Audi Audi TTS 2015-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi TTS 2015-present

Audi Audi TTS 2015-present Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for the 2015-Present Audi TTS. 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

Torque specifications for various components of the front suspension system on a 2015-Present Audi TTS, including struts, control arms, and sway bar components. These are critical for maintaining alignment and vehicle stability.

1

Strut-to-Knuckle Bolts

M14 x 1.5
Important Notes
These are torque-to-yield bolts. Always replace after removal. Critical for wheel alignment and overall suspension integrity.
2

Strut Mount-to-Body Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the top of the strut assembly to the vehicle's chassis. Ensure proper alignment before tightening.
3

Sway Bar Link-to-Strut Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar link to the strut assembly. Ensure the link is properly aligned before tightening.
4

Sway Bar Link-to-Sway Bar Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar link to the sway bar itself. Ensure the link is properly aligned before tightening.
5

Lower Control Arm Ball Joint to Knuckle Bolt

M12 x 1.5
Important Notes
Critical bolt securing the lower control arm to the knuckle. Always replace after removal. Ensure proper alignment before torquing.
6

Lower Control Arm Subframe Bolts

M12 x 1.75
Important Notes
Secures the lower control arm to the subframe. Ensure proper alignment before tightening. Always replace after removal.
7

Subframe-to-Chassis Bolts

M14 x 1.5
Important Notes
Safety-critical bolts securing the subframe to the chassis. Use a criss-cross or star pattern when tightening. Always replace after removal.
8

Brake Caliper Mounting Bolts (Front)

M14 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Safety-critical fasteners. Secure the brake caliper to the knuckle.

Rear Suspension

Torque specifications for various components of the rear suspension system on a 2015-Present Audi TTS, including struts, control arms, and sway bar components. These are critical for maintaining alignment and vehicle stability.

1

Strut-to-Knuckle Bolts

M14 x 1.5
Important Notes
These are torque-to-yield bolts. Always replace after removal. Ensure proper alignment before torquing.
2

Strut Mount-to-Body Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the top of the strut mount to the chassis. Ensure proper alignment before tightening.
3

Upper Control Arm-to-Body Bolt

M12 x 1.5
Important Notes
Secures the upper control arm to the chassis. Always replace after removal.
4

Upper Control Arm Ball Joint to Knuckle Bolt

M12 x 1.5
Important Notes
Secures the ball joint of the upper control arm to the rear knuckle. Always replace after removal.
5

Lower Control Arm-to-Knuckle Bolt

M12 x 1.5
Important Notes
Connects the lower control arm to the rear wheel bearing housing. Always replace after removal.
6

Lower Control Arm Subframe Bolts

M12 x 1.75
Important Notes
Secures the lower control arm to the subframe. Ensure proper alignment before tightening. Always replace after removal.
7

Subframe-to-Chassis Bolts

M14 x 1.5
Important Notes
Safety-critical bolts securing the subframe to the chassis. Use a criss-cross or star pattern when tightening. Always replace after removal.
8

Sway Bar Link-to-Control Arm Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar link to the rear control arm. Ensure proper alignment before tightening.
9

Sway Bar Link-to-Sway Bar Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar link to the sway bar. Ensure proper alignment before tightening.
10

Brake Caliper Mounting Bolts (Rear)

M12 x 1.75
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Safety-critical fasteners securing the brake caliper to the knuckle. Ensure proper alignment before tightening.

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?

Correct torque is crucial for maintaining proper suspension function, ensuring component longevity, and preventing failures. Over-tightening can damage bolts or components, while under-tightening can cause bolts to loosen, leading to instability and potentially dangerous situations. For example, improperly torqued control arm bolts can affect wheel alignment and steering responsiveness, while a loose shock absorber bolt can cause clunking noises and reduced handling performance.

Q2

What tools are needed to properly torque suspension bolts?

You will need a calibrated torque wrench (capable of measuring the required torque ranges), the correct size sockets and wrenches for the bolts, and potentially extensions or adapters for hard-to-reach fasteners. It is also good practice to have a set of new bolts on hand in case any are damaged during removal.

Q3

Should I use new bolts when working on the suspension?

It's highly recommended to use new bolts whenever possible, especially those that are specified as 'torque-to-yield' or 'stretch' bolts. These bolts are designed to deform slightly when tightened to their correct specification. Reusing them can result in inaccurate torque readings and compromised clamping force. Many suspension bolts fall into this category, especially those securing high-stress components.

Q4

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

After working on the suspension, a re-torque check is recommended after about 50-100 miles of driving. A good practice is also to include a visual inspection of the suspension bolts and components with your regular tire rotations or at least twice per year to catch any looseness or damage. For a track-driven vehicle, these checks should be much more frequent.

Q5

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

While you might be tempted to estimate using hand tools, it's very dangerous to assemble suspension components without a calibrated torque wrench. If you do not have one, it is better to take the vehicle to a qualified mechanic or reputable garage. Improperly torqued suspension components can lead to severe mechanical issues or accidents.

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 capable of accurately measuring torque values from 10 Nm to 200 Nm.

  • Ratchet mechanism for easy use
  • Click-type or digital display
  • Accurate within +/- 3%
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench capable of accurately measuring torque values from 5 Nm to 50 Nm.

  • Ratchet mechanism for easy use
  • Click-type or digital display
  • Accurate within +/- 3%
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including common sizes needed for suspension work (e.g., 13mm, 16mm, 18mm, 21mm).

  • 6-point design for secure grip
  • Various drive sizes (1/2" and 3/8")
  • Durable construction (chrome vanadium steel)
Learn more

Wrench Set (Metric)

A set of metric combination wrenches, including common sizes needed for suspension work (e.g., 13mm, 16mm, 18mm, 21mm).

  • Open-end and box-end design
  • Various sizes to fit all hardware
  • Durable construction (chrome vanadium steel)
Learn more

Ball Joint Separator

Tool designed to safely separate ball joints and tie rod ends without damaging the components.

  • Adjustable jaws to fit various joint sizes
  • Durable construction for long-lasting use
  • Reduces risk of damage to suspension components
Learn more

Triple Square Bit Set

A set of triple square bits in various sizes, including M8, M10, M12, M14, specifically for VW/Audi suspension hardware

  • Hardened steel for high torque applications
  • Precision machined to prevent slippage
  • Common sizes for Audi suspension work
Learn more
Service Procedures

Front Strut Assembly Removal and Installation

Detailed procedure for removing and installing the front strut assembly, including relevant torque specifications for fasteners.

  • Loosen lug nuts and raise the vehicle.
  • Remove the front wheel.
  • Disconnect ABS sensor and other lines from the strut.
  • Loosen and remove the top mount bolts from engine bay (Do not remove completely)
  • Use a jack to support the lower control arm and loosen lower mount bolt.
  • Remove the lower mount bolt and the top mount bolts.
  • Remove the front strut assembly from the vehicle.
  • Install the new strut assembly in the reverse order, adhering to torque specs.
View full procedure

Rear Shock Absorber Removal and Installation

Detailed procedure for removing and installing the rear shock absorbers, including relevant torque specifications for fasteners.

  • Loosen lug nuts and raise the vehicle.
  • Remove the rear wheel.
  • Access rear shock absorber through the wheel well or under the vehicle.
  • Remove the lower mounting bolts on the shock
  • Remove the upper mounting bolts on the shock.
  • Remove the rear shock assembly from the vehicle.
  • Install the new shock absorber in the reverse order, adhering to torque specs.
View full procedure

Control Arm Replacement

Detailed procedure for removing and installing the upper and lower control arms, including torque specifications.

  • Loosen lug nuts and raise the vehicle.
  • Remove the wheel.
  • Use a ball joint separator to separate the control arm.
  • Loosen and remove the control arm mounting bolts.
  • Remove the control arm from the vehicle.
  • Install the new control arm in reverse order, adhering to torque specs.
View full procedure
Technical Service Bulletins

Suspension Bolt Corrosion Issues

2018-05-15

Technical bulletin addressing premature corrosion of suspension bolts, particularly in regions with heavy road salt usage. This can affect the torque specifications.

2015-2018 Audi TTS

Resolution: Replace corroded bolts with updated, coated hardware. Use anti-seize compound during reassembly. Confirm torque specification are within spec.

Updated Torque Specifications for Lower Control Arm Bolts

2020-01-10

Technical bulletin outlining revised torque specifications for lower control arm bolts due to instances of loosening. Please adhere to new torque specifications.

2015-2020 Audi TTS

Resolution: Ensure the lower control arm bolts are torqued to the new, revised specifications. Refer to the provided torque specification sheet.

Rear Suspension Creaking Noise

2022-08-20

Technical bulletin addressing creaking noise originating from the rear suspension during turns or over bumps. May be related to incorrect torque values.

2015-2022 Audi TTS

Resolution: Inspect rear suspension components, especially the sway bar links and shock absorber mounts. Ensure correct torque is applied to all bolts. Replace any worn components.

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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