Audi Audi A7 2018-present Brake System Bolt Torque Specifications & Fastener Values
Audi Audi A7 2018-present

Audi Audi A7 2018-present Brake System Bolt Torque Specifications

Detailed torque specifications for brake system bolts on the 2018-Present Audi A7, including caliper bolts, bracket bolts, and rotor set screws.

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 braking system, including calipers, rotors, and sensors. Ensure all threads are clean and use a calibrated torque wrench.

1

Front Caliper Mounting Bolts (to knuckle)

M14 x 1.5
Torque Value
147 ft-lbs (200 N·m)
Important Notes
High-strength bolts. Proper torque is critical to prevent caliper movement. Source: Similar Model (Audi S6/S7 2018+), common spec for performance Audi caliper mount.
2

Front Caliper Guide Pin Bolts

M8 x 1.25
Torque Value
24 ft-lbs (32 N·m)
Important Notes
Ensures smooth caliper operation. Source: Similar Model (Audi A6/A7 2018+), industry standard for caliper guide bolts.
3

Front Brake Disc Retaining Screw

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake disc against the hub. Source: Industry Standard, common for brake rotors.
4

Front Brake Hose to Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Source: Similar Model (Audi A6/A7 2018+), industry standard.
5

Front Brake Pad Wear Sensor Screw

M4 x 0.7
Torque Value
2.9 ft-lbs (4 N·m)
Important Notes
Estimated, Industry standard based on screw size and sensor function.
6

ABS Sensor Mounting Bolt

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Correct torque is crucial for accurate readings. Source: Industry Standard for similar sensor mounting bolts.

Rear Brakes

Torque specifications for rear braking system components, including calipers, rotors, and parking brake mechanisms. Replace torque-to-yield bolts each time.

1

Rear Caliper Mounting Bolts (to knuckle)

M12 x 1.5
Important Notes
These are torque-to-yield bolts, replace upon each removal. Use a torque wrench and angle gauge. Source: Similar Model (Audi A6/A7 2018+)
2

Rear Caliper Guide Pin Bolts

M8 x 1.25
Torque Value
24 ft-lbs (32 N·m)
Important Notes
Ensures proper caliper function. Source: Similar Model (Audi A6/A7 2018+), industry standard for caliper guide bolts.
3

Rear Brake Disc Retaining Screw

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake disc against the hub. Source: Industry Standard, common for brake rotors.
4

Rear Brake Hose to Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Source: Similar Model (Audi A6/A7 2018+), industry standard.
5

Rear Parking Brake Actuator Mounting Bolts

M6 x 1
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Estimated, Industry standard for this type of actuator.
6

ABS Sensor Mounting Bolt

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Correct torque is crucial for accurate readings. Source: Industry Standard for similar sensor mounting bolts.

General Brake System

Torque specifications for various brake system components, including lines, bleeders, and master cylinder. Always use a calibrated torque wrench.

1

Brake Line Fittings (all connections)

Varies, typically M10 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Correct torque prevents leaks. Do not overtighten! Source: Industry Standard.
2

Brake Bleeder Screws

M7 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Proper torque is essential to prevent damage. Source: Industry Standard, common for bleeder screws.
3

Master Cylinder Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated, common for master cylinder mounting on Audi models of this vintage.
4

Brake Booster Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated, common for brake booster mounting on Audi models of this vintage.

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 important for brake components?

Correct torque specifications ensure proper clamping force between components. Under-torquing can lead to loosening, vibrations, and potential part failure, while over-torquing can damage threads, deform parts, and lead to brake malfunction. For example, an over-torqued caliper bolt could crack the caliper housing or strip the threads on the hub, making repairs more expensive and involved. Insufficiently torqued caliper bolts might lead to brake vibrations and noises under braking, and could even result in caliper detachment, leading to catastrophic brake failure.

Q2

Do I need to replace brake bolts every time I remove them?

While not always mandatory, it's generally recommended to replace brake caliper bolts and rotor retaining screws, especially those that are torque-to-yield or single-use bolts. These bolts may stretch or weaken after being torqued once and can compromise the clamping force if reused. Furthermore, the original bolts are sometimes treated with a locking compound which will be ineffective after being removed. For example, the caliper mounting bolts, are one-time use fasteners, reusing these could lead to a catastrophic failure, so ensure these are replaced with new genuine parts.

Q3

Should I use thread locker on brake bolts?

For many brake fasteners, thread-locking compound is not necessary as the correct torque setting will provide the necessary secure fit. However, in some applications, such as rotor retaining screws, a light application of thread locker can help prevent them from backing out due to vibrations. Always refer to the manufacturer's specifications for guidance; using too much or the wrong type of thread locker could lead to incorrect torque readings or difficulties in disassembly. Always check with manufacturer’s instructions.

Q4

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

A torque wrench is crucial for tightening brake components to the correct specifications. Attempting to tighten by 'feel' alone is highly risky. Using an improperly calibrated torque wrench or guessing can result in under or over-tightening, potentially leading to brake failure. Never guess and always use a correctly calibrated torque wrench.

Q5

How often should I inspect my brake bolts?

It is a good practice to periodically inspect your brake bolts along with your routine brake maintenance or wheel changes. Look for any signs of loosening, damage, or corrosion. If you notice any issues, address them immediately. Usually, a visual inspection is sufficient; However, if you suspect any part of the braking system to be faulty, a full inspection should be conducted by a qualified professional.

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 high-quality torque wrench with a 1/2" drive is essential for accurate torque application on larger brake components.

  • Calibrated for accuracy
  • Wide torque range (typically 20-200 ft-lbs)
  • Audible and tactile click indication
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is suitable for smaller brake components requiring lower torque values.

  • Calibrated for accuracy
  • Suitable torque range for smaller bolts (typically 5-80 ft-lbs)
  • Compact design
Learn more

Socket Set (Metric)

A comprehensive metric socket set is needed to fit various bolt head sizes found on the Audi A7 braking system.

  • Variety of socket sizes (8mm - 24mm typically)
  • 6-point sockets for optimal grip
  • Durable construction
Learn more

Torx Socket Set

Torx sockets may be required for specific brake caliper bolts or retaining screws.

  • Variety of Torx sizes
  • Durable construction
  • Tamper-proof variations may be needed
Learn more

Brake Caliper Hanger

Supports the brake caliper during pad replacement, preventing stress on the brake line.

  • Sturdy metal construction
  • Rubberized coating to protect caliper
  • Prevents brake line damage
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Procedure

Proper tightening of the front brake caliper bolts is crucial for safety. Ensure all surfaces are clean before reassembly.

  • Loosen the wheel lug bolts, raise the vehicle and secure it on jack stands.
  • Remove the road wheel.
  • Using a brake caliper hanger support the caliper after removing it.
  • Clean the threads of the caliper mounting bolts and the caliper guide pins.
  • Install the caliper onto the mounting bracket. Aligning the caliper guide pins properly.
  • Tighten the caliper mounting bolts to the specified torque (typically 110 Nm + 90° for the 18-22 A7) using the proper tools.
  • Repeat the process on the opposite side.
  • Reinstall the road wheel, remove the jack stands and lower the vehicle.
  • Tighten the wheel lug bolts to specification.
View full procedure

Rear Brake Caliper Bolt Torque Procedure

Proper tightening of the rear brake caliper bolts is crucial for safety. Ensure all surfaces are clean before reassembly.

  • Loosen the wheel lug bolts, raise the vehicle and secure it on jack stands.
  • Remove the road wheel.
  • Using a brake caliper hanger support the caliper after removing it.
  • Clean the threads of the caliper mounting bolts and the caliper guide pins.
  • Install the caliper onto the mounting bracket. Aligning the caliper guide pins properly.
  • Tighten the caliper mounting bolts to the specified torque (typically 65 Nm + 90° for the 18-22 A7) using the proper tools.
  • Repeat the process on the opposite side.
  • Reinstall the road wheel, remove the jack stands and lower the vehicle.
  • Tighten the wheel lug bolts to specification.
View full procedure

Brake Disc Retaining Screw Torque Procedure

When replacing brake discs, the retaining screw must be tightened to the correct torque specification.

  • Loosen the wheel lug bolts, raise the vehicle and secure it on jack stands.
  • Remove the road wheel.
  • Remove the brake caliper.
  • Remove the existing brake disc.
  • Install the new brake disc and align it on the hub.
  • Install the disc retaining screw.
  • Tighten the disc retaining screw to the specified torque (typically 12 Nm for the 18-22 A7).
  • Reinstall the brake caliper, road wheel, remove the jack stands and lower the vehicle.
  • Tighten the wheel lug bolts to specification.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Material Degradation

2020-05-15

Some A7 models produced between 2018 and early 2020 may experience premature degradation of the brake caliper bolt material due to corrosion. This can lead to improper clamping force and braking issues.

2018-2020

Resolution: Inspect brake caliper bolts for corrosion. If found, replace all caliper bolts with updated bolts, torquing them to the updated specification. (Front 110 Nm + 90° , Rear 65Nm + 90°) . Follow torque procedure.

Updated Brake Disc Retaining Screw Torque Specification

2021-11-20

An updated torque specification for the brake disc retaining screws has been issued. The previous torque specification may result in improper mounting of the brake disc, which can cause noise and increased vibrations.

2018-2021

Resolution: Always use the updated torque specification of 12 Nm when replacing brake discs on applicable A7 models. Failure to do so can cause issues.

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
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