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Technical Bulletins

Raybestos offers technical bulletins that cover various brake conditions that are known to occur in vehicles. These bulletins can help you troubleshoot a problem when a vehicle is in your shop and help you find a solution.

In each technical bulletin, you will find the following information:

  • Subject line
  • Vehicle(s) Involved
  • Condition
  • Repair Procedure

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20-01: Pedal Pulsation Caused by Moisture Buildup

A discussion of how excessive moisture build-up can lead to a pedal pulsation over time. 

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19-05: Brake Fluid Contamination

How mistakenly putting petroleum-based fluid in your master cylinder can cause problems with your brake system. 

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TB 19-04: Intensive Wheel Hub Cleaning Process

A discussion about why cleaning wheel hubs is so important during a brake job, and what tools can help with extremely rusty hubs.

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TB 19-03: Low Brake Pedal Caused by Bad Wheel Bearing

A discussion about how a low brake pedal may not always be caused by a problem in the hydraulic system. 

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TB 19-2: Brake Booster Checks and Tests

Troubleshoot a hard brake pedal with these brake booster checks and tests. 

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TB 19-1: Brake-Noise-Discussion

How to properly identify brake noises and know what’s causing them.

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TB 18-18: Brake Hose Inspection Checklist

How to properly inspect a brake hose both internally and externally. 

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TB 18-17: Pedal Pulsation Causes

A discussion about the cause of pedal pulsation and how to fix it. 

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TB 18-16: Floating Caliper vs. Fixed Caliper Operation

A discussion on how a fixed caliper operates vs. a floating caliper. 

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TB 18-15: Diagnosing a Low Brake Pedal with an Isolation Test

How to perform an isolation test/line lock test to properly diagnose a spongy brake pedal.

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TB 18-14: Removing a Rear Rotor Stuck on the Parking Brake

A discussion about how to remove a rear drum-in-hat rotor that is stuck on the parking brake. 

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TB 18-13: Brake Pad Wear Sensors Discussion

A discussion about the different types of brake pad wear sensors. 

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TB 18-12: The Importance of Torquing Lug Nuts

A discussion about the problems that can occur if lug nuts aren't torqued evenly and to specifications. 

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TB 18-11: Inspect and Clean Caliper Brackets

A discussion about how to properly inspect and clean a caliper bracket to avoid brake noise, brake pull and/or premature/uneven pad wear. 

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TB 18-10: Clogged Brake Hose

A discussion about how overheated brakes, brake drag or premature brake wear can actually be caused by a clogged brake hose as opposed to a problem with the caliper. 

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TB 18-09: Multiple Hardware Kits with Brake Pads

A discussion about how to identify the correct hardware for your application when multiple hardware kits come in the box with your brake pads. 

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TB 18-08: Drum Brake Hardware Discussion

Discussing the different types of rear brake hardware, what their function is and why it is always important to replace drum brake hardware during a rear brake job. 

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TB 18-07: Ford Focus Part #9759 Rear Brake Drum Replacement

A discussion about the proper replacement procedure for a 2000-2008 Ford Focus rear brake drum.

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TB 18-06: Brake Job Tools

Discussing the tools you need to perform a quality brake job. 

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TB 18-05: Installing Brakes That Use Drag Reduction Clips

How to use a C-clamp to install brakes that use drag reduction clips. 

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TB 18-04: Properly Remove a Caliper You Are Reusing

How to properly remove a caliper during a brake job when the caliper is OK to reuse. 

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TB 18-03: Preventing a Frozen Brake Cable

Condition: Parking Brake Cable is Frozen

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TB 18-02: Frozen Wheel Cylinder

How to figure out if a frozen wheel cylinder is the cause of rapid front brake wear/a loss of braking. 

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TB 18-01: Checking Caliper Piston Operation

How to properly inspect a caliper piston's operation to ensure the square cut seal is working properly. 

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Master Cylinder Fluid Levels

A discussion about what to do if the brake fluid levels in your master cylinder reservoir are too high or too low. 

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Inspecting Brake Fluid

A discussion about inspecting your brake fluid, testing your brake fluid for moisture content and diagnosing the cause of low fluid levels. 

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Comparing Different Types of Brake Fluid

A discussion about the different types of brake fluid and their distinguishing characteristics. 

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ABS light on or false ABS activation after wheel bearing hub replacement

What to do when the ABS light is on or there is a false ABS activation after a wheel bearing hub replacement.

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Intermittent Brake Pull

How to diagnose and correct the cause of brake pull.

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Rotor looks to have “hot spots” on surface

A discussion about “hot spots” on a rotor's surface. 

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Safety issues using lightweight rotors

A discussion about the safety issues of using lightweight rotors. 

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Checking Rotor Runout Correctly

How to properly check rotor runout. 

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Electrical Circuit Repairs and Replacing Components

How to repair or attach a wire to a circuit. 

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Brake Pedal Pulsation 2-4,000 miles after brake service

A discussion about the cause of brake pedal pulsation 2-4,000 miles after brake service.

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Importance of On-Vehicle Brake Lathe Use

A discussion about the importance of on-vehicle brake lathe use. 

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Electrical Circuit Repairs

A discussion about electrical circuit repairs.

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Low-Sinking or Spongy Brake Pedal

How to fix a low-sinking or spongy brake pedal. 

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Hard braking when cold, lack of power assist

How to fix hard braking/lack of power assist in cold weather. 

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Slow speed ABS false modulation

How to fix slow speed ABS false modulation on SUVs and Light and Medium Duty Trucks. This is a revision of bulletin 02-02.

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Brake Noise, Vibration and Harshness

A discussion about brake noise, vibration and harshness

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Brake Pad Burnishing

 Brake Pad Burnishing on Severe Duty Applications

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Hybrid Vehicle Safety Precautions

A discussion about the safety precautions you need to take before servicing a hybrid vehicle.

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Master cylinder bench bleeding

How to bench bleed a step bore master cylinder. 

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Testing Magneto Resistive Wheel Speed sensor

How to troubleshoot the magneto resistive wheel speed sensor.

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Brake hose restriction

How to identify brake hose restriction. 

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Brake Pad puck (lining) Shearing

A discussion about the causes of brake pad puck (lining) shearing. 

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Proper Use of Brake Pad lubricants

How to properly use brake lubricants.

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Friction technology

A discussion about the development, refinement and implementation of Raybestos friction technology. 

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Cleaning Rotors

How to properly clean a new or machined rotor before installation. 

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Pressure Bleeders

How to purge air and contaminates from a hydraulic system with a pressure bleeder.

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Caliper Service

A discussion about the features and benefits of rebuilt calipers. 

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Noise / Brake pull / Pulsation complaints could be related to bearing failure:

How noise, brake pull and/or pulsation could be caused by bearing failure and how to identify it.

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Brake Pulsation

A discussion about the cause of pedal pulsation. 

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Calibration of Bench-Type Lathes

How to calibrate a bench-type brake lathe. 

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Rotor Lateral Runout Specifications

How to check the lateral runout on a rotor. 

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Brake Lubricant, what to use and where

A discussion about brake lubricant, including what to use and where to use it. 

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Variable reluctance Wheel Speed Sensors

A discussion about variable reluctance wheel speed sensors. 

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Passive and Active wheel speed sensors

A discussion about passive and active wheel speed sensors.

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Torque limiting sockets (torque stick)

A discussion about torque limiting sockets (torque sticks).

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Pedal pulsation after brake service

How to fix lateral runout causing pedal pulsation one to 12 thousand miles after a brake service. 

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Low/Spongy Brake Pedal Causes

How to diagnose the cause of a low/spongy brake pedal with an isolation test. 

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Braking Principles

A discussion about the basic principles of braking. 

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Ceramic Brake Pads

A discussion about ceramic brake pads. 

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Easy Rear Drum Brake Service

A quick tip that makes service to rear drum brakes easier.

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Rotors and pads determine Brake Operating Temperature

How to maintain a safe brake temperature.

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Minimizing Brake Dust on wheels

How to minimize brake dust on wheels. 

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Voltage Drop Tests

A discussion about voltage drop tests.

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Source voltage

How to see if low source voltage is causing your ABS system to malfunction. 

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RWAL/RABS Valves Restricting Fluid Flow To The Rear Brakes

How to diagnose if the RWAL/RABS valves are restricting fluid flow on Kelsey Hayes rear wheel ABS systems.

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On-The-Car Brake Lathe

A discussion about on-the-car brake lathes.

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Digital Volt OHM Meters

A discussion about digital volt-ohm meters (DVOM) and its importance in diagnosing electrical and electronic problems.

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Brake Pulsation front or rear?

How to determine if brake pulsation is coming from the front or rear in vehicles with four-wheel disc brakes. 

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Brake Fluid Integrity

A disussion about how brake fluid can cause corrosion in your hydraulic system over time. 

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Infrared Thermometer used to evaluate brake system efficiency

A discussion about infrared thermometers and how they are used to evaluate brake system efficiency.

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Brake Service Lubrication Disc & Drum Applications

A discussion about lubrication and where to locate lubrication points.

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Resurfacing Drilled and Slotted Performance Rotors

How to resurface drilled and slotted performance rotors. 

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Brake Rotor Lateral Runout Correction Plates

How to fix rotor lateral runout with correction plates. 

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Brake Lathe Maintenance Tips

Tips on brake lathe maintenance. 

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ABS Equipped Vehicles / On car Lathe

How to use an on-car lathe with ABS-equipped vehicles. 

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Manual Transmission Clutch Replacement Concerns

A discussion on the concerns surrounding manual transmission clutch replacement.

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Misleading ABS Codes from Improper Voltage

How improper voltage can lead to misleading ABS codes.

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Sanding Drums and Rotors

A discussion on why sanding drums and rotors is NOT recommended. 

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Slow speed ABS false modulation

How to resolve slow-speed ABS false modulation.

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Disc brake squeal after brake reline

How to diagnose the problem of disc brake squeal after brake reline. 

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Quick check for rear brake shoe contact area

How to do a quick check for rear brake shoe contact area.

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Dragging brakes on lifted trucks

How to fix brake drag on lifted trucks. 

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Non-Ferris Ceramic Brake Pads Originally Equipped or Back

A discussion about non-ferris ceramic brake pads.

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Wheel Speed Sensor Testing

Test procedures for wheel speed sensor testing. 

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Brake Bleeding

A discussion about brake bleeding.

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High Performance/Fleet duty Rotors

How to resurface high performance/fleet duty rotors.

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Low brake pedal isolation procedure

How to perform an isolation test when you have a low brake pedal.

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Lubricating Brake Components

A discussion about brake lubricants.

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Brake Bleeding Methods

A discussion about the three most common methods used to bleed brakes. 

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Problems Cause by Corrosion on Calipers

A discussion about how corrosion on your calipers can cause problems with your brake system. 

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Problems Caused by Corrosion on Rotors

A discussion about how corrosion on your rotors can cause problems with your brake system. 

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