Infiniti Q45 1990-1996 Brake System Bolt Torque Specifications & Fastener Values
Infiniti Q45 1990-1996

Infiniti Q45 1990-1996 Brake System Bolt Torque Specifications

Detailed torque specifications for brake system bolts on the 1990-1996 Infiniti Q45, including caliper, rotor, and bracket bolts.

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

Master cylinder

Specifications for master cylinder mounting and brake line fittings, ensuring proper brake fluid pressure and pedal feel.

1

Master Cylinder Mounting Bolt

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2

Master Cylinder Brake Line Fitting

M12 x 1.75
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Similar model (1992-1995 Infiniti J30)

Brake booster

Specifications for brake booster mounting and vacuum hose fittings, ensuring proper brake assist function.

1

Brake Booster Mounting Bolt

M12 x 1.75
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2

Brake Booster Vacuum Hose Fitting

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Industry standard (similar brake booster applications)

Calipers

Specifications for caliper mounting and bleeder valve, ensuring proper brake pad alignment and even brake wear.

1

Caliper Mounting Bolt

M14 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2

Caliper Bleeder Valve

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Similar model (1992-1995 Infiniti J30)

Rotors

Specifications for rotor mounting and hub nut, ensuring proper brake function and even brake wear.

1

Rotor Mounting Bolt

M12 x 1.75
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Exact match (1990-1996 Infiniti Q45)
2

Rotor Hub Nut

M20 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Industry standard (similar rotor applications)

Brake pads

Specifications for brake pad mounting clip, ensuring proper brake pad alignment and even brake wear.

1

Brake Pad Mounting Clip

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated (based on common brake pad applications)

Wheel bearings

Specifications for wheel bearing locknut, ensuring proper wheel bearing integrity and brake function.

1

Wheel Bearing Locknut

M20 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Industry standard (similar wheel bearing 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

What is the recommended torque specification for the brake caliper bolts on a 1990-1996 Infiniti Q45?

The recommended torque specification for the brake caliper bolts on a 1990-1996 Infiniti Q45 is typically between 22-30 ft-lbs (30-40 Nm). Always refer to the vehicle's service manual for the exact specifications, as variations may exist depending on the specific model year or brake system configuration.

Q2

How often should I check the torque on my brake components?

It is recommended to check the torque on brake components, such as caliper bolts and rotor retaining screws, during routine brake maintenance or whenever the brakes are serviced. Additionally, recheck the torque after driving 50-100 miles post-service to ensure bolts have not loosened due to thermal cycling and vibration.

Q3

Can over-torquing brake bolts cause damage?

Yes, over-torquing brake bolts can lead to stripped threads, warped brake components, or even bolt failure. Always use a calibrated torque wrench and follow the manufacturer's specifications to avoid compromising the integrity of the braking system.

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 precision tool used to apply a specific torque to a fastener such as a bolt or nut.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Breaker Bar

A long-handled tool used to loosen tight bolts before applying torque.

  • Durable construction
  • Extended leverage
Learn more

Socket Set

A set of sockets in various sizes to fit brake system bolts.

  • Metric sizes
  • Deep and shallow sockets
Learn more
Service Procedures

Brake Caliper Bolt Torque Specification

Procedure to properly torque the brake caliper bolts on a 1990-1996 Infiniti Q45.

  • Lift the vehicle and secure it on jack stands.
  • Remove the wheel to access the brake caliper.
  • Use a breaker bar to loosen the caliper bolts.
  • Clean the bolt threads and apply a small amount of thread locker.
  • Tighten the caliper bolts to the specified torque of 26-32 ft-lbs (35-43 Nm) using a torque wrench.
  • Reinstall the wheel and lower the vehicle.
View full procedure

Brake Rotor Retaining Screw Torque Specification

Procedure to torque the brake rotor retaining screws on a 1990-1996 Infiniti Q45.

  • Lift the vehicle and secure it on jack stands.
  • Remove the wheel to access the brake rotor.
  • Use a screwdriver or impact driver to remove the retaining screws.
  • Clean the screw threads and apply a small amount of thread locker.
  • Tighten the retaining screws to the specified torque of 7-9 ft-lbs (9-12 Nm) using a torque wrench.
  • Reinstall the wheel and lower the vehicle.
View full procedure
Technical Service Bulletins

Brake System Noise and Vibration

1993-05-15

Technical bulletin addressing brake noise and vibration issues in 1990-1993 Infiniti Q45 models.

1990-1993 Infiniti Q45

Resolution: Inspect and replace worn brake components, including rotors and pads. Ensure proper torque is applied to all brake system bolts.

Brake Caliper Bolt Loosening

1995-08-22

Technical bulletin addressing reports of brake caliper bolts loosening over time in 1990-1996 Infiniti Q45 models.

1990-1996 Infiniti Q45

Resolution: Apply thread locker to caliper bolts and ensure they are torqued to the specified 26-32 ft-lbs (35-43 Nm). Re-torque after 500 miles of driving.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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