Audi Audi RS4 2018-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2018-present

Audi Audi RS4 2018-present Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for 2018-Present Audi RS4 models (B9 and B9.5). Includes detailed torque values for various 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

Components and torque specifications for the front suspension system, including control arms, struts, and sway bar links.

1

Upper Control Arm to Chassis Bolt (Front)

M12 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Crucial for suspension geometry. Estimated value based on similar Audi models.
2

Upper Control Arm to Ball Joint Bolt (Front)

M10 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Ensures joint stability and steering precision. Estimated value based on similar Audi models.
3

Lower Control Arm to Chassis Bolt (Front)

M14 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Critical for suspension strength. Estimated value based on similar Audi models.
4

Lower Control Arm Ball Joint Nut (Front)

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures ball joint to the wheel carrier. Estimated value based on similar Audi models.
5

Wheel Hub/Carrier to Strut Bolt (Front)

M14 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. This bolt is under high stress. Estimated value based on similar Audi models.
6

Sway Bar End Link Nut (Front, at sway bar)

M10 x 1.25
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Connects the sway bar to the suspension. Estimated value based on similar Audi models.
7

Sway Bar End Link Nut (Front, at strut)

M10 x 1.25
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Connects the sway bar to the suspension. Estimated value based on similar Audi models.
8

Strut Mount to Chassis Bolt (Front)

M8 x 1.25
Important Notes
Torque-to-yield bolt. Replace after removal. Usually 3 bolts. Tighten in a star pattern. Estimated value based on similar Audi models.
9

Brake Caliper Mounting Bolts (Front)

M14 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Secures the brake caliper. Ensure proper and even torque application. Estimated value based on similar Audi models.
10

Brake Rotor Set Screw (Front)

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Temporarily secures the rotor during wheel removal/installation. Industry standard.

Rear Suspension

Components and torque specifications for the rear suspension system, including control arms, struts, and sway bar links.

1

Upper Control Arm to Chassis Bolt (Rear)

M12 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Affects camber. Estimated value based on similar Audi models.
2

Upper Control Arm to Wheel Carrier Bolt (Rear)

M10 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the upper control arm to the wheel carrier. Estimated value based on similar Audi models.
3

Lower Control Arm to Chassis Bolt (Rear)

M14 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Handles cornering and acceleration forces. Estimated value based on similar Audi models.
4

Lower Control Arm to Wheel Carrier Bolt (Rear)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Connects the lower control arm to the wheel carrier. Estimated value based on similar Audi models.
5

Toe Control Arm to Chassis Bolt (Rear)

M12 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Controls toe adjustment. Estimated value based on similar Audi models.
6

Toe Control Arm to Wheel Carrier Bolt (Rear)

M10 x 1.25
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects toe control arm to the wheel carrier. Estimated value based on similar Audi models.
7

Trailing Arm to Chassis Bolt (Rear)

M14 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Controls longitudinal wheel movement. Estimated value based on similar Audi models.
8

Trailing Arm to Wheel Carrier Bolt (Rear)

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Connects the trailing arm to the wheel carrier. Estimated value based on similar Audi models.
9

Wheel Hub/Carrier to Strut Bolt (Rear)

M14 x 1.5
Important Notes
Torque-to-yield bolt. Replace after removal. Important for rear suspension stability. Estimated value based on similar Audi models.
10

Sway Bar End Link Nut (Rear, at sway bar)

M10 x 1.25
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Connects sway bar to the suspension. 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 is it important to torque suspension bolts to the specified values?

Proper torque ensures the bolts are tight enough to maintain component integrity and prevent loosening during driving, but not so tight that they damage the bolt or the surrounding materials. Under-torqued bolts can lead to suspension component failure, instability, and noise, while over-torquing can cause bolt stretching, thread damage, or component cracking. This is critical for the RS4's performance-oriented suspension.

Q2

What happens if I over-torque a suspension bolt?

Over-torquing can lead to several problems. The bolt itself may stretch beyond its yield point, weakening its structural integrity. The threads on the bolt or in the receiving component may become damaged (stripped). The excessive force can also damage or distort the components being held together, potentially causing premature wear or failure. For instance, over-tightening a control arm bolt could warp the bushing and lead to premature failure. It's vital to always use a calibrated torque wrench.

Q3

What happens if I under-torque a suspension bolt?

Under-torquing is equally dangerous. Insufficient clamping force can allow the bolt to loosen over time due to vibrations and thermal expansion. This can lead to play in the suspension, creating knocking noises, and ultimately result in component failure. Loose suspension components can cause instability and make the vehicle difficult to control, especially at high speeds or during cornering. For example, under-torqued strut bolts could shift and negatively impact wheel alignment.

Q4

Should I reuse the suspension bolts after removal?

Generally, it is not recommended to reuse torque-to-yield (TTY) bolts, which are common in modern suspension systems like the RS4. TTY bolts are designed to stretch slightly when torqued, and reusing them could lead to unpredictable clamping force and potential failure. Many fasteners on the RS4 suspension are TTY. If unsure, always consult the Audi workshop manual. Even if not TTY, it's good practice to replace fasteners which may have corrosion or damage.

Q5

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

While no specific timeline can be given, it's good practice to check the torque of suspension components following any work done on the system. Additionally, if you experience unusual noises or changes in vehicle handling, a check of torque is warranted. Regular checks can be performed as part of annual service. Furthermore, after the vehicle has been put through severe usage (track days, heavy impacts etc.), it is wise to check torque specifications of the system components.

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 torque.

  • Wide torque range
  • Audible click indication
  • Calibration certificate recommended
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is useful for smaller bolts and less accessible areas.

  • Lower torque range
  • Suitable for smaller fasteners
  • Audible click indication
Learn more

Socket Set (Metric)

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

  • Variety of sizes
  • 6-point sockets preferred
  • Durable construction
Learn more

Hex/Allen Key Set (Metric)

Metric hex keys may be needed for specific suspension bolts or fasteners.

  • Variety of sizes
  • Ball-end hex keys recommended
  • Durable construction
Learn more

Breaker Bar

A breaker bar provides extra leverage for loosening stubborn bolts before applying torque.

  • Long handle
  • Durable construction
  • Strong leverage
Learn more

Pry Bar

A pry bar can be helpful for aligning suspension components during installation.

  • Various sizes available
  • Durable construction
  • Forged steel
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

Detailed steps for torquing the front upper control arm bolts on a 2018-Present Audi RS4.

  • 1. Locate the front upper control arm mounting bolts.
  • 2. Loosely install the bolts and ensure the control arm is aligned correctly.
  • 3. Using the specified torque wrench, torque the bolt to 70Nm + 90 degrees
  • 4. Repeat for all front upper control arm bolts.
  • 5. Double check torque specifications.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

Detailed steps for torquing the front lower control arm bolts on a 2018-Present Audi RS4.

  • 1. Locate the front lower control arm mounting bolts.
  • 2. Loosely install the bolts and ensure the control arm is aligned correctly.
  • 3. Using the specified torque wrench, torque the bolt to 100Nm + 90 degrees.
  • 4. Repeat for all front lower control arm bolts.
  • 5. Double check torque specifications.
View full procedure

Front Strut/Shock Mounting Bolt Torque Procedure

Detailed steps for torquing the front strut/shock mounting bolts on a 2018-Present Audi RS4.

  • 1. Locate the front strut/shock mounting bolts (lower and upper).
  • 2. Loosely install the bolts and ensure the strut is aligned correctly.
  • 3. Using the specified torque wrench, torque the lower mounting bolts to 80Nm + 90 degrees.
  • 4. Using the specified torque wrench, torque the upper mounting bolts to 40Nm + 90 degrees
  • 5. Repeat for all strut mounting bolts.
  • 6. Double check torque specifications.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

Detailed steps for torquing the rear upper control arm bolts on a 2018-Present Audi RS4.

  • 1. Locate the rear upper control arm mounting bolts.
  • 2. Loosely install the bolts and ensure the control arm is aligned correctly.
  • 3. Using the specified torque wrench, torque the bolt to 70Nm + 90 degrees
  • 4. Repeat for all rear upper control arm bolts.
  • 5. Double check torque specifications.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

Detailed steps for torquing the rear lower control arm bolts on a 2018-Present Audi RS4.

  • 1. Locate the rear lower control arm mounting bolts.
  • 2. Loosely install the bolts and ensure the control arm is aligned correctly.
  • 3. Using the specified torque wrench, torque the bolt to 100Nm + 90 degrees.
  • 4. Repeat for all rear lower control arm bolts.
  • 5. Double check torque specifications.
View full procedure

Rear Shock/Strut Mounting Bolt Torque Procedure

Detailed steps for torquing the rear shock/strut mounting bolts on a 2018-Present Audi RS4.

  • 1. Locate the rear strut/shock mounting bolts (lower and upper).
  • 2. Loosely install the bolts and ensure the strut is aligned correctly.
  • 3. Using the specified torque wrench, torque the lower mounting bolts to 80Nm + 90 degrees.
  • 4. Using the specified torque wrench, torque the upper mounting bolts to 40Nm + 90 degrees
  • 5. Repeat for all strut mounting bolts.
  • 6. Double check torque specifications.
View full procedure
Technical Service Bulletins

Suspension Bolt Re-Torque Recommendation After Alignment

2020-05-15

It is recommended to re-torque all suspension bolts after performing a wheel alignment to ensure proper torque and prevent issues.

2018-2020 Audi RS4

Resolution: After completing a wheel alignment, re-torque all suspension bolts to the specifications provided in the service manual.

Service Action - Front Lower Control Arm Bolt Inspection

2021-11-20

Inspect the front lower control arm bolts for any signs of damage or loosening. Replace if necessary and re-torque to specification.

2018-2021 Audi RS4

Resolution: Inspect the front lower control arm bolts for signs of loosening or damage and torque to proper specifications after replacement.

Updated Torque Specifications for Rear Suspension Components

2022-03-10

Revised torque specifications for specific rear suspension bolts due to updated engineering guidelines.

2018-2022 Audi RS4

Resolution: Apply updated torque specifications to the rear upper and lower control arm bolts. See service manual for details.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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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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