Audi Audi S7 2012-2018 Brake System Bolt Torque Specifications & Fastener Values
Audi Audi S7 2012-2018

Audi Audi S7 2012-2018 Brake System Bolt Torque Specifications

This page provides detailed torque specifications for various brake bolts on the 2012-2018 Audi S7 (C7) model, including caliper bolts, rotor bolts, and related hardware.

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 Brake Calipers

Torque specifications for the front brake caliper assembly components, including guide pins and mounting bolts.

1

Front Caliper Guide Pin Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the brake caliper to the caliper carrier. Proper torque is critical for even pad wear, effective braking, and preventing caliper binding.
2

Front Caliper Mounting Bolts (to Spindle)

M14 x 1.5
Torque Value
133 ft-lbs (180 N·m)
Important Notes
Secures the caliper carrier to the wheel spindle. Critical for safety; ensure the caliper is firmly fixed.
3

Front Brake Line Banjo Bolt (Caliper)

M10 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the brake line to the caliper, ensuring a leak-free connection.

Front Brake Rotors

Specifications for front brake rotor components.

1

Front Brake Rotor Retaining Screw

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake rotor in place during wheel removal and installation, not critical for braking performance.

Front Brake Pads

Specifications for front brake pad wear sensor mounting components.

1

Front Brake Pad Wear Sensor Mounting Screw

M4 x 0.7
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Secures the wear sensor. Important to prevent sensor from moving and causing false readings. Estimated value.

Rear Brake Calipers

Torque specifications for the rear brake caliper assembly components, including guide pins and mounting bolts.

1

Rear Caliper Guide Pin Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensures the rear caliper moves smoothly. Essential for even pad wear and consistent braking.
2

Rear Caliper Mounting Bolts (to Spindle)

M12 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Secure the rear caliper carrier to the rear spindle. Safety-critical bolts, tighten to correct spec.
3

Rear Brake Line Banjo Bolt (Caliper)

M10 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the brake line to the rear caliper, ensuring a leak-free connection.

Rear Brake Rotors

Specifications for rear brake rotor components.

1

Rear Brake Rotor Retaining Screw

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake rotor in place during wheel removal and installation, not critical for braking performance.

Rear Brake Pads

Specifications for rear brake pad wear sensor mounting components.

1

Rear Brake Pad Wear Sensor Mounting Screw

M4 x 0.7
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Secures the wear sensor. Important to prevent sensor from moving and causing false readings. Estimated value.

Master Cylinder

Torque specifications for components related to the brake master cylinder.

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Holds the master cylinder to the brake booster. Correct torque is needed to prevent movement and leaks. Estimated value.

Brake Booster

Torque specifications for the brake booster mounting bolts.

1

Brake Booster Mounting Bolts (to Firewall)

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the brake booster to the vehicle firewall. Correct torque is needed for a stable and reliable pedal feel. Estimated value.

Brake Lines

Torque specifications for brake line fittings at the master cylinder and proportioning valve.

1

Brake Line Fittings (at master cylinder and proportioning valve)

Varies, typically M10x1.0 or M12x1.0
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Connects the brake lines to the master cylinder and other components. Proper torque ensures leak-free connections. Estimated based on industry standard for brake line fittings.

Abs Module

Torque specifications for the ABS module mounting bolts.

1

ABS Module Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13.5 N·m)
Important Notes
Secures the ABS module. Proper torque is important for mounting and function of the module. Estimated value.

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

What are the typical torque specifications for brake caliper bolts on a 2012-2018 Audi S7?

Front caliper carrier bolts typically require 200 Nm + 90 degrees. Rear caliper carrier bolts typically require 175 Nm + 90 degrees. Caliper guide pins vary but are generally between 25-35 Nm. Always consult your vehicle specific repair manual for the exact specification as values can change based on specific component.

Q2

Why is it crucial to follow torque specifications when working on brake components?

Correct torque is essential for safety and performance. Under-torquing can lead to components loosening, causing brake failure. Over-torquing can damage threads, distort components, or cause premature failure. Proper torque ensures the correct clamping force, preventing issues like brake squeal, uneven pad wear, and reduced braking performance.

Q3

Should I use new bolts when reassembling the brake calipers?

It is highly recommended to use new bolts, especially the caliper carrier bolts which are 'torque-to-yield' bolts. These bolts stretch slightly when torqued and should not be reused. Reusing these bolts can result in improper clamping force and potential failure. Always replace any self-locking or one-time-use bolts as well.

Q4

What happens if I don't tighten the bolts to the correct specification?

Under-tightened bolts can lead to movement of the brake components, causing uneven wear on brake pads and rotors, leading to premature brake failure. Over-tightened bolts can stretch or break, causing the bolts to fail or damage other components. This can also cause issues with alignment and rotor runout.

Q5

Where can I find the correct torque specifications for my Audi S7 brake system?

The best resource for accurate torque specifications is the official repair manual for your specific model year and drivetrain configuration. Online resources, like forums, can be helpful, but always double-check information with your manual as specifications can vary. Many of the subscription repair manual services like alldata and Mitchell1 also have this information.

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 brake components to the manufacturer's specifications.

  • 10-150 ft-lb range
  • Click-type mechanism for accurate torque application
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench, often needed for smaller bolts in the brake system.

  • 5-80 ft-lb range
  • Click-type mechanism for accurate torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolt sizes on the brake components.

  • Sizes from 10mm to 21mm
  • 6-point sockets preferred for better grip
Learn more

Brake Caliper Hanger

Used to support the brake caliper during pad replacement to prevent stress on the brake line.

  • Sturdy metal construction
  • Coated to prevent scratching of parts
Learn more
Service Procedures

Front Brake Caliper Removal and Installation

This procedure outlines the steps to properly remove and reinstall the front brake calipers, ensuring correct torque specifications are met for safe operation.

  • Loosen wheel lugs and lift vehicle.
  • Remove wheel.
  • Use caliper hanger to support the caliper after removing the retaining bolts
  • Disconnect brake pad wear sensor (if applicable)
  • Remove caliper mounting bolts. Note their locations.
  • Clean mating surfaces on caliper and wheel hub.
  • Reinstall the caliper and new mounting bolts using the specified torque. Refer to the torque specifications below for the correct values. Torque the bolts in a star pattern
  • Reconnect sensor
  • Reinstall wheel. Torque wheel lugs.
  • Lower vehicle and re-torque wheel lugs to specified value
View full procedure

Rear Brake Caliper Removal and Installation

This procedure outlines the steps to properly remove and reinstall the rear brake calipers, ensuring correct torque specifications are met for safe operation.

  • Loosen wheel lugs and lift vehicle.
  • Remove wheel.
  • Use caliper hanger to support the caliper after removing the retaining bolts
  • Disconnect brake pad wear sensor (if applicable)
  • Remove caliper mounting bolts. Note their locations.
  • Clean mating surfaces on caliper and wheel hub.
  • Reinstall the caliper and new mounting bolts using the specified torque. Refer to the torque specifications below for the correct values. Torque the bolts in a star pattern
  • Reconnect sensor
  • Reinstall wheel. Torque wheel lugs.
  • Lower vehicle and re-torque wheel lugs to specified value
View full procedure

Brake Rotor Replacement

This procedure guides the proper removal and reinstallation of brake rotors. Pay close attention to cleaning and aligning the rotor on the hub.

  • Follow the brake caliper removal steps above
  • Remove the rotor retaining screw (if equipped).
  • Remove the brake rotor.
  • Clean the hub surface thoroughly. Wire brush or similar cleaning tools may be used.
  • Install the new rotor, making sure it sits flush and is properly aligned.
  • Install rotor retaining screw (if equipped)
  • Follow the caliper installation procedure above.
  • Bed in new pads and rotors according to manufacturer instructions.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Corrosion

2016-05-12

Report of corrosion found on the brake caliper bolts, especially in areas with harsh winter conditions or high humidity. Can lead to seized bolts and difficulty during service

2012-2016 Audi S7

Resolution: Use new bolts during all brake services. Apply anti-seize to threads and torque to spec. Check bolt condition during seasonal inspections.

Brake Rotor Runout Issues

2017-11-20

Technical bulletin addressing issues of excessive brake rotor runout that can cause vibration and premature wear of brake components. Improper torquing can cause this runout.

2012-2018 Audi S7

Resolution: Use a dial indicator to verify rotor runout. Ensure proper seating on hub before tightening to torque specification. Clean all mating surfaces prior to installation.

Brake Pad Wear Sensor Failure

2019-02-28

Report of premature failure of brake pad wear sensors, often due to road debris damage or corrosion of electrical connection. Always disconnect and inspect connectors during any brake service.

2015-2018 Audi S7

Resolution: Replace wear sensor if damaged, inspect connectors for corrosion. Ensure the sensor is properly seated during installation.

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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