Audi Audi RS4 2005-2008 Brake System Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2005-2008

Audi Audi RS4 2005-2008 Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2005-2008 Audi RS4 (B7) including caliper bolts, carrier bolts, and rotor retaining screws.

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, including calipers, carriers, rotors, and hoses.

1

Caliper Mounting Bolts (to Carrier)

M14 x 1.5
Torque Value
92 ft-lbs (125 N·m)
Important Notes
Critical safety component. Ensure proper torque to prevent caliper movement and maintain even pad wear.
2

Caliper Carrier Mounting Bolts (to Steering Knuckle)

M12 x 1.75
Important Notes
High-load fasteners. Torque plus angle ensures proper bolt stretch. Follow the specific sequence if required by service manual.
3

Brake Disc Rotor Retaining Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Small bolt, primarily for assembly. Do not over-tighten.
4

Brake Hose Banjo Bolt (at Caliper)

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure leak-free seal. Use new crush washers each time this bolt is undone.
5

Brake Pad Retaining Pins/Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value. Check specific caliper design for exact spec. Proper torque prevents rattle or misalignment.

Rear Brakes

Torque specifications for components of the rear brake system, including calipers, carriers, rotors, and hoses.

1

Caliper Mounting Bolts (to Carrier)

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Critical for safe and effective rear braking performance.
2

Caliper Carrier Mounting Bolts (to Wheel Hub Assembly)

M12 x 1.75
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Important for load bearing and safety.
3

Brake Disc Rotor Retaining Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Small bolt, primarily for assembly. Do not over-tighten.
4

Brake Hose Banjo Bolt (at Caliper)

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure a leak-free seal. Use new crush washers each time this bolt is undone.
5

Brake Pad Retaining Pins/Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value. Check specific caliper design for exact spec. Proper torque prevents rattle or misalignment.

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
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque prevents leaks and movement compromising the hydraulic system.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Critical for proper pedal feel, booster function, and safety.

Brake Lines And Sensors

Torque specifications for brake line fittings and ABS sensor mounting bolts.

1

Brake Line Fittings (Hard lines to flexible hoses)

M10 x 1.0 (Flare Fitting)
Torque Value
11 ft-lbs (15 N·m)
Important Notes
These fittings connect hard brake lines to flexible hoses. Proper torque prevents leaks in the hydraulic system.
2

ABS Sensor Mounting Bolt

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Over-tightening can damage the sensor. Proper torque is important for sensor functionality.

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 is crucial for brake safety and performance. Under-torquing can lead to bolts loosening, potentially causing brake failure or component damage. Over-torquing can damage threads, weaken the bolt, or distort brake components, also leading to failure. Correct torque ensures proper clamping force and secure fastening.

Q2

What happens if I overtighten a brake caliper bolt?

Overtightening a brake caliper bolt can stretch the bolt beyond its yield point, leading to weakening, potential thread damage, and ultimately failure. The caliper itself could also be distorted, impacting brake performance. It’s essential to use a torque wrench and adhere to the specified torque values. For example, overtightening the caliper mounting bolts might cause warping which could cause uneven pad wear and braking.

Q3

Can I reuse brake rotor retaining screws or caliper bolts?

Generally, it is not recommended to reuse critical brake hardware like rotor retaining screws or caliper bolts, especially those specified as 'torque-to-yield' or single-use. These components may stretch when tightened to the specified torque and should be replaced. Reusing them could lead to inaccurate clamping force and failure of the brake system. Example: the guide pins should always be replaced as well as the bolts.

Q4

What is the best way to ensure I'm torquing bolts correctly?

Always use a calibrated torque wrench. Double-check the specified torque values for each bolt and tighten in a star pattern or specified order. Ensure the bolt threads are clean and lightly lubricated with the correct anti-seize where specified. A good practice is to tighten the bolts in multiple passes, gradually increasing to the final torque. Ensure your wrench is within calibration and consider purchasing a new one if you have reason to believe that it might be out of specification.

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 1/2" drive torque wrench is essential for accurately tightening brake components to their specified torque values. A range of 20-150 ft-lbs will cover most brake related bolts.

  • Accurate torque readings
  • Durable construction
Learn more

Torque Wrench (3/8" Drive)

A 3/8" drive torque wrench is useful for tighter spaces or smaller brake bolts and fittings. A range of 5-80 ft-lbs will cover smaller brake bolts.

  • Accurate torque readings
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive metric socket set is necessary for fitting various bolt sizes used in the brake system.

  • Variety of sizes
  • Durable materials
Learn more

Brake Caliper Hanger

A brake caliper hanger is used to support the brake caliper when it is removed from the rotor, preventing stress on the brake line.

  • Prevents brake line damage
  • Easy to use
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Procedure

This procedure outlines how to correctly torque the front brake caliper bolts on a 2005-2008 Audi RS4.

  • 1. Loosen the caliper bolts before lifting the car, so when lifting you aren't fighting the suspension
  • 2. Safely lift the vehicle and support it on jack stands
  • 3. Remove the front wheel.
  • 4. Remove the two caliper bolts.
  • 5. With the caliper off the rotor, inspect for damage
  • 6. Reinstall the caliper. The torque specification is 110 Nm (81 ft-lbs) for the guide bolts
  • 7. Tighten the two caliper bolts to 110 Nm (81 ft-lbs) using a torque wrench and the correct socket size.
  • 8. Reinstall the wheel, and lower the car back to the ground, torqueing the wheels as the final step
View full procedure

Rear Brake Caliper Bolt Torque Procedure

This procedure outlines how to correctly torque the rear brake caliper bolts on a 2005-2008 Audi RS4.

  • 1. Loosen the caliper bolts before lifting the car, so when lifting you aren't fighting the suspension
  • 2. Safely lift the vehicle and support it on jack stands.
  • 3. Remove the rear wheel.
  • 4. Remove the two caliper bolts.
  • 5. With the caliper off the rotor, inspect for damage
  • 6. Reinstall the caliper. The torque specification is 65 Nm (48 ft-lbs) for the guide bolts
  • 7. Tighten the two caliper bolts to 65 Nm (48 ft-lbs) using a torque wrench and the correct socket size.
  • 8. Reinstall the wheel, and lower the car back to the ground, torqueing the wheels as the final step
View full procedure

Front Brake Caliper Carrier Bolt Torque Procedure

This procedure outlines how to correctly torque the front brake caliper carrier bolts on a 2005-2008 Audi RS4.

  • 1. Safely lift the vehicle and support it on jack stands.
  • 2. Remove the front wheel.
  • 3. Remove the two caliper carrier bolts.
  • 4. With the carrier off the rotor, inspect for damage
  • 5. Reinstall the caliper carrier. The torque specification is 180 Nm (133 ft-lbs).
  • 6. Tighten the two caliper carrier bolts to 180 Nm (133 ft-lbs) using a torque wrench and the correct socket size.
  • 7. Reinstall the wheel, and lower the car back to the ground, torqueing the wheels as the final step
View full procedure

Rear Brake Caliper Carrier Bolt Torque Procedure

This procedure outlines how to correctly torque the rear brake caliper carrier bolts on a 2005-2008 Audi RS4.

  • 1. Safely lift the vehicle and support it on jack stands.
  • 2. Remove the rear wheel.
  • 3. Remove the two caliper carrier bolts.
  • 4. With the carrier off the rotor, inspect for damage
  • 5. Reinstall the caliper carrier. The torque specification is 125 Nm (92 ft-lbs)
  • 6. Tighten the two caliper carrier bolts to 125 Nm (92 ft-lbs) using a torque wrench and the correct socket size.
  • 7. Reinstall the wheel, and lower the car back to the ground, torqueing the wheels as the final step
View full procedure

Brake Line Banjo Bolt Torque Procedure

This procedure outlines how to correctly torque the brake line banjo bolts on a 2005-2008 Audi RS4.

  • 1. Ensure the brake system has been depressurized before removal
  • 2. Carefully remove the old banjo bolt and crush washers
  • 3. Install new crush washers on each side of the brake line fitting.
  • 4. Thread the banjo bolt back into the caliper or brake line fitting by hand.
  • 5. Tighten the banjo bolt to 30 Nm (22 ft-lbs) using a torque wrench and the correct socket size.
  • 6. Bleed the brake system.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Corrosion Issue

2007-05-15

Some 2005-2008 Audi RS4 models have experienced issues with brake caliper bolt corrosion due to road salt exposure. This can affect proper torque and potentially lead to bolt failure.

2005-2008

Resolution: Replace corroded bolts with new, coated bolts and apply anti-seize lubricant. Ensure bolts are torqued to the specified values during reassembly.

Front Caliper Carrier Bolt Loosening

2006-11-20

A small number of early 2006 model RS4's have been found to have issues with the front caliper carrier bolts loosening under high braking stress.

2006

Resolution: Inspect the bolts and torque to the specification of 180 Nm (133 ft-lbs). Use thread locking compound on the threads for added security. Retorque after 1000 miles.

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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