench is essential for achieving accurate bolt torque, preventing over or under tightening.

  • Adjustable torque settings
  • Clearly marked scale
  • Click or digital indication when target torque is reached
Learn more

Socket Set

A comprehensive socket set, including metric sizes common on Audi vehicles, is needed for attaching to bolts and fasteners.

  • Variety of sizes including deep sockets
  • 6-point or 12-point options
  • Durable chrome vanadium construction
Learn more

Extension Bars

Extension bars allow access to recessed bolts and fasteners that may be difficult to reach with the torque wrench alone.

  • Various lengths for added reach
  • Secure connection to sockets and wrenches
  • Durable construction to withstand torque application
Learn more

Wrench Adapters

Adapters may be needed for various bolt heads and tight access points. Universal joint adapters are especially helpful.

  • Various drive sizes
  • Allows socket articulation with universal joint adapters
  • Durable construction for heavy duty application
Learn more
Service Procedures

Front Suspension Lower Control Arm Bolt Torque

This procedure outlines the steps to properly torque the lower control arm bolts on the front suspension.

  • 1. Locate the lower control arm bolts securing it to the subframe.
  • 2. Using the correct size socket, initially tighten all bolts by hand.
  • 3. With the vehicle weight on the wheels, Torque the horizontal bolts to 70Nm + 90 degrees.
  • 4. Then, Torque the Vertical nut to 70Nm + 90 degrees.
  • 5. Verify the torque of all bolts a second time.
View full procedure

Front Upper Control Arm Bolt Torque

This procedure outlines the steps to properly torque the upper control arm bolts on the front suspension.

  • 1. Locate the upper control arm bolts securing it to the suspension tower.
  • 2. Using the correct size socket, initially tighten all bolts by hand.
  • 3. Torque all Upper control arm bolts to 40Nm + 90 degrees.
  • 4. Verify the torque of all bolts a second time.
View full procedure

Rear Suspension Upper Control Arm Bolt Torque

This procedure outlines the steps to properly torque the upper control arm bolts on the rear suspension.

  • 1. Locate the upper control arm bolts securing it to the body.
  • 2. Using the correct size socket, initially tighten all bolts by hand.
  • 3. Torque all Upper control arm bolts to 40Nm + 90 degrees.
  • 4. Verify the torque of all bolts a second time.
View full procedure

Rear Suspension Lower Control Arm Bolt Torque

This procedure outlines the steps to properly torque the lower control arm bolts on the rear suspension.

  • 1. Locate the lower control arm bolts securing it to the subframe and upright.
  • 2. Using the correct size socket, initially tighten all bolts by hand.
  • 3. With the vehicle weight on the wheels, Torque the body side horizontal bolts to 70Nm + 90 degrees.
  • 4. Then, Torque the upright connection horizontal bolt to 70Nm + 90 degrees.
  • 5. Verify the torque of all bolts a second time.
View full procedure

Sway Bar Link Bolt Torque

This procedure outlines the steps to properly torque the sway bar link bolts on both front and rear suspension.

  • 1. Locate the sway bar link bolts connecting to the sway bar and control arms.
  • 2. Using the correct size socket, initially tighten all bolts by hand.
  • 3. Torque the sway bar link bolts to 40Nm.
  • 4. Verify the torque of all bolts a second time.
View full procedure
Technical Service Bulletins

Suspension Noise Due to Incorrect Bolt Torque

2012-05-15

Some vehicles may exhibit suspension noises due to improper torque applied to the suspension bolts during assembly or service. This bulletin highlights the need for correct torquing procedure.

2009-2012

Resolution: Verify all suspension bolt torques are to the factory specification, replace any stretched bolts.

Control Arm Bolt Loosening After Service

2015-11-20

Control arm bolts on some vehicles may become loose after service due to improper initial torque or re-use of torque to yield bolts. Always use new bolts where specified and use proper torquing procedures.

2013-2016

Resolution: Inspect for play or loose bolts. Torque all control arm bolts to specification. Replace bolts as required.

About the Author

Expert automotive knowledge and experience

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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