Audi Audi RS4 2012-2015 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2012-2015

Audi Audi RS4 2012-2015 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2012-2015 Audi RS4 (B8) model. 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 Arm

Specifications for bolts related to the front upper control arm, connecting it to the vehicle body and the steering knuckle.

1

Upper Control Arm to Body Bolts (Front)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the upper control arm to the vehicle's body. Proper torque is crucial for correct suspension geometry and to prevent excessive play.
2

Upper Control Arm to Knuckle Bolt (Front)

M12 x 1.5
Important Notes
Attaches the upper control arm to the wheel hub knuckle. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint.

Front Lower Control Arm

Specifications for bolts related to the front lower control arm, connecting it to the vehicle body and the steering knuckle.

1

Lower Control Arm to Body Bolts (Front)

M14 x 1.5
Important Notes
These are torque-to-yield bolts. Always use new bolts when disassembling this joint. They bear significant loads during vehicle operation.
2

Lower Control Arm to Knuckle Bolt (Front)

M12 x 1.5
Important Notes
Attaches the lower control arm to the wheel hub knuckle. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint.

Front Sway Bar

Specifications for bolts related to the front sway bar and its end links.

1

Sway Bar End Link to Control Arm (Front)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar end link to the lower control arm. Estimated value, verify with OEM documentation if available.
2

Sway Bar End Link to Sway Bar (Front)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the sway bar end link to the sway bar itself. Estimated value, verify with OEM documentation if available.

Front Strut

Specifications for bolts related to the front strut assembly, including the top mount and connection to the steering knuckle.

1

Strut Top Mount to Body Bolts (Front)

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the strut top mount to the vehicle body. Proper torque prevents movement and vibration.
2

Strut to Knuckle Bolts (Front)

M14 x 1.5
Important Notes
Connects the strut assembly to the wheel hub knuckle. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint. Subject to high loads and is a safety-critical connection.

Rear Upper Control Arm

Specifications for bolts related to the rear upper control arm, connecting it to the vehicle body and the rear wheel hub knuckle.

1

Upper Control Arm to Body Bolts (Rear)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
These bolts secure the upper control arm to the vehicle body. Proper torque is crucial for maintaining suspension geometry and alignment.
2

Upper Control Arm to Knuckle Bolt (Rear)

M12 x 1.5
Important Notes
Connects the upper control arm to the rear wheel hub knuckle. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint.

Rear Lower Control Arm

Specifications for bolts related to the rear lower control arm, connecting it to the subframe and the rear wheel hub knuckle.

1

Lower Control Arm to Body Bolts (Rear)

M14 x 1.5
Important Notes
These bolts attach the lower control arm to the subframe and are torque-to-yield. Always use new bolts when disassembling this joint. They bear significant loads during cornering and acceleration.
2

Lower Control Arm to Knuckle Bolt (Rear)

M12 x 1.5
Important Notes
Connects the lower control arm to the wheel hub knuckle. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint. Critical for stability and handling.

Rear Sway Bar

Specifications for bolts related to the rear sway bar and its end links.

1

Sway Bar End Link to Control Arm (Rear)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar end link to the rear control arm. Estimated value, verify with OEM documentation if available.
2

Sway Bar End Link to Sway Bar (Rear)

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Securely attaches the sway bar end link to the sway bar. Estimated value, verify with OEM documentation if available.

Rear Shock Absorber

Specifications for bolts related to the rear shock absorber, connecting it to the suspension and chassis.

1

Rear Shock Absorber Lower Bolt

M14 x 1.5
Important Notes
Connects the bottom of the shock absorber to the suspension knuckle or arm. This is a critical load-bearing component. This is a torque-to-yield bolt. Always use new bolts when disassembling this joint.
2

Rear Shock Absorber Upper Bolt/Mount

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the top of the shock absorber or the top mount to the chassis. Ensures proper alignment and reduces NVH.

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 accurate torque specifications important for suspension bolts?

Accurate torque specifications are crucial for suspension bolt integrity and vehicle safety. Under-tightening can lead to components loosening during driving, causing instability and potential accidents. Over-tightening can damage threads, stretch bolts beyond their yield point, or crush components, ultimately compromising the suspension's structural integrity. Correct torque ensures proper clamping force, maintaining the desired alignment and performance characteristics of your RS4's suspension.

Q2

Can I reuse suspension bolts after removal?

Generally, it's recommended to replace suspension bolts, especially those that are torque-to-yield (TTY). TTY bolts are designed to stretch slightly upon tightening, and reusing them may compromise their strength and ability to maintain proper clamping force. Always consult your repair manual for specific recommendations. If your manual doesn't specify TTY bolts, inspect bolts carefully for damage and wear. If there's any doubt, replace them to be safe.

Q3

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

A torque wrench is essential for accurately tightening suspension bolts. Attempting to tighten them by 'feel' can lead to under- or over-tightening with serious consequences. Using a standard wrench without precise torque can lead to suspension failure, compromised alignment, and potential accidents. If you don't have a torque wrench, it's recommended to have a qualified technician perform the work. Some auto parts stores may also rent torque wrenches.

Q4

How often should I check the torque on my suspension bolts?

It's good practice to check suspension bolt torque after any suspension work has been done or components have been removed and reinstalled. If you frequently drive on rough roads, consider checking your suspension torque every 12 months or 10,000 miles. Regularly inspect your suspension components for signs of wear, such as loose bolts, unusual noises, or changes in handling. A pre-trip inspection before a track day is also essential.

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 for accurately applying torque to suspension bolts.

  • Click-type mechanism for precise torque application
  • Range of 20-200 Nm
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench for smaller suspension bolts and fasteners

  • Click-type mechanism for precise torque application
  • Range of 5-50 Nm
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various suspension bolt sizes.

  • Sizes ranging from 10mm to 24mm
  • Includes both standard and deep sockets
Learn more

Wrench Set (Metric)

A set of metric combination wrenches for holding nuts or access to tight areas.

  • Sizes ranging from 10mm to 24mm
  • Open and box end for different needs
Learn more

Hex Bit Socket Set

A set of hex bit sockets for accessing specific suspension fasteners

  • Sizes ranging from 6mm-10mm
  • For use with torque wrench or ratchet
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

Procedure for torquing the upper control arm bolts on the front suspension of a 2012-2015 Audi RS4.

  • Loosen, but do not remove, the wheel bolts
  • Raise the vehicle and secure with jack stands.
  • Remove the front wheel
  • Locate the front upper control arm bolts.
  • Using the appropriate socket and torque wrench, tighten the bolt connecting the control arm to the chassis to 70 Nm + 90 degrees.
  • Tighten the bolt that connects the arm to the spindle to 40 Nm + 90 degrees. Use a new nut
  • Repeat on the other side
  • Reinstall the front wheels, lower the car, and torque the wheel bolts to the vehicle specification.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

Procedure for torquing the lower control arm bolts on the front suspension of a 2012-2015 Audi RS4.

  • Loosen, but do not remove, the wheel bolts
  • Raise the vehicle and secure with jack stands.
  • Remove the front wheel
  • Locate the front lower control arm bolts.
  • Tighten the bolt connecting the control arm to the subframe to 70Nm + 90 degrees. Use a new nut
  • Tighten the bolt that connects the arm to the spindle to 70 Nm + 90 degrees. Use a new nut.
  • Repeat on the other side
  • Reinstall the front wheels, lower the car, and torque the wheel bolts to the vehicle specification.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

Procedure for torquing the upper control arm bolts on the rear suspension of a 2012-2015 Audi RS4.

  • Loosen, but do not remove, the wheel bolts
  • Raise the vehicle and secure with jack stands.
  • Remove the rear wheel
  • Locate the rear upper control arm bolts.
  • Using the appropriate socket and torque wrench, tighten the bolt connecting the control arm to the chassis to 70 Nm + 90 degrees.
  • Tighten the bolt that connects the arm to the spindle to 40 Nm + 90 degrees. Use a new nut
  • Repeat on the other side
  • Reinstall the rear wheels, lower the car, and torque the wheel bolts to the vehicle specification.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

Procedure for torquing the lower control arm bolts on the rear suspension of a 2012-2015 Audi RS4.

  • Loosen, but do not remove, the wheel bolts
  • Raise the vehicle and secure with jack stands.
  • Remove the rear wheel
  • Locate the rear lower control arm bolts.
  • Tighten the bolt connecting the control arm to the subframe to 70Nm + 90 degrees. Use a new nut
  • Tighten the bolt that connects the arm to the spindle to 70 Nm + 90 degrees. Use a new nut.
  • Repeat on the other side
  • Reinstall the rear wheels, lower the car, and torque the wheel bolts to the vehicle specification.
View full procedure

Rear Toe Link Bolt Torque Procedure

Procedure for torquing the rear toe link bolts on the suspension of a 2012-2015 Audi RS4

  • Loosen, but do not remove, the wheel bolts
  • Raise the vehicle and secure with jack stands
  • Remove the rear wheel
  • Locate the rear toe link bolts
  • Tighten the bolt connecting the toe link to the subframe to 70Nm + 90 degrees. Use a new nut.
  • Tighten the bolt that connects the link to the spindle to 70 Nm + 90 degrees. Use a new nut
  • Repeat on the other side
  • Reinstall the rear wheels, lower the car, and torque the wheel bolts to the vehicle specification.
View full procedure
Technical Service Bulletins

Suspension Noise and Creaking

2014-05-15

Some 2012-2015 Audi RS4 models may experience suspension noise or creaking, often caused by improperly torqued or worn control arm bolts.

2012-2015 Audi RS4

Resolution: Inspect all suspension bolts, replace worn components, and torque to the correct specifications (as shown in service procedures). Use new nuts for all control arm and link hardware.

Premature Control Arm Bushing Wear

2013-11-20

Premature wear of the suspension control arm bushings on the 2012-2015 Audi RS4 could be caused by improper installation or over torquing of the associated hardware

2012-2015 Audi RS4

Resolution: Inspect the control arm bushings for damage. Ensure all suspension bolts and nuts are torqued to the specification (as shown in service procedures). Replace bushings if damaged.

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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