Heavy truck brakes

SOS Mechanic Certificate - Electrical|Complete Questions with Graded A+ Answers After installing a new battery how long should you wait to allow for pcm time no need to wait As blower motor speed decreases the voltage drop across the resistance block.... increases What should you do first when replacing junction block or fuse? Unlock the battery ground cable The polarity of the voltage applied to the electromagnetic coils of an actual working DC motor is.... a commutator ...

T4 ASE Brakes Exam with complete Graded A+ solutions Psi loss rate for Straight Truck 2 psi/minute Psi loss rate for combination vehicle less than 3 psi/minute Service Brake Pressure Drop Test Apply service brake to 90 psi. Loss rate should be less than 3 psi/minute for straight vehicles and less than 4 psi/minute for combination vehicles. Improperly adjusted brake shoes Cause 1) brake imbalance 2) increased stopping distance 3) excessive heat and wear Instability a...

T4 ASE Brakes Exam with complete Graded A+ solutions Which of the following could cause the brakes on a truck to wear too fast? A. glazed drums B. wrong linings installed C. Low air pressure D. governor cut out pressure B. wrong linings installed which of the following could cause one brake on a truck to wear faster than the others? A. mismatched service brake chambers B. mismatched parking chambers C. low air pressure in service tanks D. governor cut out too low A. mismatched se...

ASE BRAKES Exam #1|Complete Answers Graded A+ A A drum is chattering on the brake lathe. This could be the result of: A. Failure to install the dampening belt. B. Cutting too slowly. C. Dull cutting blades. D. Cutting speed too fast. C A vehicle is equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of the following could be the cause? A. Low brake fluid B. Air in the brake fluid C. Low power steering fluid D. An overtightened power steerin...

ASE S4 Brakes |Complete Questions with Graded A+ Correct Answers The air system is maintained at what pressure? 100 to 120 pounds per square inch. At what pressure does the low pressure switch activate? Below 60 pounds per square inch. A safety or pop off valve is usually installed in which reservoir? In the one closest to the compressor. Why is the Wet tank referred to as such? It is the one closest to the compressor and has the most water in it. What is an after cooler...

SOS brake & braking system Exam|100% Verified PASS!!! In a single anchor bendix drum type rear brake the secondary lining is longer than the primary Compared to the secondary shoe lining areas of drum brakes, the primary shoe lining area is: smaller and goes toward the front of the car During a brake overhaul, you notice that the brake fluid seems to be very dirty and dark in color. What should you do? flush the system before the new parts are installed In order to bleed the s...

Michigan CDL Air Brakes Exam Complete Questions with Graded A+ Correct Answers 3 different braking systems that make up Air Brakes Service Brake, Parking Brake, Emergency Brake Air Compressor Pumps air into storage tanks and connected to the engine via gears or a v-belt. Air Compressor Governor Controls when the air compressor will pump air into the air storage tanks. When tank pressure rises to the cut-out level, the governor stops the compressor from pumping. When the tank pressu...

CDL Air Brakes |Complete Questions with Graded A+ Answers Air loss in a straight truck or bus should not be more than how much PSI with the engine off and the brakes on? 3 PSI in one minute To make an emergency stop with air brakes, using the stab braking method, you should Brake as hard as you can get off brakes when wheels lock get back on brakes when wheels start rolling again All vehicles with air brakes must have what signal? Low air pressure warning signal It is ac...

CDL Air Brakes |Complete Questions with Graded A+ Answers After every working day Oil and water usually collect in compresed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? Why drain water from the compressed air tanks? Water can freeze in cold weather and cause brake failure. The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi per minute with the engine off and the brakes released. 2 ...

Michigan Airbrake CDL Test |Complete Questions with A+ Graded Answers The air brake system on a commercial motor vehicle is comprised of three separate systems. Can you name them? Service, Parking, Emergency brake system How often should the air tank be drained in the air brake system? If it is a manual drain valve, it should be drained of water and contaminants at the end of every day's driving. At what PSI does the air compressor "cut out"? The air compressor will shut down or...