Technician A says front-wheel drive cars can have a very low braking ratio at the front wheels. Technician B says front-wheel drive cars can have a very high braking ratio at the front wheels. Who is right? Define braking ratio:Comparison of the front wheel braking effort to the rear wheel braking effort How much braking power do the front wheel brakes handle? 60%-70%. The __ is a lever arm to increase the force applied to the master cylinder piston. Brake pedal assembly What is a master cylinder? Hydraulic piston pump that develops pressure for the brake system What would be needed to slow and stop the vehicle if both primary and secondary hydraulic systems failed? Mechanical brakes A __ is used when a single brake line must feed two wheel cylinders. Junction block A(n) __ is a vacuum- or power steering-operated device that assists brake pedal application. Brake booster Which of the following is used for brake lines?Metal tubing Rubber hose Technician A says Hydro-boost power brakes are commonly used with vehicles equipped with diesel engines. Technician B says some gasoline powered vehicles also use Hydro-boost systems. Who is right? What are the two organizations that write specifications for brake fluid?SAE and DOT Technician A says newer vehicles use brake pad linings made of heat- resistant organic or semi-metallic friction materials. Technician B says newer vehicles use pad linings made of asbestos. Who is right? All of the following are parts of a disc brake assembly Caliper. Brake pads. Rotor. What are brake pads? Friction surfaces with metal backing pushed against a rotor. Technician A says a wheel cylinder assembly houses a hydraulic piston that is forced outward by fluid pressure. Technician B says a brake drum rubs against brake shoes to stop or slow wheel rotation. Who is right? Technician A says when the driver pushes on the brake pedal, lever action pushes a rod into only the brake booster. Technician B says it also continues pushing into the master cylinder. Who is right? The emergency brake system uses _______________ to apply the rear brakes? Cables and rods Power brakes use a __ to assist brake pedal application. booster The __ master cylinder has two separate hydraulic pistons and two fluid reservoirs. Dual Technician A says in the dual master cylinder, the rear piston assembly is called the primary piston. Technician B says the front master cylinder piston is termed the secondary piston. Who is right? A(n) __ uses power steering pump pressure to help the driver apply the brake pedal. Hydraulic booster Technician A says the secondary brake shoe has the shorter lining. Technician B says the primary shoe has the shorter lining. Who is right? The brake shoes are drawn tighter against the drum by __ .self-energizing action Brake __ and __ transfer fluid pressure from the master cylinder to the wheel brake assemblies. Lines. hoses How are linings attached to brake shoes? Rivets Bonding agent All of the following are true about brake discs,it may be solid or vented. the ventilated rib disc is hollow.it may be an integral part of the wheel hub. The __ is included in a brake caliper assembly. piston seal 8. __ are frequently used to keep the brake pads from vibrating and rattling. Anti-rattle clips Why is a pad wear sensor sometimes used?Inform the driver the pads are worn Why are floating and sliding calipers used?To avoid vibrations Technician A says the sliding caliper uses more than one piston. Technician B says the fixed caliper disc brake is a one-piston caliper. Who is right? The backing plate holds all of the following drum brake components, shoes. wheel cylinder. springs. What happens in a dual master cylinder if there was pressure loss in the primary section of the brake system. The primary piston slides forward and pushes on the secondary piston What are three desirable properties of brake fluid? Low freezing point, viscous, low water absorbency Technician A says that the chassis of an automobile typically includes everything but the body. Technician B says that the chassis is just another name for the vehicle's body. Who is right? Which of the following are used to support a vehicle after it has been raised? Jack stands. A cutting torch generates tremendous heat by burning ____ and acetylene gas. oxygen Which of the following statements about a series circuit is true? It has only one path for current flow. An automotive ____ is a group of related parts that perform a specific job. System The radiator of a vehicle is part of its ____ system.cooling Which of the following is not one of the safety rules that apply when working with gasoline?Soak up any spills with an oil absorbent. Which of the items listed below is not a potential explosion hazard?Oil pan. An air bag is being replaced in a vehicle. Technician A says that the bag should be carried with the metal housing pointing downward. Technician B says the metal housing should be pointed away from your body. Who is right? Which type of tire has the most stable footprint? Radial ply. The relationship of tire height to its width is called its ____. aspect ratio What personal protection should you use when working with corrosive chemicals? Eye, hand and respirator protection According to the ‚fire triangle‛, which element do you need to remove to extinguish a fire?Oxygen and heat Exhaust gases in the workshop are a serious health hazard. The best way to get rid of these gases is Attach a pipe that vents the gasses away from your work area Technician A says that the tires can still be used for a long time once the tread wear indicates appear as a solids line across the tire, however, Technician B says that the tires should be changed as soon as possible from this point. Who is correct? Technician A says that all vehicles are provided with a spare tire even if it is only a temporary one, however, Technician B says some car are not provided with spare tire at all. Who is correct? The MSDS should always be Clearly visible and located near where the product is stored When working in the automotive shop, safety glasses should be worn As soon as you step onto the shop floor The recommended footwear for the automotive shop is Hard leather shoes. The leading cause of lost work time in the automotive shop is Back injuries When working under a car that has been raised on floorjack, Technician A says to make sure the jack is centered. Technician B says always use jackstands. Who is correct? Blow guns are useful tool for NOT Blowing dust off brake shoe or Spin drying wheel bearings The correct safety practice for handling spills is to Wipe them up immediately. Dirty shop rags should be Stored in the proper container. Technician A says impact wrenches should be kept oiled and the air lines free of moisture. Technician B says only impact sockets should be used with impact wrenches. Who is correct? When checking a tire for damage do a visual inspection run your hands around the edges of the tire be careful of steel wires protruding from the rubber When removing a tire from a wheel, Technician A says to remove the Schrader valve first to deflate the tire. Technician B says to remove the Schrader valve after both beads have been broken. Who is correct? When using a hydraulic press, you should make sure the part is secure and parallel to the work platform keep your face away from the part being pressed wear safety glasses A tire with an aspect ratio of 45% is A low profile tire Technician A says that Tire markings now include speed ratings on all tires, however, Technician B says that they are only included on high performance tires. Who is correct? When working on the brake system, you should Use only the latest approved machinery or procedure Power for tools used in the automotive shop is provided by ____. compressed air or electricity Tire information is molded into The sidewall Technician A says when using a floorjack, the handle should be kept in the upright position. Technician B says when using a floorjack, the handle should be kept in the lowered position When a tire is marked as ‘Temporary Use Only’, this means It is only suitable to use as a spare tire to move the vehicle to a safe place while the original tire is repaired When rising a car with a floor jack, never go under the car without jackstands Technician A says that radial tires grip the road better because they have higher rolling resistance. Technician B says that radial tires are better because they run hotter than cross-ply tires. Who is correct? Technician A says some electric fans will run when the engine is off and the key is removed from the ignition. Technician B says the only way an electric fan can run is when the engine is running. Who is correct? All Matters are made up of… Atoms When an atom has an equal number of protons and electrons, it is said to Have no overall charge An excess of electrons will give the atom a Negative charge A material with more free electrons is commonly referred to as A conductor ‘EMF’ stands for ‘Electro Motive Force’. In circuit calculations the ‘E’ is used instead of ‘EMF’.