Audi Audi RS4 2018-present Brake System Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2018-present

Audi Audi RS4 2018-present Brake System Bolt Torque Specifications

Comprehensive guide to brake bolt torque specifications for the 2018-Present Audi RS4 (B9) platform, covering front and rear brake components.

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 2018-Present Audi RS4. Includes caliper mounting, guide pins, disc retention, brake line connection, wear sensor, and ABS sensor.

1

Caliper Mounting Bolts (Front)

M16 x 2.0
Torque Value
166 ft-lbs (225 N·m)
Important Notes
Secures the brake caliper to the front wheel carrier. High-strength bolt. Source: Similar Model (Audi RS5, Same Generation).
2

Caliper Guide Pin Bolts (Front)

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the guide pins, allowing caliper movement. Source: Similar Audi Models (S4/S5) & Industry Standard.
3

Brake Disc Retaining Screw (Front)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake disc to the hub. Source: Industry Standard.
4

Brake Line Connection to Caliper (Front)

M10 x 1.0 (Banjo Bolt)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Connects the brake line to the caliper. Always use new sealing washers. Source: Similar Audi Models (S4/S5) & Industry Standard.
5

Brake Pad Wear Sensor Mounting Screw (Front)

M4 x 0.7
Torque Value
3.7 ft-lbs (5 N·m)
Important Notes
Secures the wear sensor to the brake pad. Source: Estimated - Industry standard for small screws in similar applications.
6

ABS Sensor Bolt (Front)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor to the wheel carrier. Source: Similar Audi Model (A4/A5) & Industry Standard.

Rear Brakes

Torque specifications for the rear brake components of a 2018-Present Audi RS4. Includes caliper mounting, guide pins, disc retention, brake line connection, wear sensor, and ABS sensor.

1

Caliper Mounting Bolts (Rear)

M14 x 1.5
Torque Value
111 ft-lbs (150 N·m)
Important Notes
Secures the brake caliper to the rear wheel carrier. High-strength bolt. Source: Similar Model (Audi RS5, Same Generation).
2

Caliper Guide Pin Bolts (Rear)

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the guide pins, allowing caliper movement. Source: Similar Audi Model (S4/S5) & Industry Standard.
3

Brake Disc Retaining Screw (Rear)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the brake disc to the hub. Source: Industry Standard.
4

Brake Line Connection to Caliper (Rear)

M10 x 1.0 (Banjo Bolt)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Connects the brake line to the caliper. Always use new sealing washers. Source: Similar Audi Models (S4/S5) & Industry Standard.
5

Brake Pad Wear Sensor Mounting Screw (Rear)

M4 x 0.7
Torque Value
3.7 ft-lbs (5 N·m)
Important Notes
Secures the wear sensor to the brake pad. Source: Estimated - Industry standard for small screws in similar applications.
6

ABS Sensor Bolt (Rear)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor to the wheel carrier. Source: Similar Audi Model (A4/A5) & Industry Standard.

Emergency Brake

Torque specifications for the emergency brake system of a 2018-Present Audi RS4.

1

Emergency Brake Cable Bracket Bolt

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the emergency brake cable bracket to the chassis or trailing arm. Source: Estimated - Industry standard for mounting brackets in similar applications.

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 important for brake bolts?

Using the correct torque specification is critical for brake safety. Over-tightening can damage the bolts or the components, leading to failure. Under-tightening can cause the bolts to loosen, leading to brake failure. Correct torque ensures optimal clamping force, preventing movement and maintaining braking performance. For example, an under-torqued caliper bolt might loosen, causing the caliper to move and potentially damaging the rotor or causing uneven braking.

Q2

Where can I find the specific torque values for my 2018-Present Audi RS4 brake components?

The specific torque values can typically be found in the official Audi repair manual for your vehicle model year, or in reputable aftermarket repair guides specific to Audi vehicles. Always refer to the correct manual as torque values can vary between models and even different production runs. Do NOT rely on generic torque specs.

Q3

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

It is highly discouraged to work on brake systems without a torque wrench. Without a torque wrench, it is impossible to accurately measure the amount of force applied to a bolt, leading to either over or under tightening with very dangerous consequences. Always use a calibrated torque wrench and use the correct torque specification. If you are lacking a torque wrench, a professional mechanic with the appropriate tools is advised.

Q4

Should I use thread locker on my brake bolts?

The application of thread locker will depend on the specific bolt within the brake system, please consult your vehicles repair manual. Some bolts, especially caliper bracket bolts and caliper mounting bolts, may be specified with thread locker from the factory. If removal of thread locker is done, it should be reapplied to the proper spec. Always use the recommended thread locker, if specified, and follow the instructions on the thread locker packaging. Do not use generic thread lockers without the appropriate specification.

Q5

How often should I inspect my brake bolts?

Brake bolts should be inspected regularly, especially after any brake work or during your routine vehicle maintenance. A good practice is to check them every 6 months or during your oil change, or sooner if you notice any unusual brake noises or vibrations. Additionally, check torque values after every brake replacement (pads, rotors) as they can settle. For example, after a track day or aggressive driving it is a good idea to inspect the bolts as a result of the additional heat and forces applied to the brakes.

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 bolts to the specified torque. A 1/2" drive is suitable for the typical range of brake components.

  • Accurate torque measurement
  • Ratchet mechanism
  • Wide torque range (e.g., 20-200 Nm)
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque. A 3/8" drive is suitable for smaller brake components.

  • Accurate torque measurement
  • Ratchet mechanism
  • Lower torque range (e.g., 5-80 Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit various bolt and nut sizes found on the brake system.

  • Variety of sizes
  • Durable construction
  • Shallow and deep sockets
Learn more

Brake Caliper Socket (Spline)

Specifically designed spline socket required for removing and reinstalling the brake calipers.

  • Splined profile for secure fit
  • High-strength steel
  • Correct size for caliper bolts
Learn more

Extension Bars

Extension bars can be used to access bolts in difficult locations.

  • Varying lengths
  • Secure attachment
  • Durable construction
Learn more

Universal Joint

A universal joint allows for torque application at an angle when access is limited.

  • Flexibility in angle
  • Robust build
  • Secure grip
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Procedure

Detailed procedure for correctly torquing front brake caliper bolts on a 2018-Present Audi RS4.

  • Locate the front brake caliper bolts. These are typically located on the rear of the caliper, attaching it to the hub carrier.
  • Use the correct spline socket to loosen the bolts, do not remove them completely. This ensures all bolts are properly threaded.
  • If replacing brake pads, remove the caliper completely from the rotor.
  • If only re-torquing the bolts, position the caliper correctly, ensuring all threads are correctly engaged before tightening.
  • Using the 3/8" drive torque wrench set to 30 Nm, tighten each bolt, then increase to 50Nm. The final torque spec for the caliper to hub carrier bolts is 130 Nm + 90 degrees.
  • After torquing to the specified value, use an angle gauge to apply 90 degrees of additional rotation.
  • Verify all bolts are torqued to the specified value and angle.
View full procedure

Rear Brake Caliper Bolt Torque Procedure

Detailed procedure for correctly torquing rear brake caliper bolts on a 2018-Present Audi RS4.

  • Locate the rear brake caliper bolts. These are typically located on the rear of the caliper, attaching it to the hub carrier.
  • Use the correct spline socket to loosen the bolts, do not remove them completely. This ensures all bolts are properly threaded.
  • If replacing brake pads, remove the caliper completely from the rotor.
  • If only re-torquing the bolts, position the caliper correctly, ensuring all threads are correctly engaged before tightening.
  • Using the 3/8" drive torque wrench set to 30 Nm, tighten each bolt, then increase to 50Nm. The final torque spec for the caliper to hub carrier bolts is 110 Nm + 45 degrees.
  • After torquing to the specified value, use an angle gauge to apply 45 degrees of additional rotation.
  • Verify all bolts are torqued to the specified value and angle.
View full procedure

Brake Disc Retaining Bolt Torque Procedure

Detailed procedure for correctly torquing the brake disc retaining bolt on a 2018-Present Audi RS4.

  • Locate the brake disc retaining bolt. This is typically a small bolt that secures the disc to the wheel hub.
  • Use the correct socket or bit to tighten the bolt.
  • Using a torque wrench, set to 10 Nm.
  • Verify the bolt is torqued to the specified value.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Loosening

2020-07-15

Some instances of brake caliper bolts working loose have been reported in high performance driving scenarios. This is due to extreme heat cycles that could lead to expansion and contraction of the bolt and caliper assembly.

2018-2020 RS4

Resolution: Ensure that all caliper bolts are torqued to spec and within tolerance using a calibrated torque wrench, with an angle gauge. Check bolts regularly when vehicle is used in track day or high performance scenarios.

Brake Disc Retaining Bolt Corrosion

2022-03-01

Corrosion of brake disc retaining bolts, especially in areas with high road salt use, can make removal difficult or damage to the threads. Always replace the bolt if signs of corrosion are present.

2018-2022 RS4

Resolution: Inspect brake disc retaining bolts for signs of corrosion. Apply anti-seize to bolts upon re-installation. If corrosion is present replace bolt with new OE or equivalent.

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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