Buick LaCrosse 2017-2019 Brake System Bolt Torque Specifications & Fastener Values
Buick LaCrosse 2017-2019

Buick LaCrosse 2017-2019 Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2017-2019 Buick LaCrosse, including caliper bolts, bracket bolts, and rotor 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

Front Brake Calipers

Specifications for the front brake caliper, mounting bracket, and related components. This includes the caliper guide bolts and mounting bracket bolts.

1

Brake Caliper Guide Bolts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Lubricate guide bolts with brake caliper grease before installation. Ensure the caliper slides freely on the guide pins.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure mounting surfaces are clean and free of debris. These bolts secure the bracket to the steering knuckle.
3

Brake Line Fitting to Caliper

M10 x 1.0 Banjo Bolt
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Use new sealing washers for proper sealing. Over tightening may damage the fittings or lines. Torque is estimated, always refer to specific service documentation

Rear Brake Calipers

Specifications for the rear brake caliper, mounting bracket, and related components.

1

Brake Caliper Guide Bolts

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Lubricate guide bolts with brake caliper grease before installation. Ensure the caliper slides freely on the guide pins.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure mounting surfaces are clean and free of debris. These bolts secure the bracket to the steering knuckle or axle carrier.
3

Brake Line Fitting to Caliper

M10 x 1.0 Banjo Bolt
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Use new sealing washers for proper sealing. Over tightening may damage the fittings or lines. Torque is estimated, always refer to specific service documentation

Brake Discs

Specifications for securing the brake disc/rotor to the wheel hub.

1

Brake Disc/Rotor Retaining Bolts/Screws

M6 x 1.0
Torque Value
0.74 ft-lbs (10 N·m)
Important Notes
These bolts secure the rotor to the hub for assembly purposes only. These bolts are not load bearing. Torque is estimated, always refer to specific service documentation

Wheel Nuts

Specifications for securing the wheels to the vehicle.

1

Wheel Lug Nuts

M14 x 1.5
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Tighten lug nuts in a star pattern for even clamping. Re-torque after the first 50-100 miles of driving.

Brake Hydraulics

Specifications for critical hydraulic components including brake lines, master cylinder, and bleeder valves.

1

Brake Line Fittings to Brake Hoses or Hardlines

Various Flare Nut Sizes (Estimate: M10 x 1.0)
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Ensure fittings are properly aligned and clean to avoid cross threading. Use a flare nut wrench to avoid damaging the fittings. Torque is estimated, always refer to specific service documentation
2

Brake Master Cylinder Mounting Nuts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the master cylinder is properly seated against the firewall. Torque is estimated, always refer to specific service documentation.
3

Brake Booster Mounting Nuts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure the brake booster is properly seated against the firewall. Torque is estimated, always refer to specific service documentation.
4

Bleeder Valve

M7 x 1.0
Torque Value
0.74 ft-lbs (10 N·m)
Important Notes
Typically hand tightened but may need a slight torque to seal. Torque is estimated, always refer to specific service documentation

Parking Brake

Specifications for the parking brake system components.

1

Parking Brake Cable Mounting Bracket Bolts

M6 x 1.0
Torque Value
0.74 ft-lbs (10 N·m)
Important Notes
Ensure the bracket is properly aligned before tightening. Torque is estimated, always refer to specific service documentation.

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 when working on my Buick LaCrosse's brakes?

Using the correct torque ensures proper clamping force on brake components. Over-tightening can damage bolts, threads, or even warp rotors, while under-tightening can lead to loosening, component failure, and loss of braking ability. For example, if a caliper bracket bolt isn't torqued properly, the caliper could shift under braking, causing uneven pad wear and potential loss of control.

Q2

What happens if I don't have a torque wrench?

While it's strongly recommended to use a torque wrench, not having one increases the risk of improper fastening. If you must proceed without one, use caution and tighten bolts firmly, but without excessive force. If possible, borrow a torque wrench, or have a professional mechanic do the work. Improperly torqued brakes are a major safety concern. A good rule of thumb is to tighten to 'snug' and then a bit further, but there is no substitute for a torque wrench. Consider that improper tightening can mean the difference between a safe stop and an accident, which can result in considerable vehicle damage and/or personal injury.

Q3

Do I need to replace bolts when working on the brakes?

Generally, it is recommended to replace caliper bracket bolts if the manufacturer specifies them as 'torque to yield' (TTY). Most of the bolts on the Buick LaCrosse brake assembly are *not* TTY, meaning they can be reused unless they are damaged, but always consult a repair manual or online database. If the bolt head is rounded or damaged in any way, always replace it.

Q4

How often should I inspect my Buick LaCrosse's brakes?

You should inspect your brakes every time you rotate your tires, or at least every six months or 6,000 miles, whichever comes first. Check for wear on pads, rotors, and any unusual noises. If you hear squealing, grinding, or experience vibrations during braking, have your brakes inspected immediately.

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 applying the correct torque to brake components.

  • Ability to measure torque in foot-pounds (ft-lbs) or Newton-meters (Nm)
  • Wide torque range to accommodate different bolt sizes
  • Audible click or digital display to indicate when the target torque is reached
Learn more

Socket Set

A set of sockets in various sizes is necessary to fit the different bolts used in the brake system.

  • Includes sockets in metric sizes
  • 6-point or 12-point sockets for secure grip
  • Variety of drive sizes (1/4", 3/8", 1/2")
Learn more

Wrench Set

A wrench set can be used to hold a bolt head in place while torquing from the other side.

  • Includes wrenches in metric sizes
  • Open-end and box-end wrenches for different applications
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Procedure

Procedure for torquing front brake caliper mounting bolts.

  • Locate the front brake caliper mounting bolts.
  • Using the correct size socket, install the bolts and tighten them by hand.
  • Set the torque wrench to the specified torque setting (refer to specifications below)
  • Torque each bolt to the specified value in a cross pattern.
  • Double check torque on all bolts.
View full procedure

Rear Brake Caliper Bolt Torque Procedure

Procedure for torquing rear brake caliper mounting bolts.

  • Locate the rear brake caliper mounting bolts.
  • Using the correct size socket, install the bolts and tighten them by hand.
  • Set the torque wrench to the specified torque setting (refer to specifications below)
  • Torque each bolt to the specified value in a cross pattern.
  • Double check torque on all bolts.
View full procedure

Brake Rotor Mounting Bolt Torque Procedure

Procedure for torquing the brake rotor mounting bolt.

  • Locate the brake rotor mounting bolt.
  • Using the correct size socket, install the bolt and tighten it by hand.
  • Set the torque wrench to the specified torque setting (refer to specifications below)
  • Torque the bolt to the specified value
  • Double check torque on the bolt.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Corrosion Issues

2018-05-15

Some vehicles may experience premature corrosion of brake caliper bolts due to road salt and moisture exposure. This can lead to reduced clamping force and potential brake issues.

2017-2019

Resolution: Inspect the bolts for corrosion and replace as necessary. Apply anti-seize compound to bolt threads before installation and torque to specification.

Rear Brake Noise During Low Speed Application

2019-02-20

A low-speed squealing noise may occur from the rear brakes due to the rotor mounting bolts being loose. Ensure the correct torque is applied.

2018-2019

Resolution: Inspect the torque on rear rotor mounting bolts, ensure they are tightened to the specified torque. Replace if damaged.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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