Brinelling (Definition). - Correct Answer One or more indentations on bearing races usually caused by high static loads or application of force during
... [Show More] installation or removal.
Brinelling - Correct Answer on a bearing that has been shocked loaded, the race(cup) of the bearing can be dented. what is this type of bearing failure called?
the front brake rotors and pads are being replaced on a vehicle equipped with a tcs and esc. Technician A says the yaw rate and deceleration sensor should be recalibrated. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. who is right? - Correct Answer B only
The ABS (antilock brake system) amber light does not go off after the engine is started. Technician A says a parking brake not fully released could be the cause. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Who is right? - Correct Answer B only
If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber.
A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. Who is right? - Correct Answer Both A and B
The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Who is right? - Correct Answer Both A and B
The front wheel bearings are being adjusted. Technician A says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician B says backing off the castle nut will cause the bearing to overheat. Who is right? - Correct Answer A only
Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Who is right? - Correct Answer Both
The component in the Figure is involved what procedure? - Correct Answer Replacing sealed wheel bearing
When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. - Correct Answer with the engine off
Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Who is right? - Correct Answer Both
With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Technician A says the cause could be a leaking power brake booster diaphragm. Technician B says the cause could be a stuck closed residual check valve in the hose from the intake manifold to the power brake booster. Who is right? - Correct Answer Neither A nor B
Both technicians are wrong because this is how power brakes are supposed to operate.
A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. Technician A says the master cylinder pushrod adjustment is incorrect. Technician B says the cause is a faulty residual pressure check valve admitting air. Who is right? - Correct Answer Tech A only
Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air.
On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other brake pad is slightly worn. Technician A says excessive rotor run out could be the cause. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Who is right? - Correct Answer Tech B only
Insufficient clearance between the pads and caliper slider causes the slider not to move and only applies one brake pad causing only that pad to wear. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. [Show Less]