Audi Audi S3 2013-present Brake System Bolt Torque Specifications & Fastener Values
Audi Audi S3 2013-present

Audi Audi S3 2013-present Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2013-Present Audi S3, including caliper bolts, carrier bolts, and rotor retaining screws. Covers both 8V and 8Y generations.

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 the front brake components of a 2013-Present Audi S3. Includes caliper mounting, guide pins, rotor set screw, and other related parts. Always consult with an official service manual specific to your vehicle's model year and trim when performing work.

1

Front Brake Caliper Mounting Bolts

M14 x 1.5
Torque Value
103 ft-lbs (140 N·m)
Important Notes
Secures the brake caliper to the wheel bearing housing/steering knuckle. Critical for safety. Torque to spec.
2

Front Brake Caliper Guide Pin Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the caliper guide pins, allowing the caliper to slide smoothly. Proper torque is essential for even pad wear.
3

Front Brake Rotor Set Screw

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake rotor in place during wheel installation. Not a load-bearing screw.
4

Front Brake Hose to Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the brake hose to the caliper. Always use new crush washers. Torque to spec. Estimated value.
5

Front Wheel Speed Sensor Bolt

M6 x 1.0
Torque Value
71 in-lbs (8 N·m)
Important Notes
Secures the wheel speed sensor to the steering knuckle/bearing carrier. Torque to spec. Estimated value.
6

Front Brake Pad Wear Sensor Clip Bolt/Screw

M4 x 0.7
Torque Value
18 in-lbs (2 N·m)
Important Notes
Holds the wear sensor clip in place. Torque to spec. Estimated value.

Rear Brakes

Torque specifications for the rear brake components of a 2013-Present Audi S3. Includes caliper mounting, guide pins, rotor set screw, and related parts. Always consult with an official service manual specific to your vehicle's model year and trim when performing work.

1

Rear Brake Caliper Mounting Bolts

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Secures the rear brake caliper to the axle carrier/rear suspension knuckle. Critical for safety. Torque to spec.
2

Rear Brake Caliper Guide Pin Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the caliper guide pins, allowing the caliper to slide smoothly. Proper torque is essential for even pad wear.
3

Rear Brake Rotor Set Screw

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake rotor in place during wheel installation. Not a load-bearing screw.
4

Rear Brake Hose to Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the brake hose to the caliper. Always use new crush washers. Torque to spec. Estimated value.
5

Rear Parking Brake Cable Bracket Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Holds the parking brake cable bracket. Torque to spec. Estimated value.
6

Rear Wheel Speed Sensor Bolt

M6 x 1.0
Torque Value
71 in-lbs (8 N·m)
Important Notes
Secures the wheel speed sensor to the axle carrier. Torque to spec. Estimated value.
7

Rear Brake Pad Wear Sensor Clip Bolt/Screw

M4 x 0.7
Torque Value
18 in-lbs (2 N·m)
Important Notes
Holds the wear sensor clip in place. Torque to spec. Estimated value.

Other Brake Components

Torque specifications for other brake system components including master cylinder, brake booster, and related parts of a 2013-Present Audi S3. Always consult with an official service manual specific to your vehicle's model year and trim when performing work.

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the master cylinder to the brake booster/firewall. Torque to spec. Estimated value.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the brake booster to the firewall. Critical for proper brake operation. Torque to spec. Estimated value.
3

Brake Line Fittings (Hard Line to Flexible Hose)

10-12mm Threads (estimated)
Torque Value
13 ft-lbs (18 N·m)
Important Notes
Connects hard brake lines to flexible hoses. Use a flare nut wrench to prevent rounding the fitting. Torque is an average for this type of fitting, use a torque spec that is appropriate for the given size. Use new fittings if reusing is not recommended per manufacturer.
4

Brake Caliper Bleeder Screw

M7-M10 (estimated)
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Used during bleeding process, proper torque prevents leakage and damage. Torque is an average value for a bleeder screw. Estimated value.
5

Brake Pedal Assembly Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the brake pedal assembly. Important for brake pedal stability. Torque to spec. 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

Why is using the correct torque specification so important for brake components?

Using the correct torque specifications for brake components is crucial for safety and proper function. Over-tightening can damage threads, warp rotors, and cause premature failure, while under-tightening can lead to loose bolts, component movement, and brake failure. For example, an under-torqued caliper bolt could lead to brake instability and loss of braking power, while an overtightened bolt could crack the caliper housing.

Q2

Where can I find the correct torque specifications for my specific 2013-Present Audi S3 brake components?

The most reliable source for torque specifications is your vehicle's repair manual or a reputable online database specific to your vehicle. Information is also sometimes available through forums, however, be sure to cross-reference any information against the official sources. Torque specs may differ depending on the exact model and brake configuration.

Q3

Should I use anti-seize on brake caliper bolts?

Generally, it's not recommended to use anti-seize on brake caliper bolts unless specifically called for in your service manual. Anti-seize can affect the bolt's friction, thus influencing the accuracy of your torque value. If the manufacturer calls for lubrication or a particular type of thread-locking compound, adhere to those specifications. Some bolts have pre-applied thread-locking material. Clean and inspect the bolt threads. If you choose to use anti-seize, then reduce torque values by 10-15%, and retorque every 500 miles to ensure the bolts are securely installed and are not backing out.

Q4

What type of tool is required to torque brake components?

A calibrated torque wrench is essential for tightening brake components to the correct specification. Using a regular wrench and guessing the torque is not safe. A torque wrench will give you accurate readings. Always use the correct size socket to match the head of the bolt or nut you are tightening. Make sure your torque wrench is calibrated every year or two and check the calibration frequently if you use it daily. This can be done at most automotive tool suppliers.

Q5

Do I need to replace bolts after removing them during brake work?

While not always required, it's generally recommended to replace torque-to-yield (TTY) bolts, which stretch when torqued, as they may not clamp as expected when reused. In some cases, manufacturer manuals also specify replacing brake caliper bolts after each use because of the potential for material fatigue. Always check the service manual to confirm whether you need to replace your bolts before installing them.

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 to manufacturer specifications.

  • Measures torque in Newton-meters (Nm) or foot-pounds (ft-lbs)
  • Click-type mechanism indicates when the desired torque is reached
Learn more

Torque Wrench (3/8" Drive)

A smaller drive torque wrench for smaller fasteners such as bleeder screws

  • Measures torque in Newton-meters (Nm)
  • Smaller footprint for working in tight areas
Learn more

Socket Set (Metric)

A comprehensive socket set with various metric sizes to fit all bolts on the brake system.

  • Includes sizes ranging from 8mm to 21mm (and potentially larger)
  • Impact-rated sockets recommended
Learn more

Brake Caliper Hanger

Used to support brake caliper when removing it from the vehicle to avoid damage to the brake line.

  • Hangs securely from the suspension
  • Prevents strain on brake hoses
Learn more
Service Procedures

Front Brake Caliper Bracket Bolt Torque

Procedure for tightening the front brake caliper bracket bolts to the correct specification.

  • Locate the front brake caliper bracket bolts (typically two per caliper).
  • Clean any debris from the threads of the bolts.
  • Using the correct size socket and torque wrench, tighten the bolts to 120 Nm + 90 degree turn, replacing each bolt after its removed.
  • Verify torque settings after tightening.
  • Reinstall wheel.
View full procedure

Front Brake Caliper Guide Pin Bolt Torque

Procedure for tightening the front brake caliper guide pin bolts.

  • Locate the front brake caliper guide pin bolts.
  • Clean any debris from the threads of the bolts.
  • Using the correct size socket and torque wrench, tighten the guide pin bolts to 35 Nm
  • Verify torque settings after tightening.
View full procedure

Rear Brake Caliper Bracket Bolt Torque

Procedure for tightening the rear brake caliper bracket bolts.

  • Locate the rear brake caliper bracket bolts (typically two per caliper).
  • Clean any debris from the threads of the bolts.
  • Using the correct size socket and torque wrench, tighten the bolts to 90 Nm + 90 degree turn, replacing each bolt after its removed.
  • Verify torque settings after tightening.
  • Reinstall wheel.
View full procedure

Rear Brake Caliper Guide Pin Bolt Torque

Procedure for tightening the rear brake caliper guide pin bolts.

  • Locate the rear brake caliper guide pin bolts.
  • Clean any debris from the threads of the bolts.
  • Using the correct size socket and torque wrench, tighten the guide pin bolts to 30 Nm.
  • Verify torque settings after tightening.
View full procedure

Brake Rotor Set Screw Torque

Procedure for tightening the brake rotor set screw

  • Locate the brake rotor set screw.
  • Using the correct size tool and torque wrench tighten the bolt to 10 Nm
  • Verify torque settings after tightening.
View full procedure

Brake Bleeder Screw Torque

Procedure for tightening the brake bleeder screws.

  • Locate the brake bleeder screws.
  • Using the correct size tool and torque wrench tighten the bolts to 10 Nm
  • Verify torque settings after tightening.
View full procedure
Technical Service Bulletins

Revised Torque Spec for Front Caliper Bracket Bolts

2018-06-15

A bulletin was issued regarding a revised torque specification for the front caliper bracket bolts to prevent potential loosening. This is not present in all models.

2013-2016 S3

Resolution: Torque to 120 Nm + 90 degree turn. Always replace these bolts.

Caliper Guide Pin Bolt Inspection

2021-03-01

A bulletin was issued concerning inspection of guide pin bolts for corrosion, and to ensure proper function

2013-2020 S3

Resolution: Inspect and replace guide pin bolts that are damaged, clean and regrease as needed, always torque to spec, replace any hardware that has been used more than twice.

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
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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