Audi Audi A4 2005-2008 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi A4 2005-2008

Audi Audi A4 2005-2008 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2005-2008 Audi A4 (B7) chassis. 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 front suspension components.

1

Strut/Shock Absorber Mounting Bolts

M14 x 2.0 (Estimated)
Torque Value
55 ft-lbs (75 N·m)
Important Notes
General torque for strut/shock absorber to knuckle or chassis. Verify exact spec in manual. Estimated bolt size and thread pitch.
2

Upper Strut Mount Bolts to Chassis

M10 x 1.5 (Estimated)
Important Notes
Torque to 22 ft-lbs, then tighten an additional 90 degrees. Estimated values. Always verify in service manual. May require a new fastener.
3

Control Arm Bolts

M14 x 2.0 (Estimated)
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Torque for control arm to chassis and control arm to hub knuckle bolts. Estimated bolt size and thread pitch.
4

Ball Joint Nut

M12 x 1.75 (Estimated)
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Torque for securing the ball joint stud. Estimated bolt size and thread pitch.
5

Lower Ball Joint Pinch Bolt

M12 x 1.75 (Estimated)
Torque Value
25 ft-lbs (35 N·m)
Important Notes
Torque for securing lower ball joint on applications where applicable. Estimated bolt size and thread pitch.
6

Tie Rod End Nut

M12 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Torque for tie rod end to steering knuckle. Estimated bolt size and thread pitch.
7

Sway Bar Link Nut

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Torque for sway bar link to control arm or strut. Estimated bolt size and thread pitch.

Rear Suspension

Torque specifications for rear suspension components.

1

Strut/Shock Absorber Mounting Bolts

M14 x 2.0 (Estimated)
Torque Value
55 ft-lbs (75 N·m)
Important Notes
General torque for strut/shock absorber to knuckle or chassis. Verify exact spec in manual. Estimated bolt size and thread pitch.
2

Upper Strut Mount Bolts to Chassis

M10 x 1.5 (Estimated)
Important Notes
Torque to 22 ft-lbs, then tighten an additional 90 degrees. Estimated values. Always verify in service manual. May require a new fastener.
3

Control Arm Bolts

M14 x 2.0 (Estimated)
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Torque for control arm to chassis and control arm to hub knuckle bolts. Estimated bolt size and thread pitch.
4

Ball Joint Nut

M12 x 1.75 (Estimated)
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Torque for securing the ball joint stud. Estimated bolt size and thread pitch.
5

Lower Ball Joint Pinch Bolt

M12 x 1.75 (Estimated)
Torque Value
25 ft-lbs (35 N·m)
Important Notes
Torque for securing lower ball joint on applications where applicable. Estimated bolt size and thread pitch.
6

Tie Rod End Nut

M12 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Torque for tie rod end to steering knuckle. Estimated bolt size and thread pitch.
7

Sway Bar Link Nut

M10 x 1.5 (Estimated)
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Torque for sway bar link to control arm or strut. Estimated bolt size and thread pitch.

Sway Bar

Torque specifications for the sway bar and related mounting components.

1

Sway Bar Mounting Bracket Bolts to Chassis

M8 x 1.25 (Estimated)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Torque for securing the sway bar mounting bracket to chassis. Estimated bolt size and thread pitch.

Subframe

Torque specifications for the front and rear subframe mounting bolts.

1

Front Subframe Bolts

M14 x 2.0 (Estimated)
Important Notes
Torque to 74 ft-lbs, then tighten an additional 90 degrees. Estimated values. Always verify in service manual. May require new fasteners. Estimated bolt size and thread pitch.
2

Rear Subframe Bolts

M14 x 2.0 (Estimated)
Important Notes
Torque to 74 ft-lbs, then tighten an additional 90 degrees. Estimated values. Always verify in service manual. May require new fasteners. Estimated bolt size and thread pitch.

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 torque specifications important for suspension bolts?

Proper torque is crucial for suspension bolt integrity. Under-tightening can lead to bolts loosening, causing instability and potential component failure. Over-tightening can stretch or break the bolts, weakening the joint and potentially damaging the threaded holes or causing material fatigue. Using a torque wrench ensures proper clamping force, maintaining joint stability and the intended performance of the suspension system.

Q2

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

Without a torque wrench, it's very difficult to achieve the correct bolt tension. You risk either under-tightening, which can cause components to shift, resulting in vibrations, noises, and premature wear, or over-tightening, which can damage threads, bolts, or the suspension components themselves. Either scenario compromises vehicle safety and handling.

Q3

Should I use new bolts when servicing suspension components?

It's generally recommended to replace one-time use bolts. These are often torque-to-yield bolts that deform during tightening and should not be reused. They can lose their strength and proper clamping force if reused, even if they appear to be in good condition. Refer to the service manual for specific instructions regarding bolt replacement.

Q4

What should I do if a suspension bolt is seized or stripped?

If a bolt is seized, use penetrating oil and allow time for it to work. If it's still stuck, consider using a heat gun. Do not force the bolt. If stripped, the hole will need to be repaired, which might require re-tapping or using a thread repair kit. Attempting to torque a damaged bolt can lead to further damage.

Q5

Are there different torque specs for aluminum vs. steel suspension components?

Yes, generally torque specifications are material dependent. Aluminum suspension components may have lower torque requirements than steel parts. The specific torque specifications for each bolt are based on the materials used and their clamping forces needed. Always consult the vehicle's service manual for the correct specifications based on the materials present.

Q6

What if my torque wrench is not very accurate?

If your torque wrench is not accurate, it's better to avoid it. Using an inaccurate tool can lead to incorrect torque application, resulting in potential issues. Get your wrench calibrated periodically. If calibration is not an option, consider purchasing a reliable, new torque wrench from a well-known manufacturer to guarantee a safe installation.

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 the specified values. A 1/2" drive is common for suspension work.

  • Click-type for accurate torque application
  • Wide torque range to cover all suspension fasteners
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is useful for smaller fasteners found in the suspension.

  • Click-type for accurate torque application
  • Lower torque range for smaller fasteners
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt and nut sizes used in the suspension system.

  • Wide range of sizes, including deep sockets
  • High-quality construction for durability
Learn more

Wrench Set (Metric)

A set of metric wrenches is useful for accessing nuts and bolts in tight spaces.

  • Combination wrenches for versatility
  • High-quality construction for durability
Learn more

Jointed Extension

A jointed extension provides additional reach for hard-to-access suspension components.

  • Allows access at different angles
  • Durable construction
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the front upper control arms.

  • Loosen the lug bolts of the front wheels slightly and raise the front of the vehicle and support on jack stands. Remove the wheels.
  • Locate the upper control arm bolts.
  • Using the correct size socket and torque wrench, tighten the inboard upper control arm bolt to 40 Nm (30 ft-lb) and then turn an additional 90 degrees. Tighten the outboard upper control arm bolt to 40 Nm (30 ft-lb) and then turn an additional 90 degrees.
  • Repeat on the other side.
  • Reinstall the wheels, lower the vehicle and tighten lug bolts.
  • Lower the vehicle and final tighten the wheel bolts.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the front lower control arms.

  • Loosen the lug bolts of the front wheels slightly and raise the front of the vehicle and support on jack stands. Remove the wheels.
  • Locate the front lower control arm bolts.
  • Using the correct size socket and torque wrench, tighten the inboard lower control arm bolt to 70 Nm (52 ft-lb) and then turn an additional 90 degrees. Tighten the outboard lower control arm bolt to 70 Nm (52 ft-lb) and then turn an additional 90 degrees.
  • Repeat on the other side.
  • Reinstall the wheels, lower the vehicle and tighten lug bolts.
  • Lower the vehicle and final tighten the wheel bolts.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the rear lower control arms.

  • Loosen the lug bolts of the rear wheels slightly and raise the rear of the vehicle and support on jack stands. Remove the wheels.
  • Locate the rear lower control arm bolts.
  • Using the correct size socket and torque wrench, tighten the inboard rear lower control arm bolt to 70 Nm (52 ft-lb) and then turn an additional 90 degrees. Tighten the outboard rear lower control arm bolt to 70 Nm (52 ft-lb) and then turn an additional 90 degrees.
  • Repeat on the other side.
  • Reinstall the wheels, lower the vehicle and tighten lug bolts.
  • Lower the vehicle and final tighten the wheel bolts.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the rear upper control arms.

  • Loosen the lug bolts of the rear wheels slightly and raise the rear of the vehicle and support on jack stands. Remove the wheels.
  • Locate the rear upper control arm bolts.
  • Using the correct size socket and torque wrench, tighten the inboard rear upper control arm bolt to 40 Nm (30 ft-lb) and then turn an additional 90 degrees. Tighten the outboard rear upper control arm bolt to 40 Nm (30 ft-lb) and then turn an additional 90 degrees.
  • Repeat on the other side.
  • Reinstall the wheels, lower the vehicle and tighten lug bolts.
  • Lower the vehicle and final tighten the wheel bolts.
View full procedure

Sway Bar End Link Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bolts securing the front and rear sway bar end links.

  • Loosen the lug bolts of the wheels slightly and raise the vehicle and support on jack stands. Remove the wheels.
  • Locate the sway bar end link bolts at the sway bar and the control arm.
  • Using the correct size socket and torque wrench, tighten the front and rear end link bolts to 40 Nm (30 ft-lb) and then turn an additional 90 degrees
  • Repeat on the other side.
  • Reinstall the wheels, lower the vehicle and tighten lug bolts.
  • Lower the vehicle and final tighten the wheel bolts.
View full procedure
Technical Service Bulletins

Suspension Bolt Loosening Issues

2007-05-15

Some vehicles have exhibited issues with suspension bolts loosening over time. This can lead to premature wear and changes in alignment.

2005-2008 Audi A4

Resolution: Inspect suspension bolts during regular maintenance. Ensure proper torque is applied, replacing stretch bolts where necessary. Consider using thread-locking compound on bolts that are prone to loosening.

Creaking Sounds from Front Suspension

2006-12-01

Reports of creaking sounds emanating from the front suspension, especially during turning at low speeds.

2005-2006 Audi A4

Resolution: Thoroughly inspect the upper and lower control arms, including all bushings for wear and damage. Retorque all suspension fasteners to specifications. Replace worn components.

Rear Suspension Alignment Issues

2008-03-20

Some vehicles are exhibiting issues with maintaining proper rear alignment, even after an alignment service.

2007-2008 Audi A4

Resolution: Inspect rear subframe bolts and control arm mounting points. Ensure all bolts are torqued to the correct specifications. If components are worn or damaged replace them before performing the alignment.

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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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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