Audi Audi RS4 2000-2001 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2000-2001

Audi Audi RS4 2000-2001 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension bolts on the 2000-2001 Audi RS4 B5 platform. Includes front and rear suspension 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

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Front Upper Control Arms

Specifications for bolts related to the front upper control arms, which connect the wheel assembly to the vehicle's chassis, controlling camber and stability.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Secures the upper control arms to the chassis. Proper torque is critical to prevent movement and maintain correct suspension geometry.
2

Upper Control Arm to Spindle/Upright Bolts

M10 x 1.25
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the upper control arm to the steering knuckle (upright). Improper torque could lead to play in the joint.

Front Lower Control Arms

Specifications for bolts related to the front lower control arms, which are primary load-bearing components for the front suspension.

1

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the main lower control arm to the chassis. They bear a significant load and are crucial for proper suspension function.
2

Lower Control Arm Ball Joint to Spindle Bolt

M12 x 1.5
Important Notes
Secures the lower control arm ball joint to the steering knuckle. Correct torque and angle are essential for safety and stability. This is a stretch bolt procedure.

Front Sway Bar

Specifications for bolts related to the front sway bar, which improves handling and reduces body roll.

1

Anti-Roll Bar (Sway Bar) Link to Strut Bolts

M10 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the anti-roll bar link to the strut assembly. Proper torque ensures the anti-roll bar can effectively transfer load during cornering.

Front Strut Assembly

Specifications for bolts related to the front strut assembly, which is critical for suspension damping and structural integrity.

1

Strut to Spindle/Upright Bolts

M14 x 1.5
Torque Value
75 ft-lbs (102 N·m)
Important Notes
These crucial bolts connect the strut to the steering knuckle and are critical to maintaining wheel alignment, stability, and structural integrity. These are SAFETY-CRITICAL.
2

Strut Top Mount to Chassis Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
These bolts secure the strut assembly to the chassis. Correct torque is important for proper suspension function and NVH (Noise, Vibration, Harshness) control.

Front Brakes

Specifications for bolts related to the front braking system, which is attached to the front suspension components.

1

Brake Caliper Mounting Bolts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
These are crucial for safety, attached to the steering knuckle and critical for safe braking. Proper torque is necessary to prevent caliper movement or vibration. SAFETY-CRITICAL.
2

Brake Rotor Retaining Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
This small bolt holds the brake rotor in place during assembly. It's not structurally critical for braking but does need to be secured with appropriate torque. (Estimated)

Rear Upper Control Arms

Specifications for bolts related to the rear upper control arms, which control rear camber and stability.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Similar to the front, these bolts attach the upper control arm to the chassis and are critical for alignment and stability.
2

Upper Control Arm to Spindle/Upright Bolts

M10 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These secure the upper control arm to the spindle/upright. Improper torque affects wheel alignment and suspension geometry.

Rear Lower Control Arms

Specifications for bolts related to the rear lower control arms, which are primary load-bearing components for the rear suspension.

1

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Attaches the main lower control arm to the chassis. This is a load-bearing bolt, essential for suspension function and vehicle stability.
2

Lower Control Arm to Spindle Bolt

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Connects the lower control arm to the spindle. Important for maintaining suspension geometry.

Rear Sway Bar

Specifications for bolts related to the rear sway bar, which improves handling and reduces body roll.

1

Anti-Roll Bar (Sway Bar) Link to Control Arm Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Attaches the anti-roll bar link to the control arm. Important for sway bar function. (Estimated)

Rear Shocks

Specifications for bolts related to the rear shock absorbers, which control damping and vehicle stability.

1

Shock Absorber Lower Bolt

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Connects the shock absorber to the lower control arm or spindle. This is a high-stress bolt, and proper torque is essential for safety.
2

Shock Absorber Upper Mount Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the upper shock mount to the chassis. Proper torque is crucial for NVH control and proper damping function.

Rear Brakes

Specifications for bolts related to the rear braking system, which is attached to the rear suspension components.

1

Rear Brake Caliper Mounting Bolts

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Crucial for safety. Prevents movement or vibration of the caliper. SAFETY-CRITICAL.
2

Rear Brake Rotor Retaining Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
This small bolt holds the brake rotor in place during assembly. Not critical for braking function, but needed for re-assembly. (Estimated)

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 are torque specifications so important for suspension bolts?

Proper torque ensures the bolts are tightened enough to hold components securely, preventing loosening and potential failure, but not so tight that they stretch or damage threads. Under-torquing can lead to component separation, while over-torquing can result in bolt failure, both leading to dangerous situations. For example, if a control arm bolt is under-torqued, the arm can move unexpectedly, impacting vehicle handling and potentially leading to loss of control. Over-torquing can cause the bolt to shear, resulting in immediate suspension failure.

Q2

Do I need to replace suspension bolts when removing and reinstalling components?

It is highly recommended, especially for critical components like control arms and tie rod ends. Many suspension bolts are torque-to-yield (TTY) and designed for one-time use. TTY bolts stretch slightly upon tightening, providing clamping force. Reusing these bolts can lead to insufficient clamping force or bolt failure. An example would be the main control arm bolts which should always be replaced, even if they appear fine, to ensure they meet the design specifications.

Q3

What if I don't have the specified torque wrench?

Using the correct tool is crucial. A torque wrench is specifically designed to measure applied torque and should be used in conjunction with the recommended torque specifications. Using generic tools or guessing tightness can lead to under-torquing or over-torquing, both with serious safety consequences. If a torque wrench is unavailable, seek professional help.

Q4

Should I lubricate the threads before tightening suspension bolts?

Generally, no unless the manufacturer specifically states so. Lubricating threads affects the friction between the bolt and nut, altering the torque required to achieve the correct clamping force. When specified, use only the recommended type of lubricant. For dry threads, torque is typically calculated assuming dry friction coefficients. Adding lubrication will potentially lead to an over-torqued condition which could result in bolt failure.

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 suspension bolts to the correct specifications, preventing damage and ensuring safety.

  • Adjustable torque settings
  • Accurate measurement
  • Multiple drive sizes (1/2", 3/8")
Learn more

Socket Set

A comprehensive socket set is needed to fit the various bolt and nut sizes used in the RS4 suspension.

  • Metric sizes
  • Various depths
  • Durable construction
Learn more

Wrench Set

A set of open-end and box-end wrenches may be needed for some suspension components

  • Metric sizes
  • Durable construction
  • Variety of sizes
Learn more

Jointed Breaker Bar

A jointed breaker bar is useful for loosening stubborn bolts and nuts in the suspension system.

  • Long handle for leverage
  • Jointed head for access
  • Durable construction
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

This procedure outlines the proper steps to torque the bolts on the upper control arms of the Audi RS4 front suspension.

  • Locate the upper control arm bolts connecting the arm to the chassis.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 70 Nm + 90 Deg)
  • Double check each bolt to ensure correct torque.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

This procedure outlines the proper steps to torque the bolts on the lower control arms of the Audi RS4 front suspension.

  • Locate the lower control arm bolts connecting the arm to the chassis and subframe.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 70 Nm + 90 Deg).
  • Double check each bolt to ensure correct torque.
View full procedure

Front Strut/Shock Assembly Bolt Torque Procedure

This procedure details how to properly torque the strut/shock assembly mounting bolts for an Audi RS4.

  • Locate the bolts securing the strut/shock assembly to the wheel bearing carrier.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 100 Nm + 90 Deg).
  • Double check each bolt to ensure correct torque.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

This procedure outlines the proper steps to torque the bolts on the upper control arms of the Audi RS4 rear suspension.

  • Locate the rear upper control arm bolts connecting the arm to the chassis.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 70 Nm + 90 Deg)
  • Double check each bolt to ensure correct torque.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

This procedure outlines the proper steps to torque the bolts on the lower control arms of the Audi RS4 rear suspension.

  • Locate the rear lower control arm bolts connecting the arm to the chassis and subframe.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 70 Nm + 90 Deg).
  • Double check each bolt to ensure correct torque.
View full procedure

Rear Strut/Shock Assembly Bolt Torque Procedure

This procedure details how to properly torque the strut/shock assembly mounting bolts for an Audi RS4.

  • Locate the bolts securing the strut/shock assembly to the wheel bearing carrier.
  • Using the correct socket, snug the bolts into place.
  • Using a calibrated torque wrench, tighten the bolts to the specified torque (See manufacturer's specification: 70 Nm + 90 Deg).
  • Double check each bolt to ensure correct torque.
View full procedure
Technical Service Bulletins

Suspension Bolt Re-Torque Recommendation After Initial Service

2002-05-15

After any significant suspension service involving the removal and reinstallation of bolts, it is recommended that these bolts be re-torqued after approximately 500 - 1000 miles to account for settling and potential bolt stretch.

2000-2001 Audi RS4

Resolution: Retorque all suspension bolts to their specified torque after approximately 500-1000 miles after initial service.

Use of New Bolts After Suspension Component Replacement

2003-03-20

Audi recommends replacing suspension bolts anytime they are removed to ensure proper clamping force and prevent loosening. Certain bolts are stretch bolts and must not be re-used

2000-2001 Audi RS4

Resolution: Replace all suspension bolts after removing for replacement of the associated component.

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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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