AUT 154-155Maintenance and Light Repair Section C

Clean and inspect rotor, measure rotor thickness, thickness variation, and lateral runout; determine necessary action. Lesson Plan for AUT 154-155 Maintenance and Light Repair Section C Course HS Title: Maintenance and Light Repair Program: KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.) KCTCS Course No. KCTCS Course Title

Introduction/Context This lesson will introduce students to the proper procedures needed to clean and inspect rotor, measure rotor thickness, thickness variation, and lateral runout, and determine necessary action.. Students will determine whether the rotor can be machined or needs to be replaced. Prepared By School Date:

Lesson Grade Level No. Students No.IEP's: Length:

Task Clean and inspect rotor, measure rotor thickness, thickness variation, and lateral runout; determine necessary action.

No. Objective Given a vehicle with disc brakes, Students will be able to clean and inspect rotor, measure rotor 1 thickness, thickness variation, and lateral runout, determine necessary action, and 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 G-MG-1 N-Q.1 Common Core Technical Standards: TD-OPS 2 TD-SYS 2 INSTRUCTIONAL MATERIALS/TECHNOLOGY

Textbooks and Workbooks Author Title/ISBN No. Edition Publisher Pages Duffy Modern Automotive Technology 2004 Goodheart, Wilcox 1390-1391 Various Brakes ASE Test Prep 2013 Delmar 33

Equipment Quantity Item Source 5 Disc Micrometers (Metric & Standard) Snap-On 5 Dial Indicator w/Brackets Snap-On

Content/Presentation/Demonstration Outline Instruct students to remove the disc brake rotor, clean and inspect for damage. Have them check for pitting, grooves, heat cracks, or damage on the friction surface of the brake rotor. Inform students that blue spots on the rotor face indicate excessive heat. Tell them to replace the rotor if there is cracking. Instruct students to measure brake rotor thickness prior to any other rotor repairs. This should be done to make sure the rotor has enough thickness to be serviced. If rotor does not meet minimum thickness requirements, let them know it should be replaced without any further measuring. Teach students that rotor thickness is measured across the two friction surfaces. An outside micrometer should be used for this measurement. Tell them that measurements should be taken at several different positions around the rotor. Variations in their measurements indicate would indicate wear and a need for repair. Tell them to consult the service manual for minimum thickness specification and compare to your smallest measurement. Explain that rotor runout refers to the parallelism of the disc. Before checking lateral runout, explain that if composite rotors are used, they should remove the rotor and clean the back of the rotor and hub surface. This will eliminate any rust or debris that could alter readings. To check runout, tell students to mount a dial indicator to a solid surface. Runout is measured on the outer edge of the friction surface using a dial indicator. Have them mount a dial indicator to the steering knuckle using brackets supplied with dial indicator unit. Tell students to position the dial indicator on the outer edge of the rotor’s friction surface. Instruct them to zero the dial indicator, and slowly rotate the rotor while observing the dial indicator for the maximum runout. Let them know to not forget to add any value below zero that was indicated on the dial. Inform them to consult the service manual for rotor runout specifications. If runout is excessive, let them know that the rotor can sometimes be indexed on the hub to match high spots on the rotor with low spots on the hub. This may allow for runout to be within spec. Some aftermarket companies manufacture shim kits to correct lateral runout. Explain that shims with different thicknesses can be installed between the rotor and hub to correct lateral runout. Instruct students to determine what repair procedure is needed for the rotor using the rotor thickness and runout measurements. Tell them that if the disc rotor is not worn beyond specification, truing (or machining) can be performed. Machining the brake rotor involves the use of a brake lathe, which cuts both sides of the rotor in order to produce an even, smooth friction surface. Let them know that disc rotors must be machined in pairs to ensure smooth and even braking. If the rotor does not meet minimum thickness requirements it must be replaced. After machining, tell them to make sure rotor thickness is still within specification. Applications/Practice Students will practice this task by measuring a rotor and comparing their measurement to the 1 specifications in the service manual.

Evaluation and feedback Prior to Testing or Lab Work Objective 1/ Formative assessment / Instructor will observe students as they practice the procedure to assure correct procedure and safety practices are being followed. A checklist should be utilized to chart student progress on the task. Questioning techniques will be utilized as necessary to demonstrate student comprehension / Adaptations and/or accommodations for special needs students will be added if required.

STUDENT ASSESSMENT: (Assess student progress with performance criteria.) 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.)