Audi Audi S6 2018-present Brake System Bolt Torque Specifications & Fastener Values
Audi Audi S6 2018-present

Audi Audi S6 2018-present Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2018-Present Audi S6 (C8/4K) including caliper bolts, rotor set screws, and other critical fasteners.

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 Brakes

Torque specifications for components of the front brake system, including calipers, rotors, and sensors.

1

Front Caliper Mounting Bolts

M14 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
High-strength bolts securing the caliper to the carrier. Crucial for clamping force. Source: Similar year/model and Industry standard.
2

Front Caliper Guide Pin Bolts

M10 x 1.25
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Secures the caliper guide pins. Proper torque ensures smooth caliper movement. Source: Similar year/model and Industry standard.
3

Front Brake Rotor Retaining Bolt

M8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the rotor in place during wheel assembly. Source: Industry Standard and Similar Year/Model.
4

Front Brake Hose to Caliper Fitting

Banjo Bolt, Size Varies
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the brake hose to the caliper. Critical for preventing leaks. Source: Industry standard for brake fittings with sealing washers.
5

Front ABS Wheel Speed Sensor Mounting Bolt

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor to the wheel hub. Source: Estimated based on similar sensor mounting bolts.
6

Front Brake Pad Retaining Pins or Screws

Varies
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Holds brake pads in place. Not torque critical, but secure. Source: Similar models and industry standard.

Rear Brakes

Torque specifications for components of the rear brake system, including calipers, rotors, parking brake, and sensors.

1

Rear Caliper Mounting Bolts

M12
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Secures the rear caliper to the carrier. Source: Similar year/model and Industry standard.
2

Rear Caliper Guide Pin Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the caliper guide pins. Proper torque ensures smooth caliper movement. Source: Similar year/model and Industry standard.
3

Rear Brake Rotor Retaining Bolt

M8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the rotor in place during wheel assembly. Source: Industry Standard and Similar Year/Model.
4

Rear Brake Hose to Caliper Fitting

Banjo Bolt, Size Varies
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the brake hose to the caliper. Critical for preventing leaks. Source: Industry standard for brake fittings with sealing washers.
5

Electronic Parking Brake (EPB) Motor Mounting Bolts

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Mounts the EPB motor. Estimated, based on similar motor mountings. Source: Estimated, based on similar motor mounting, M6 size bolt.
6

Rear ABS Wheel Speed Sensor Mounting Bolt

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the rear ABS sensor. Source: Estimated based on similar sensor mounting bolts.
7

Rear Brake Pad Retaining Pins or Screws

Varies
Torque Value
4 ft-lbs (5.5 N·m)
Important Notes
Holds rear brake pads in place. Not torque critical, but secure. Source: Similar models and industry standard.

Additional Components

Torque specifications for general brake system components like bleeder screws and master cylinder.

1

Brake Caliper Bleeder Screw

M7 or M8
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Used to bleed air. Do not over-tighten. Source: Industry standard for brake bleeder screws.
2

Brake Line Fittings (General)

M10 or M12
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Connects brake lines to components. Use a flare wrench. Estimated. Source: Industry standard, with slight variation based on fitting size.
3

Brake Master Cylinder Mounting Bolts

M8
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the master cylinder. Source: Estimated, typical for master cylinder of this size.

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 crucial for brake bolts?

Correct torque ensures proper clamping force. Under-torquing can lead to bolts loosening, causing brake failure, while over-torquing can damage the bolt or surrounding components, potentially causing premature wear or failure. For example, an over-torqued caliper bolt could crack the caliper housing.

Q2

What happens if I don't use a torque wrench when tightening brake bolts?

Without a torque wrench, it’s difficult to achieve accurate torque. You risk either under-tightening or over-tightening the bolts. Under-torqued bolts may vibrate loose, causing brake component separation, whereas over-torqued bolts can strip threads or deform parts, leading to expensive repairs and safety hazards.

Q3

Are the torque specs the same for front and rear brakes?

No, typically the torque specifications for front and rear brake components on an Audi S6 are different. For instance, caliper bracket bolts on the front brakes often require a higher torque than those on the rear due to the increased braking force on the front axle. Always refer to the specific service manual for the correct values for each location.

Q4

Should I use new bolts when replacing brake components?

It is highly recommended to use new bolts when replacing brake components, especially those that are torque-to-yield (TTY). These bolts stretch slightly when torqued, and reusing them can compromise the clamping force and lead to failure. Many brake component manufacturers recommend this practice.

Q5

Do I need to apply any lubricant to the brake bolts before tightening?

Generally, no lubricant should be applied to the threads of the bolts unless specified by the manufacturer, as this can affect the torque value and clamping force. However, if specified, use only the recommended anti-seize compound.

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 brake components. 1/2" drive is recommended for the torque ranges required.

  • Click-type mechanism
  • Range suitable for brake component torque specs (e.g., 20-150 ft-lbs)
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench is useful for smaller, lower-torque bolts in the braking system.

  • Click-type mechanism
  • Range suitable for lower torque brake components (e.g., 10-80 ft-lbs)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt heads in the braking system. Include sizes from 10mm to 21mm.

  • 6-point sockets
  • Deep and standard lengths
Learn more

Socket Set (Torx)

A set of torx sockets are needed for some of the bolts found in the brake assembly.

  • Torx sizes from T30 to T55
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Procedure

Procedure for correctly torquing the front brake caliper mounting bolts on a 2018-Present Audi S6.

  • Loosen the wheel bolts and remove the wheel.
  • Locate the caliper mounting bolts (usually two bolts).
  • Use the appropriate sized socket.
  • Tighten the caliper mounting bolts to 130 Nm (96 ft-lbs) plus an additional 90 degrees (1/4 turn) .
  • Reinstall the wheel and torque the wheel bolts to manufacturer specifications.
View full procedure

Rear Brake Caliper Bolt Torque Procedure

Procedure for correctly torquing the rear brake caliper mounting bolts on a 2018-Present Audi S6.

  • Loosen the wheel bolts and remove the wheel.
  • Locate the caliper mounting bolts (usually two bolts).
  • Use the appropriate sized socket.
  • Tighten the caliper mounting bolts to 65 Nm (48 ft-lbs).
  • Reinstall the wheel and torque the wheel bolts to manufacturer specifications.
View full procedure

Front Brake Rotor Retaining Screw Torque Procedure

Procedure for correctly torquing the front brake rotor retaining screw on a 2018-Present Audi S6.

  • Locate the rotor retaining screw.
  • Use the appropriate sized Torx socket.
  • Tighten the rotor retaining screw to 10 Nm (7 ft-lbs).
  • Ensure proper seating of the rotor.
View full procedure

Rear Brake Rotor Retaining Screw Torque Procedure

Procedure for correctly torquing the rear brake rotor retaining screw on a 2018-Present Audi S6.

  • Locate the rotor retaining screw.
  • Use the appropriate sized Torx socket.
  • Tighten the rotor retaining screw to 10 Nm (7 ft-lbs).
  • Ensure proper seating of the rotor.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Re-Use Advisory

2020-05-15

Advisory against re-using brake caliper bolts on 2018-2020 Audi S6 models due to potential material fatigue and stretching.

2018-2020

Resolution: Always replace caliper bolts with new ones from an authorized Audi dealer. Torque to specification.

Brake Rotor Retaining Screw Update

2021-03-10

A change in the front brake rotor retaining screw material has occurred, requiring a specific replacement part. This will affect the brake removal and install process.

2018-2021

Resolution: Use the updated retaining screw part number with the same torque specification and discard the old screw.

Brake Disc Runout Measurement Procedure

2022-11-22

New procedure for measurement of brake disc runout. Any brake disc exhibiting excessive runout should be replaced.

2018-2023

Resolution: Follow the updated procedure when inspecting the brake discs for excessive runout. Replacement is required if the brake disc is beyond runout tolerance.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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