Audi Audi RS4 2005-2008 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2005-2008 Audi RS4 (B7) chassis. Includes front and rear suspension components, ensuring proper installation and safety.

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 Upper Control Arms

Torque specifications for the front upper control arm components, which are crucial for maintaining front suspension geometry.

1

Upper Control Arm to Frame (Inner Bolts)

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure proper alignment before final tightening.
2

Upper Control Arm Ball Joint Nut (Pinch Bolt)

M10 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure the ball joint is properly seated before tightening.

Front Suspension Lower Control Arms

Torque specifications for the front lower control arm components, which are critical for vehicle stability and handling.

1

Lower Control Arm to Frame (Inner Bolts)

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Estimated value based on similar models and bolt size. These bolts are under high stress. Ensure proper alignment.
2

Lower Control Arm to Steering Knuckle Ball Joint Nut

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure the ball joint is properly seated before tightening.

Front Suspension Strut

Torque specifications for the front strut assembly, including its connection to the steering knuckle.

1

Strut/Shock to Steering Knuckle Bolts

M12 x 1.5
Important Notes
Angle torque is required for proper clamping. Tighten to 59 ft-lbs (80 N·m) first, then an additional 90 degree turn.

Front Suspension Sway Bar

Torque specifications for the front sway bar components, including end links and bushing brackets.

1

Sway Bar End Link to Strut Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Estimated value based on similar models and bolt size.
2

Sway Bar End Link to Sway Bar Nut

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Estimated value based on similar models and nut size.
3

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure even tightening to prevent damage to the bushings.

Rear Suspension Upper Control Arms

Torque specifications for the rear upper control arm components, critical for maintaining rear suspension geometry.

1

Upper Control Arm to Frame (Inner Bolts)

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure proper alignment before final tightening.
2

Upper Control Arm to Upright Ball Joint Nut (Pinch Bolt)

M10 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure the ball joint is properly seated before tightening.

Rear Suspension Lower Control Arms

Torque specifications for the rear lower control arm components, crucial for stability and handling.

1

Lower Control Arm to Frame (Inner Bolts)

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Estimated value based on similar models and bolt size. These bolts are under high stress. Ensure proper alignment.
2

Lower Control Arm to Upright Ball Joint Nut

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure the ball joint is properly seated before tightening.

Rear Suspension Toe Control Arms

Torque specifications for the rear toe control arm components, important for wheel alignment.

1

Toe Control Arm to Upright Bolt

M12 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Estimated value based on similar models and bolt size. Do not overtighten; may affect alignment adjustment.
2

Toe Control Arm to Subframe Bolt

M12 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure proper alignment.

Rear Suspension Strut

Torque specifications for the rear strut assembly, including its connection to the upright.

1

Strut/Shock to Upright Bolts

M12 x 1.5
Important Notes
Angle torque is required for proper clamping. Tighten to 59 ft-lbs (80 N·m) first, then an additional 90 degree turn.

Rear Suspension Sway Bar

Torque specifications for the rear sway bar components, including end links and bushing brackets.

1

Sway Bar End Link to Strut Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Estimated value based on similar models and bolt size.
2

Sway Bar End Link to Sway Bar Nut

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Estimated value based on similar models and nut size.
3

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar models and bolt size. Ensure even tightening to prevent damage to the bushings.

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 so important for suspension bolts?

Correct torque specifications ensure proper clamping force, preventing bolts from loosening due to vibration and stress, which can lead to suspension failure, instability, and even accidents. Overtightening can damage threads or weaken components, while undertightening allows movement, leading to premature wear and potential failure.

Q2

What happens if I overtighten suspension bolts?

Overtightening can stretch or break bolts, damage threads in the control arms or subframe, and lead to distortion of components. This can result in weakened connections, premature wear, and difficulty in future disassembly. In a severe case, the bolt could snap, immediately leading to a suspension failure.

Q3

What happens if I undertighten suspension bolts?

Undertightened suspension bolts can allow movement within the connection, leading to accelerated wear of the bushings and bolt holes. The movement can also cause unwanted noises and negatively impact vehicle alignment. In the long term, it can cause damage to the threads and make it difficult to remove the bolt.

Q4

Should I use new bolts when working on my RS4's suspension?

It's highly recommended, especially for critical fasteners like those in the suspension system. Many suspension bolts are torque-to-yield (TTY), meaning they are designed to stretch slightly when tightened to their specification. These bolts cannot be reused effectively as their clamping force will be compromised. Using new bolts ensures the proper clamping force and avoids possible failure. Always refer to the manufacturer's service manual for specific guidance on bolt replacement.

Q5

Is it necessary to use a torque wrench?

Yes, absolutely. Relying on feel is inaccurate and dangerous for suspension components. A torque wrench provides precise measurement of the applied force, ensuring fasteners are tightened to the exact specifications. Using an improper method risks over- or under-tightening the bolts, causing the aforementioned dangers. Always check and double-check the accuracy of the torque wrench before using it.

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 accurate tightening of suspension bolts to prevent over or under-tightening.

  • Wide torque range suitable for suspension components
  • Click-type or digital readout for accuracy
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is beneficial for accessing tighter spaces and lower torque bolts.

  • Compact size for tight areas
  • Suitable for lower torque values
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit various bolt head sizes used on the RS4 suspension.

  • Variety of sizes including common suspension bolt sizes (e.g., 13mm, 16mm, 18mm, 21mm)
  • 6-point sockets recommended for better grip
Learn more

Extension Bars

Extension bars provide added reach and clearance when working on recessed bolts.

  • Various lengths for different needs
  • Allows access to tight spots
Learn more

Jointed Swivel Adapters

Allow for angled access to difficult-to-reach bolts.

  • Provides flexible access
  • Helps clear obstacles
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

This procedure outlines the steps for torquing the front upper control arm bolts on a 2005-2008 Audi RS4.

  • Loosen all upper control arm bolts.
  • Position the vehicle on a level surface with the suspension at normal ride height.
  • Torque the inner control arm bolts to 50 Nm + 90 degrees.
  • Torque the outer control arm bolts to 40 Nm + 90 degrees.
  • Verify the torque settings with a calibrated torque wrench.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

This procedure outlines the steps for torquing the front lower control arm bolts on a 2005-2008 Audi RS4.

  • Loosen all lower control arm bolts.
  • Position the vehicle on a level surface with the suspension at normal ride height.
  • Torque the inner lower control arm bolts to 70 Nm + 90 degrees.
  • Torque the outer lower control arm bolts to 40 Nm + 90 degrees.
  • Verify the torque settings with a calibrated torque wrench.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

This procedure outlines the steps for torquing the rear upper control arm bolts on a 2005-2008 Audi RS4.

  • Loosen all rear upper control arm bolts.
  • Position the vehicle on a level surface with the suspension at normal ride height.
  • Torque the inner upper control arm bolts to 50 Nm + 90 degrees.
  • Torque the outer upper control arm bolts to 40 Nm + 90 degrees.
  • Verify the torque settings with a calibrated torque wrench.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

This procedure outlines the steps for torquing the rear lower control arm bolts on a 2005-2008 Audi RS4.

  • Loosen all rear lower control arm bolts.
  • Position the vehicle on a level surface with the suspension at normal ride height.
  • Torque the inner lower control arm bolts to 70 Nm + 90 degrees.
  • Torque the outer lower control arm bolts to 40 Nm + 90 degrees.
  • Verify the torque settings with a calibrated torque wrench.
View full procedure
Technical Service Bulletins

Suspension Bolt Re-Torque After Initial Drive

2007-05-15

Technical bulletin advising re-torquing of suspension bolts after an initial period of driving to ensure proper settling and tightness.

2005-2008

Resolution: Re-torque all suspension bolts after approximately 50-100 miles of driving, following specified torque procedures. Inspect for any loose bolts or abnormal wear patterns.

Importance of Using New One-Time-Use Bolts

2006-11-20

Technical bulletin addressing the importance of replacing critical suspension bolts with new fasteners to maintain designed clamping forces.

2005-2008

Resolution: Always replace specified stretch or torque-to-yield bolts with new ones. Do not reuse old fasteners. Refer to the parts catalog for correct part numbers. Following torque settings correctly is also critical for proper preload.

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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