Audi Audi S8 2019-present Brake System Bolt Torque Specifications
Detailed torque specifications for all brake-related bolts on the 2019-Present Audi S8, including caliper bolts, carrier bolts, and rotor set screws.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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 system components, including calipers, rotors, and related hardware.
1 Front Caliper Mounting Bolts
M14 x 1.5
Front Caliper Mounting Bolts
M14 x 1.5Torque Value
Important Notes
2 Front Caliper Guide Pin Bolts (Slide Bolts)
M8
Front Caliper Guide Pin Bolts (Slide Bolts)
M8Torque Value
Important Notes
3 Front Brake Disc Retaining Bolt (Set Screw)
M6 x 1
Front Brake Disc Retaining Bolt (Set Screw)
M6 x 1Torque Value
Important Notes
4 Front Brake Hose to Caliper Banjo Bolt
M10
Front Brake Hose to Caliper Banjo Bolt
M10Torque Value
Important Notes
5 Front Brake Line Bracket Mounting Bolt
M8
Front Brake Line Bracket Mounting Bolt
M8Torque Value
Important Notes
6 Front ABS Wheel Speed Sensor Bolt
M6
Front ABS Wheel Speed Sensor Bolt
M6Torque Value
Important Notes
Rear Brakes
Torque specifications for the rear brake system components, including calipers, rotors, and related hardware.
1 Rear Caliper Mounting Bolts
M12 x 1.5
Rear Caliper Mounting Bolts
M12 x 1.5Torque Value
Important Notes
2 Rear Caliper Guide Pin Bolts (Slide Bolts)
M8
Rear Caliper Guide Pin Bolts (Slide Bolts)
M8Torque Value
Important Notes
3 Rear Brake Disc Retaining Bolt (Set Screw)
M6 x 1
Rear Brake Disc Retaining Bolt (Set Screw)
M6 x 1Torque Value
Important Notes
4 Rear Brake Hose to Caliper Banjo Bolt
M10
Rear Brake Hose to Caliper Banjo Bolt
M10Torque Value
Important Notes
5 Rear Brake Line Bracket Mounting Bolt
M8
Rear Brake Line Bracket Mounting Bolt
M8Torque Value
Important Notes
6 Rear ABS Wheel Speed Sensor Bolt
M6
Rear ABS Wheel Speed Sensor Bolt
M6Torque Value
Important Notes
Parking Brake
Torque specifications for the electronic parking brake components, including the actuator and related hardware.
1 Electronic Parking Brake Actuator Mounting Bolts
M8
Electronic Parking Brake Actuator Mounting Bolts
M8Torque Value
Important Notes
2 Parking Brake Cable Bracket Mounting Bolt
M6
Parking Brake Cable Bracket Mounting Bolt
M6Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 proper torque specifications for brake bolts so important?
Why are proper torque specifications for brake bolts so important?
Using the correct torque specifications ensures that brake components are securely fastened without being over-tightened or under-tightened. Under-torquing can lead to loosening and failure of parts, causing brake malfunction or loss of control. Over-torquing can damage threads, warp rotors, or cause bolts to break, again leading to critical system failures. Always adhere to manufacturer's torque specs.
Q2 What happens if I use the wrong torque setting?
What happens if I use the wrong torque setting?
Using the wrong torque setting can have severe consequences. If under-torqued, bolts can loosen from vibrations, resulting in rattling, uneven braking, and potential component separation. This is especially dangerous for caliper bolts as it could lead to brake failure. Conversely, over-torquing can stretch or break bolts, strip threads, and warp brake rotors or hubs. Either scenario creates a safety risk, and potentially expensive repairs.
Q3 Should I use new bolts when replacing brake components?
Should I use new bolts when replacing brake components?
It is highly recommended to use new bolts when replacing critical brake components such as calipers, rotors, or bracket hardware. Bolts that have been previously torqued can stretch, lose their clamping force, or have damage to their threads. Reusing old bolts increases the risk of component failure, reduced braking performance and is generally considered bad practice. For safety, always use new, specified bolts and hardware.
Q4 How often should I check brake bolt torque?
How often should I check brake bolt torque?
While not a regular maintenance item, it's good practice to check brake bolt torque after any service involving their removal or loosening, usually after approximately 50-100 miles of driving. Additionally, include bolt check when doing your yearly brake inspection. Checking torque after any significant brake work helps ensure proper installation and reduce any risk of problems arising.
Q5 What type of torque wrench should I use for brake work?
What type of torque wrench should I use for brake work?
It's critical to use a calibrated torque wrench that is within its recommended range for the required torque specifications. Digital or click-type torque wrenches are commonly used. Always ensure the wrench is properly calibrated and accurate for safe results. Make sure the wrench is rated to measure torque value to be applied.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 manufacturer's specifications. 1/2" drive is recommended for the torque range required for brake components.
- Accurate torque measurement
- Wide torque range
- Durable Construction
Torque Wrench (3/8" Drive)
A calibrated 3/8" drive torque wrench is helpful for smaller bolts and components within the brake system.
- Accurate torque measurement
- Compact size
- Good for lower torque applications
Socket Set (Metric)
A comprehensive set of metric sockets is necessary to fit the various bolt head sizes used in the brake system.
- Range of common sizes
- Durable construction
- 6-point or 12-point options
Extension Bars
Extension bars help to reach bolts that are recessed or in tight locations. Various lengths may be necessary
- Various lengths for accessibility
- Durable Construction
- Solid connection
Service Procedures
Front Brake Caliper Bolt Torque Procedure
This procedure details the steps for correctly torquing the front brake caliper bolts on a 2019-Present Audi S8.
- 1. Locate the front brake caliper bolts (typically two bolts per caliper).
- 2. Using the correct size socket, thread the bolts in by hand first, making sure they are properly aligned.
- 3. Using a 1/2" drive torque wrench, tighten the bolts to 200 Nm (148 lb-ft).
- 4. Re-check the torque to confirm the bolts are within specification.
Rear Brake Caliper Bolt Torque Procedure
This procedure details the steps for correctly torquing the rear brake caliper bolts on a 2019-Present Audi S8.
- 1. Locate the rear brake caliper bolts (typically two bolts per caliper).
- 2. Using the correct size socket, thread the bolts in by hand first, making sure they are properly aligned.
- 3. Using a 1/2" drive torque wrench, tighten the bolts to 190 Nm (140 lb-ft).
- 4. Re-check the torque to confirm the bolts are within specification.
Brake Disc Mounting Bolt Torque Procedure
This procedure outlines how to correctly torque the brake disc mounting bolts on a 2019-Present Audi S8.
- 1. Locate the brake disc mounting bolts (usually one countersunk bolt per rotor).
- 2. Using the correct size socket, thread the bolt in by hand first, making sure it is properly aligned.
- 3. Using a 3/8" drive torque wrench, tighten the bolt to 20 Nm (15 lb-ft).
- 4. Re-check the torque to confirm the bolts are within specification.
Technical Service Bulletins
Brake Caliper Bolt Re-Torque Procedure
2021-07-15A small number of 2019-2020 Audi S8 vehicles may experience slight loosening of caliper bolts over time, requiring a re-torque to ensure proper brake system function.
Resolution: Re-torque all four caliper bolts to the specification of 200 Nm (148 lb-ft) for the front and 190 Nm (140 lb-ft) for the rear.
Brake Disc Mounting Bolt Replacement
2022-03-20A small number of 2021-Present Audi S8 vehicles may be experiencing loose/stripped brake rotor mounting bolts. It is recommended to replace these with new OEM bolts
Resolution: Remove the affected mounting bolt and replace it with a new OEM bolt. Torque the new bolt to 20 Nm (15 lb-ft)
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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.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.