ASE A5 Exam: Questions & Answers (Brakes): Latest Updated A Plus Guide Solution

Technician A says that any imperfection found in a phenolic caliper piston warrants replacement. Technician B says that a phenolic caliper piston should be protected with a block of wood when installing it into the caliper bore with a C-clamp. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B (> - The correct answer is B. A phenolic piston should be protected to keep it from being damaged when a C-clamp is used. Technician A is wrong because minor surface imperfections are OK provided they do not enter the dust boot groove area. Which of the following should be used to measure the thickness of a scored rotor? A. Vernier caliper B. Outside micrometer with flat anvil and spindle C. Inside micrometer D. Outside micrometer with pointed anvil and spindle (> - The correct answer is D. AN outside micrometer with a pointed anvil and spindle is a disc brake micrometer. unlike a standard micrometerthat uses a flat surface on the anvil and spindle, a disc brake micrometer uses pointed tips so the instrument can fit into the groves of scored rotors, to accurately measure the thickness. During a routine vehicle maintenance, the fluid level in the master cylinder reservoir is checked. When the reservoir cap is removed, purple colored fluid is found in the reservoir. Technician A says that this means the fluid should be topped off with DOT 4, which has a higher boiling point than regular brake fluid. Technician B says that this means that the fluid is contaminated; all rubber parts in the system must be replaced and the system flushed. Who is right?