BMW 440i 2017-present Brake System Bolt Torque Specifications & Fastener Values
BMW 440i 2017-present

BMW 440i 2017-present Brake System Bolt Torque Specifications

This page provides detailed torque specifications for various brake system bolts on the 2017-Present BMW 440i (F32, F33, F36) models. Includes caliper bolts, carrier bolts, and rotor set 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 Brake Caliper

Specifications for front brake caliper mounting, brake lines, and related components. Proper torquing is critical for brake performance and safety.

1

Front Caliper Mounting Bolts

M14 x 1.5
Torque Value
95 ft-lbs (129 N·m)
Important Notes
These are often single-use bolts and should be replaced. Torque in a cross pattern.
2

Front Brake Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Do not over-torque.
3

Front Brake Pad Retaining Pins/Bolts

M6 x 1.0
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Ensure pins/bolts are properly seated. Do not over-tighten, or damage the caliper.
4

Front Brake Caliper Bleeder Screw

M7 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten gently to seal. Do not over-tighten, or damage the bleeder screw and caliper threads. Estimated value based on common bleeder screw sizes.

Rear Brake Caliper

Specifications for rear brake caliper mounting, brake lines, and related components. Proper torquing is critical for brake performance and safety.

1

Rear Caliper Mounting Bolts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
These are often single-use bolts and should be replaced. Torque in a cross pattern.
2

Rear Brake Caliper Banjo Bolt

M10 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Use new crush washers. Do not over-torque.
3

Rear Brake Pad Retaining Pins/Bolts

M6 x 1.0
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Ensure pins/bolts are properly seated. Do not over-tighten, or damage the caliper.
4

Rear Brake Caliper Bleeder Screw

M7 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Tighten gently to seal. Do not over-tighten, or damage the bleeder screw and caliper threads. Estimated value based on common bleeder screw sizes.

Brake Rotor

Specifications for brake rotor mounting and related components. Proper torque is crucial for rotor alignment and preventing vibrations.

1

Brake Rotor Retaining Bolt/Screw

M6 x 1.0
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure rotor is properly seated against the hub. Torque to manufacturer's specification. Estimated based on common sizes for this bolt.

Master Cylinder

Specifications for the brake master cylinder mounting and line connections. Proper torque is crucial for maintaining a sealed hydraulic system and secure installation.

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure the master cylinder is properly aligned. Torque in a cross pattern if multiple bolts are used. Estimated based on common sizes for master cylinder mounting bolts.
2

Brake Master Cylinder Line Fittings

M10 x 1.0
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Use care when tightening to avoid damaging the fittings. Ensure fittings are properly aligned before tightening. Estimated value based on common line fitting sizes.

Wheel Mounting

Specifications for wheel mounting components including lug nuts, necessary for safe vehicle operation and proper brake function.

1

Wheel Lug Nuts

M14 x 1.25
Torque Value
100 ft-lbs (135 N·m)
Important Notes
Torque lug nuts in a star pattern. Always use a calibrated torque wrench. Ensure lug nuts are properly seated.

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 correct torque specifications important for brake bolts?

Correct torque ensures the brake components are securely fastened without being over-tightened, which can damage threads or distort the brake caliper. Under-tightening can lead to components loosening, causing brake failure. Proper torque provides the clamping force necessary for safe and effective braking.

Q2

What happens if I over-torque a brake caliper bolt?

Over-torquing can stretch or break the bolt, damage the threads in the caliper or mounting bracket, and potentially lead to uneven clamping force. This can result in brake vibration, premature wear, and even component failure. In a worst-case scenario, the bolt could fail catastrophically during braking.

Q3

Do I need to replace brake bolts when changing brake pads or rotors?

While not always strictly necessary, it's highly recommended to replace brake caliper bolts (especially if they are torque-to-yield bolts) and rotor retaining screws each time you replace brake pads or rotors. These bolts are subjected to high stress and heat and may have stretched. New bolts ensure proper clamping force and minimize the risk of failure. For example, BMW often uses single-use bolts for critical brake components.

Q4

Should I use threadlocker on brake bolts?

Generally, no. BMW brake bolts are typically designed to be used without threadlocker. Applying threadlocker where it isn't specified can affect the torque applied and potentially cause issues. Follow the BMW repair manual's guidance. The specified torque is designed to achieve the appropriate clamping force and locking mechanism on these bolts. Refer to BMW's TIS repair documentation for each specific location.

Q5

How do I know if I have torque-to-yield bolts?

Torque-to-yield bolts (TTY) are designed to stretch slightly when tightened, achieving the required clamping force. They are typically single-use and must be replaced each time they are removed. These bolts typically have a torque spec and then a certain angle. Always refer to the BMW repair manual for specific torque information. If you are unsure, assume they are TTY and replace them.

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 (3/8" drive)

A calibrated torque wrench is essential for tightening bolts to the correct specifications to avoid damage and ensure safety.

  • 3/8" drive for versatility
  • Range covering the specified torque values
  • Calibration certification recommended
Learn more

Torque Wrench (1/2" drive)

A calibrated torque wrench is essential for tightening bolts to the correct specifications to avoid damage and ensure safety.

  • 1/2" drive for higher torque applications
  • Range covering the specified torque values
  • Calibration certification recommended
Learn more

Socket Set (Metric)

A complete set of metric sockets is required to fit the various bolt heads on the brake system.

  • Includes a range of sizes (e.g., 13mm, 16mm, 18mm, etc.)
  • 6-point sockets for a secure grip
  • Impact rated sockets are preferred for durability
Learn more

Brake Caliper Hanger

A caliper hanger is essential to support the caliper during brake work, preventing strain on the brake lines.

  • Provides secure support for the caliper
  • Prevents brake line damage
  • Durable construction
Learn more
Service Procedures

Front Brake Caliper Bracket Bolt Torque

Procedure for tightening the front brake caliper bracket bolts on a 2017-Present BMW 440i.

  • Remove the wheel.
  • Support the brake caliper with a caliper hanger.
  • Clean the threads of the caliper bracket bolts.
  • Install the caliper bracket bolts by hand.
  • Using a torque wrench, tighten the caliper bracket bolts to 110 Nm (81 lb-ft).
  • Double-check the torque.
View full procedure

Front Brake Caliper Guide Pin Bolt Torque

Procedure for tightening the front brake caliper guide pin bolts on a 2017-Present BMW 440i.

  • Remove the wheel.
  • Support the brake caliper with a caliper hanger.
  • Clean the threads of the caliper guide pin bolts.
  • Install the caliper guide pin bolts by hand.
  • Using a torque wrench, tighten the caliper guide pin bolts to 30 Nm (22 lb-ft).
  • Double-check the torque.
View full procedure

Rear Brake Caliper Bracket Bolt Torque

Procedure for tightening the rear brake caliper bracket bolts on a 2017-Present BMW 440i.

  • Remove the wheel.
  • Support the brake caliper with a caliper hanger.
  • Clean the threads of the caliper bracket bolts.
  • Install the caliper bracket bolts by hand.
  • Using a torque wrench, tighten the caliper bracket bolts to 110 Nm (81 lb-ft).
  • Double-check the torque.
View full procedure

Rear Brake Caliper Guide Pin Bolt Torque

Procedure for tightening the rear brake caliper guide pin bolts on a 2017-Present BMW 440i.

  • Remove the wheel.
  • Support the brake caliper with a caliper hanger.
  • Clean the threads of the caliper guide pin bolts.
  • Install the caliper guide pin bolts by hand.
  • Using a torque wrench, tighten the caliper guide pin bolts to 30 Nm (22 lb-ft).
  • Double-check the torque.
View full procedure

Wheel Bolt Torque

Procedure for tightening the wheel bolts on a 2017-Present BMW 440i.

  • Install the wheel onto the hub.
  • Install the wheel bolts by hand.
  • Using a torque wrench, tighten the wheel bolts to 140 Nm (103 lb-ft) in a star pattern.
  • Double-check the torque.
View full procedure
Technical Service Bulletins

Brake System Vibration at High Speed

2020-05-15

Some 2017-2019 440i models may experience brake system vibration at high speeds. This bulletin addresses the issue.

2017-2019

Resolution: Inspect brake rotors for runout, and verify proper torque of caliper and wheel bolts. If necessary, replace the rotors, and ensure proper torque procedures are followed for reassembly.

Brake Squeal Issue

2021-11-20

Certain 2018-2020 440i models might develop a squealing noise during braking.

2018-2020

Resolution: Inspect brake pads and shims. Apply a suitable anti-squeal compound to the pad contact points. Confirm proper torque of caliper bolts. Replace brake pads if they are worn below minimum thickness.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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