Check Brake Pad Wear Indicator Burnish Pads
Check Brake Pad Wear Indicator Burnish Pads
Check Brake Pad Wear Indicator Burnish Pads
Program:
Introduction/Contex This lesson will introduce students to the proper way to check brake pad wear
t
indicator, determine necessary action, and to describe importance of operating
vehicle to burnish/break-in replacement brake pads according to manufacturers
recommendations.
Prepared By
School
Grade Level
No. Students
No.
Date:
No.IEP's:
Lesson
Length:
Task
Check brake pad wear indicator; determine necessary action: Describe importance of operating
vehicle to burnish/break-in replacement brake pads according to manufacturers recommendations.
No.
1
Objective
Given a vehicle with front disc brakes, the students will be able to check brake pad wear indicator;
determine necessary action, plus describe importance of operating vehicle to burnish/break-in
replacement brake pads according to manufacturers recommendations. Students will also be able
to pass a written exam on the task with 100% accuracy.
Connections:
Skills Standards:
OH 001
OH 002
OH 003
OD 002
OD 003
OD 005
New Common Core Standards:
RST 11-12 3
Common Core Technical Standards:
TD-OPS 2
TD-SYS 2
INSTRUCTIONAL MATERIALS/TECHNOLOGY
Textbooks and Workbooks
Author
Title/ISBN No.
Edition
Publisher
Duffy
2004
Goodheart, Wilcox
Various
2013
Delmar
Pages
31-36
Web Addresses
Title
Publisher
URL
www.howstuffworks .com
Supplies
Quantity
Item
Source
12 Cans
10
NAPA
Content/Presentation/Demonstration Outline
Instruct students that a scraping or squeaking noise while braking may be caused by a pad wear sensor
contacting the rotor. Let them know that the scraping of the wear indicator indicates that the brake pads
need replacement. Explain that if caught early, minimal damage will be done to the rotors. Tell them to
remember that when resurfacing or replacing the rotors, the axle set must be either replaced together or
have the same amount of machining done.
Inform students that shop manuals usually specify minimum pad thickness, but the pads can only be
measured if the unit is disassembled. Tell them to be sure and inspect disc brake rotors whenever the
pads or calipers are serviced, or when the wheels are rotated or removed for any other work.
Tell students that after removing the brake pads from the brake caliper, they should clean and inspect the
brake pads, hardware, anti-rattle clips, and springs. Instruct them to measure disc-pad lining and
compare with manufacturers specification, and check for tapered wear or cracked linings.
Instruct students that if they replace the pads, they should road test the vehicle while checking for things
like incorrect pedal height, pulling while braking, pulling after breaking, and any abnormal noises. If any
of these are present, further diagnosis and repair will be necessary.
Explain that friction material needs to be seated to the matching rotor after pad replacement or
machining the rotors, and this break-in process is known as burnishing. Tell student that burnishing
shapes the friction material to the shape of the rotor, which allows for better stopping. Let them know that
the heat generated by this process will also cure the resins and other materials used to make up new
pad lining.
Instruct students that failure to burnish newly replaced pads could result in a customer complaint of a
hard brake pedal and/or reduced vehicle braking. Tell students that to seat disc brake pads to the rotor,
make approximately 20 complete stops from 30 MPH, or slow down from 50 MPH to 20 MPH the same
number of times with light to medium pedal pressure. They should then allow at least a 30 second cool
down period between brake applications to prevent overheating. Instruct them that while performing this
procedure, panic/hard stops, which would result in glazed pads, should be avoided. After a thorough
burnishing procedure, tell students it is normal to see smoke coming from new brake pads.
Applications/Practice
1
Students can practice these tasks by doing an in-depth inspection of disc brakes on a vehicle. This
includes removing, inspecting, and cleaning disc pads, calipers, and any mounting hardware.
Objective 1/ Summative assessment / written test questions on stated objective / adaptation and/or
accommodations for special needs students will be added if required.
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students progress in relation to the
state objectives? Was the instruction successful? Analyze samples of student work particularly that which
is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial
planning and/or during the teaching learning process.)