Mercedes-Benz Mercedes CLA 2013-2019 Brake System Bolt Torque Specifications & Fastener Values
Mercedes-Benz Mercedes CLA 2013-2019

Mercedes-Benz Mercedes CLA 2013-2019 Brake System Bolt Torque Specifications

Detailed torque specifications for brake components on the 2013-2019 Mercedes-Benz CLA, including caliper bolts, rotor bolts, and brake line fittings.

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

Brake Caliper System

This subsystem includes components related to the brake caliper, mounting bracket, and associated hardware. Proper torque ensures secure attachment and alignment of the caliper and brake pads relative to the rotor.

1

Brake Caliper Bolts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Ensure caliper is properly aligned before torquing.
2

Brake Caliper Mounting Bracket Bolts

M14 x 1.5
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Ensure bracket is seated properly before torquing.

Brake Rotor Drum System

This subsystem includes components related to the brake rotor or drum and their attachment to the wheel hub. Proper torque ensures secure attachment and prevents vibration or uneven braking.

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Ensure rotor/drum is seated properly before torquing.

Brake Hydraulic System

This subsystem includes components related to the brake hydraulic system, such as the brake hose banjo bolt and master cylinder. Proper torque ensures leak-free connections and consistent brake pressure.

1

Brake Hose Banjo Bolt

M10 x 1.0
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure sealing washers are properly installed.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Ensure master cylinder is properly aligned before torquing.

Brake Booster Pedal System

This subsystem includes components related to the brake booster and pedal assembly. Proper torque ensures secure attachment and consistent brake pedal operation.

1

Brake Booster Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Ensure booster is properly aligned before torquing.
2

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure pedal assembly is properly aligned before torquing.

Wheel Attachment System

This subsystem includes components related to the wheel attachment, such as lug nuts. Proper torque ensures secure attachment of the wheel and rotor.

1

Wheel Lug Nuts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Torque lug nuts in a star pattern to ensure even clamping force.

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 torque specification for the brake caliper bolts on a 2013-2019 Mercedes CLA?

The brake caliper bolts on a 2013-2019 Mercedes CLA typically require a torque of 80 Nm (59 lb-ft). Always refer to the vehicle's service manual for the exact specifications, as variations may exist depending on the model and 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 every brake service or tire rotation. Additionally, recheck the torque after driving 50-100 miles post-service to ensure bolts remain secure.

Q3

Can I reuse brake caliper bolts, or should they be replaced?

Brake caliper bolts are often designed for single use due to the high stress they endure. Reusing them can lead to failure or improper torque. Always replace them with new bolts during brake service unless the manufacturer explicitly states they are reusable.

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 for applying specific torque values to bolts.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Brake Caliper Piston Tool

A tool designed to compress brake caliper pistons during brake pad replacement.

  • Compatible with various caliper designs
  • Durable construction
Learn more

Hex Socket Set

A set of hex sockets for removing and tightening brake system bolts.

  • Multiple sizes included
  • Durable chrome vanadium steel
Learn more
Service Procedures

Front Brake Caliper Bolt Torque Specification

Procedure for applying the correct torque to front brake caliper bolts.

  • Lift the vehicle and remove the front wheels.
  • Locate the front brake caliper bolts.
  • Use a torque wrench and hex socket to tighten the bolts to 85 Nm (63 lb-ft).
  • Reinstall the wheels and lower the vehicle.
View full procedure

Rear Brake Caliper Bolt Torque Specification

Procedure for applying the correct torque to rear brake caliper bolts.

  • Lift the vehicle and remove the rear wheels.
  • Locate the rear brake caliper bolts.
  • Use a torque wrench and hex socket to tighten the bolts to 85 Nm (63 lb-ft).
  • Reinstall the wheels and lower the vehicle.
View full procedure

Brake Disc Retaining Screw Torque Specification

Procedure for applying the correct torque to brake disc retaining screws.

  • Remove the wheel to access the brake disc.
  • Locate the brake disc retaining screw.
  • Use a torque wrench and appropriate bit to tighten the screw to 4 Nm (35 lb-in).
  • Reinstall the wheel.
View full procedure
Technical Service Bulletins

Brake Caliper Bolt Loosening Issue

2017-05-12

Reports of brake caliper bolts loosening over time, leading to noise and reduced braking performance.

2013-2017 Mercedes CLA

Resolution: Ensure proper torque application during installation and use thread-locking compound as recommended.

Brake Disc Retaining Screw Corrosion

2018-08-22

Corrosion of brake disc retaining screws causing difficulty during removal.

2013-2019 Mercedes CLA

Resolution: Apply anti-seize compound to the threads during installation to prevent future corrosion.

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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