Audi Audi TTS 2008-2014 Brake System Bolt Torque Specifications
Detailed torque specifications for all brake-related bolts on the 2008-2014 Audi TTS (Mk2) 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 components of the front brake system, including calipers, rotors, and related sensors.
1 Front Caliper Guide Pins
M10 x 1.5
Front Caliper Guide Pins
M10 x 1.5Torque Value
Important Notes
2 Front Caliper Mounting Bolts (to Hub/Carrier)
M14 x 1.5
Front Caliper Mounting Bolts (to Hub/Carrier)
M14 x 1.5Torque Value
Important Notes
3 Front Caliper Bleeder Screw
M7 x 1.0
Front Caliper Bleeder Screw
M7 x 1.0Torque Value
Important Notes
4 Front Brake Rotor Retaining Screw
M6 x 1.0
Front Brake Rotor Retaining Screw
M6 x 1.0Torque Value
Important Notes
5 Front Wheel Speed Sensor Bolt
M6 x 1.0
Front Wheel Speed Sensor Bolt
M6 x 1.0Torque Value
Important Notes
6 Front Brake Hose/Line to Caliper
M10 x 1.0
Front Brake Hose/Line to Caliper
M10 x 1.0Torque Value
Important Notes
Rear Brakes
Torque specifications for components of the rear brake system, including calipers, rotors, and related sensors.
1 Rear Caliper Guide Pins
M8 x 1.25
Rear Caliper Guide Pins
M8 x 1.25Torque Value
Important Notes
2 Rear Caliper Mounting Bolts (to Hub/Carrier)
M12 x 1.5
Rear Caliper Mounting Bolts (to Hub/Carrier)
M12 x 1.5Torque Value
Important Notes
3 Rear Caliper Bleeder Screw
M7 x 1.0
Rear Caliper Bleeder Screw
M7 x 1.0Torque Value
Important Notes
4 Rear Brake Rotor Retaining Screw
M6 x 1.0
Rear Brake Rotor Retaining Screw
M6 x 1.0Torque Value
Important Notes
5 Rear Wheel Speed Sensor Bolt
M6 x 1.0
Rear Wheel Speed Sensor Bolt
M6 x 1.0Torque Value
Important Notes
6 Rear Brake Hose/Line to Caliper
M10 x 1.0
Rear Brake Hose/Line to Caliper
M10 x 1.0Torque Value
Important Notes
Master Cylinder And Booster
Torque specifications for components related to the brake master cylinder and brake booster.
1 Brake Master Cylinder Mounting Bolts
M8 x 1.25
Brake Master Cylinder Mounting Bolts
M8 x 1.25Torque Value
Important Notes
2 Brake Booster Mounting Bolts
M8 x 1.25
Brake Booster Mounting Bolts
M8 x 1.25Torque Value
Important Notes
3 Brake Pedal Switch Mounting Screws
M5 x 0.8
Brake Pedal Switch Mounting Screws
M5 x 0.8Torque 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 is using the correct torque specification so important for brake bolts?
Why is using the correct torque specification so important for brake bolts?
Using the correct torque specification ensures that the brake components are securely fastened, preventing them from loosening during driving. Under-torquing can lead to bolts backing out and potentially causing brake failure. Over-torquing can damage the threads, distort the brake component, or cause premature bolt failure. For example, if a caliper bracket bolt is under-torqued, the caliper may shift, causing uneven braking and premature wear, or in an extreme case, the caliper could detach. If it's over-torqued, it could stretch the bolt or crack the bracket.
Q2 What happens if I over-tighten a brake caliper bolt?
What happens if I over-tighten a brake caliper bolt?
Over-tightening brake caliper bolts can stretch or even break the bolt itself, causing internal damage to the component's threads. This can lead to a situation where the bolt will not maintain its clamping force, creating the risk of the caliper becoming loose. In some cases, over-tightening can also distort the caliper housing, making future repairs more difficult and potentially compromising the braking system's integrity. For example, over tightening the caliper slider pins could cause them to bind and prevent the caliper from floating correctly.
Q3 Should I use new bolts every time I service the brakes?
Should I use new bolts every time I service the brakes?
While not always strictly required, it is highly recommended to use new bolts, especially for critical components like caliper brackets or the main caliper mounting bolts. These bolts are often torque-to-yield, meaning they stretch slightly during installation and can weaken over time. Reusing these bolts can lead to a decreased clamping force, increasing the risk of component failure. For example, a single use torque-to-yield bolt can not be trusted after re-use to provide correct clamping force.
Q4 What type of lubricant should I use on brake bolts?
What type of lubricant should I use on brake bolts?
Generally, a small amount of anti-seize compound should be used on the threads of brake bolts (unless otherwise specified by Audi). This prevents corrosion and makes it easier to remove the bolts during future maintenance. Avoid using excessive amounts as it could affect the torque reading. However, some bolts like the slider pins use special silicone based grease, never use anti-seize for them. It is important to verify the manual for the exact torque specification whether lubricant should be used or not.
Q5 How often should I inspect my brake bolts?
How often should I inspect my brake bolts?
Brake bolts should be inspected anytime you remove a wheel or conduct any work on the brake system. This should be done regularly, particularly if you frequently drive in challenging conditions, drive the car hard, or use it on a track. Pay special attention to the caliper bolts and mounting bracket bolts. Look for any sign of rust, damage, or if any are coming loose. If something looks wrong, it is advised to have the brake system serviced.
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 tightening bolts to the correct specifications, preventing damage or failure.
- Click-type mechanism for accurate torque application
- Range covering the required torque values (typically 20-160 Nm)
Torque Wrench (3/8" Drive)
A smaller torque wrench for lower torque applications on the brake system.
- Click-type mechanism for accurate torque application
- Range covering lower torque values (typically 5-80 Nm)
Socket Set (Metric)
A comprehensive set of metric sockets to fit various brake components bolts and fasteners.
- Variety of sizes (typically 8mm to 19mm)
- 6-point sockets for secure grip
Brake Caliper Piston Retractor Tool
Specialized tool for retracting brake caliper pistons to accommodate new brake pads.
- Adaptable for various caliper piston designs
- Prevents damage during piston retraction
Brake Cleaner
A solvent cleaner to remove brake dust and grime for proper torquing.
- Fast drying formula
- Safe for brake components
Service Procedures
Front Brake Caliper Removal and Installation
Procedure for removing and reinstalling front brake calipers on a 2008-2014 Audi TTS. Includes critical torque specifications.
- Loosen the wheel lug bolts.
- Raise and support the vehicle safely.
- Remove the wheel.
- Disconnect the brake pad wear sensor connector, if applicable.
- Loosen and remove the caliper guide bolts (12mm hex).
- Carefully remove the brake caliper from the rotor. Support the caliper to prevent damage to the brake line.
- To install, position the caliper onto the rotor and install the guide bolts (Typically 30 Nm).
- Reconnect the brake pad wear sensor connector.
- Reinstall the wheel.
- Lower the vehicle and torque the lug bolts to specification (typically 120 Nm).
- Pump the brake pedal several times to ensure proper brake engagement.
Rear Brake Caliper Removal and Installation
Procedure for removing and reinstalling rear brake calipers on a 2008-2014 Audi TTS. Includes critical torque specifications.
- Loosen the wheel lug bolts.
- Raise and support the vehicle safely.
- Remove the wheel.
- Disconnect the brake pad wear sensor connector, if applicable.
- Loosen and remove the caliper guide bolts (12mm hex).
- Carefully remove the brake caliper from the rotor. Support the caliper to prevent damage to the brake line.
- To install, position the caliper onto the rotor and install the guide bolts (Typically 30 Nm).
- Reconnect the brake pad wear sensor connector.
- Reinstall the wheel.
- Lower the vehicle and torque the lug bolts to specification (typically 120 Nm).
- Pump the brake pedal several times to ensure proper brake engagement.
Brake Disc Removal and Installation
Procedure for removing and installing brake discs on a 2008-2014 Audi TTS. Includes critical torque specifications.
- Remove the brake caliper as described in the previous procedures.
- Remove the rotor retaining screw using the appropriate tool, if applicable (Typically 8 Nm)
- Carefully remove the brake rotor.
- Clean the hub surface to ensure good contact.
- Install the new rotor and secure with the retaining screw (Typically 8 Nm).
- Reinstall the caliper as described in the previous procedures.
- Reinstall the wheel.
- Lower the vehicle and torque the lug bolts to specification (typically 120 Nm).
Technical Service Bulletins
Brake Caliper Guide Bolt Corrosion
2012-05-15Reports of corrosion on brake caliper guide bolts, leading to binding and uneven braking performance.
Resolution: Inspect and replace caliper guide bolts as needed, and apply anti-seize compound during reassembly. Ensure correct torque spec of (Typically 30 Nm).
Rear Brake Pad Wear Sensor Malfunction
2011-11-20Issue with rear brake pad wear sensors becoming loose or malfunctioning, leading to false warnings.
Resolution: Ensure correct seating and connection of wear sensor. Replace sensor if damaged. Ensure all mounting bolts are torqued properly.
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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.