Audi Audi S4 2009-2016 Brake System Bolt Torque Specifications & Fastener Values
Audi Audi S4 2009-2016

Audi Audi S4 2009-2016 Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2009-2016 Audi S4 (B8 and B8.5 platforms). Includes caliper bolts, rotor bolts, and other relevant 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 Brakes

Torque specifications for components of the front brake system on a 2009-2016 Audi S4 (B8/B8.5 chassis). Includes caliper, carrier, rotor, and sensor components.

1

Front Caliper Mounting Bolts (to Carrier)

M14 x 1.5
Torque Value
103 ft-lbs (140 N·m)
Important Notes
Ensure proper clamping force to prevent caliper movement. Always use a calibrated torque wrench.
2

Front Caliper Carrier Bolts (to Hub/Knuckle)

M14 x 1.5
Torque Value
140 ft-lbs (190 N·m)
Important Notes
Tighten in a cross pattern. Ensure proper seating of the carrier against the hub/knuckle before final torque.
3

Brake Rotor Retaining Screw

M6 x 1.0
Torque Value
0.59 ft-lbs (8 N·m)
Important Notes
This screw holds the rotor in place during wheel installation. Do not over tighten.
4

Brake Hose to Caliper Banjo Bolt

M10 x 1.0 or M10 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Use new crush washers. Ensure no fluid leaks after tightening. Check torque after test drive.
5

Brake Hose to Chassis Bracket Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the brake hose is properly secured to the bracket.
6

Brake Pad Wear Sensor Clip Screw

M4 x 0.7
Torque Value
0.18 ft-lbs (2.5 N·m)
Important Notes
Estimated value. Do not overtighten, as this bolt is small and threads easily.
7

ABS Sensor Bolt (Wheel speed sensor)

M6 x 1.0
Torque Value
0.59 ft-lbs (8 N·m)
Important Notes
Ensure the sensor is properly seated before tightening. Do not over tighten.

Rear Brakes

Torque specifications for components of the rear brake system on a 2009-2016 Audi S4 (B8/B8.5 chassis). Includes caliper, carrier, rotor, parking brake, and sensor components.

1

Rear Caliper Mounting Bolts (to Carrier)

M10 x 1.5 or M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Ensure proper clamping force to prevent caliper movement. Always use a calibrated torque wrench.
2

Rear Caliper Carrier Bolts (to Hub/Knuckle)

M12 x 1.5
Important Notes
Always replace these bolts. Tighten to torque specification, then turn an additional 90 degrees.
3

Rear Brake Rotor Retaining Screw

M6 x 1.0
Torque Value
0.59 ft-lbs (8 N·m)
Important Notes
This screw holds the rotor in place during wheel installation. Do not over tighten.
4

Rear Brake Hose to Caliper Banjo Bolt

M10 x 1.0 or M10 x 1.25
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Use new crush washers. Ensure no fluid leaks after tightening.
5

Rear Brake Hose to Chassis Bracket Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the brake hose is properly secured to the bracket.
6

Parking Brake Actuator Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure the actuator is properly seated. Estimated value based on similar components.
7

Parking Brake Cable Bracket Bolt

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the cable bracket is properly secured.
8

ABS Sensor Bolt (Wheel speed sensor)

M6 x 1.0
Torque Value
0.59 ft-lbs (8 N·m)
Important Notes
Ensure the sensor is properly seated 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 is it critical to use the correct torque specifications for brake bolts?

Using the correct torque specifications for brake bolts is essential for safety and performance. Under-torquing can lead to bolts loosening, causing component failure and potential loss of braking power. Over-torquing can stretch or break bolts, damage threads, and also lead to component failure. Correct torque ensures proper clamping force, which is vital for the brakes to function effectively and safely.

Q2

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

While it's strongly recommended to use a torque wrench, if you absolutely don't have one, it's far better to borrow or purchase one than to guess. In a pinch, you could use the 'feel' method, but this is very risky and often leads to under or over-torquing. If you must, tighten by hand until the bolt is snug and then rotate approximately 1/8th to 1/4 of a turn more. This is not precise and is only advisable to get a car moving so you can properly fix it, you must still have it properly torqued at the soonest possibility.

Q3

Can I reuse brake bolts?

In general, it's recommended to replace many brake bolts, particularly those that are aluminum or 'stretch' bolts (designed to stretch when tightened). However, some steel bolts can be reused if they are in good condition. Always refer to the Audi repair manual to determine if a specific bolt should be replaced. Using a damaged bolt will not properly provide the expected performance characteristics for its application.

Q4

How often should I check the torque on my brake bolts?

After initial installation, it's a good practice to re-check the torque on brake bolts after a short drive (approx. 50-100 miles) and then annually, or whenever you perform brake service. Temperature changes and vibrations can cause bolts to loosen, and checking will help prevent any issues that could lead to a major failure. For example, after a track day the bolts should be immediately rechecked.

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

A calibrated torque wrench is essential for tightening bolts to the manufacturer's specified torque. It prevents over-tightening and ensures proper clamping force.

  • 1/2-inch or 3/8-inch drive
  • Wide torque range suitable for brake components
  • Audible click or digital display to indicate reached torque
Learn more

Socket Set

A comprehensive socket set with various sizes is needed to fit the different bolts used on the brake system.

  • Metric sizes
  • Deep sockets for reaching recessed bolts
  • 6-point sockets for better grip
Learn more

Torx Bit Set

Torx bits are needed for some brake components, specifically caliper bolts.

  • Variety of Torx sizes including T30, T40, and T45
  • Durable construction to prevent stripping
  • 1/2-inch or 3/8-inch drive compatibility
Learn more
Service Procedures

Front Caliper Bracket Bolt Torque

Procedure to properly torque the front caliper bracket bolts on a 2009-2016 Audi S4.

  • Clean the threads of the bolts and the mating surfaces on the caliper bracket and spindle.
  • Position the caliper bracket to the spindle.
  • Install the bolts and hand-tighten.
  • Using a torque wrench, tighten the bolts to 150 Nm + 90 degrees (or as specified in your service manual).
  • Verify that the bolts are properly torqued using the same wrench.
  • Always replace the bolts as per the service manual
View full procedure

Front Caliper Guide Pin Bolt Torque

Procedure to properly torque the front caliper guide pin bolts on a 2009-2016 Audi S4.

  • Clean the threads of the bolts and the guide pins.
  • Position the caliper over the brake pads.
  • Install the guide pin bolts by hand.
  • Using a torque wrench, tighten the bolts to 35 Nm.
  • Verify that the bolts are properly torqued using the same wrench.
View full procedure

Rear Caliper Bracket Bolt Torque

Procedure to properly torque the rear caliper bracket bolts on a 2009-2016 Audi S4.

  • Clean the threads of the bolts and the mating surfaces on the caliper bracket and spindle.
  • Position the caliper bracket to the spindle.
  • Install the bolts and hand-tighten.
  • Using a torque wrench, tighten the bolts to 100 Nm + 90 degrees (or as specified in your service manual).
  • Verify that the bolts are properly torqued using the same wrench.
  • Always replace the bolts as per the service manual
View full procedure

Rear Caliper Guide Pin Bolt Torque

Procedure to properly torque the rear caliper guide pin bolts on a 2009-2016 Audi S4.

  • Clean the threads of the bolts and the guide pins.
  • Position the caliper over the brake pads.
  • Install the guide pin bolts by hand.
  • Using a torque wrench, tighten the bolts to 30 Nm.
  • Verify that the bolts are properly torqued using the same wrench.
View full procedure

Wheel Bolt Torque

Procedure to properly torque the wheel bolts on a 2009-2016 Audi S4.

  • Clean the threads of the wheel bolts and the wheel hub.
  • Position the wheel on the hub.
  • Install the bolts and hand-tighten in a star pattern.
  • Using a torque wrench, tighten the bolts to 120 Nm.
  • Verify that the bolts are properly torqued using the same wrench.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Corrosion Issues

2014-05-15

Some 2009-2012 Audi S4 models have reported corrosion issues with the brake caliper bolts. This can cause difficulty when removing or tightening bolts.

2009-2012

Resolution: Inspect caliper bolts for corrosion. If corrosion is present, replace with new bolts and apply anti-seize compound on the threads.

Brake Squeal Issues After Rotor Replacement

2015-09-22

Reports of brake squeal following rotor and/or pad replacement on 2013-2016 Audi S4 models. Incorrect torque can cause this issue

2013-2016

Resolution: Ensure that the caliper bracket and guide pin bolts are torqued to the specified values and that brake pads are properly installed. Clean and lubricate pad contact points with ceramic based brake grease

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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