Sohail busal power steering gear hydro-boost power steering pump return

7/21/20, 4:15 PM - Sohail Busal: AURTTB001 Inspect and service braking systems
7/21/20, 4:15 PM - Sohail Busal: 1. Identify five (5) important items of personal safety when inspecting and servicing braking systems?

1 Hearing protection
2 Skin protection
3 Clothing
4 Footwear
5 Safety glasses and shields.

3. Why should safety stands be placed under a raised vehicle?

Basic safety states that you must use safety stands as jacks are not fail proof.

4 Lower radio aerial.

5 Close all vehicle doors.

Safety Data Sheet (SDS)
7. How should waste hydraulic fluid be stored and disposed?

Hydraulic fluid should be correctly stored, labelled and removed by a licensed contractor.

7/21/20, 4:15 PM - Sohail Busal: 1 Pads
2 Caliper body
3 Rotor
4 Piston Seal
5 Hollow piston
6 Pad spring
7 Brake line connection
8 Bleeder screw
7/21/20, 4:15 PM - Sohail Busal: 12. A typical fixed caliper housing is designed with one caliper piston.

True or False: False
13. A typical floating caliper housing is designed with one caliper piston. True or False: True 14. Complete the following statement about disc brake caliper function using the following words.

A. The front brakes of small, compact vehicles
B. The rear brakes of vehicles with rear disc brakes
C. The front brakes of large pickup trucks and SUVs
D. Both “the front brakes of small, compact vehicles” and “the rear brakes of vehicles with rear disc brakes”
7/21/20, 4:15 PM - Sohail Busal: Q17 IS D
7/21/20, 4:15 PM - Sohail Busal: 18. Caliper housings are made up from?

A. Aluminium
B. Cast iron
C. Both “Aluminium” and “Cast iron”
7/21/20, 4:15 PM - Sohail Busal: Q18 IS C
7/21/20, 4:15 PM - Sohail Busal: 19. Linings are __________ to disc brake pads?

Words: Action, Applied, Brake, Direction, Drum, Effectiveness, Force, Important, Multiplies, Pin, Pressing, Rotating, Shoe, Stop, Vehicle
Drum brake operation is fairly simple. The most important feature contributing to the effectiveness of the braking force supplied by the drum brake is the brake shoe pressure or force directed against the drum. With the vehicle moving in either the forward or reverse direction with the brakes on, the applied force of the brake shoe pressing against the brake drum increasingly multiplies itself (called self-energizing) because the brake’s anchor pin acts as a brake shoe stop and prohibits the brake shoe from its tendency to follow the movement of the rotating drum. The result is a wedging action between the brake shoe and brake drum. The wedging action combined with the applied brake force creates a self-multiplied brake force.

26. All master cylinders are made of cast iron? True or False: True
7/21/20, 4:15 PM - Sohail Busal: 27. The purpose of the master cylinder is to ______.

A tandem master cylinder is essentially two master cylinders formed by installing two separate pistons and fluid reservoirs into one cylinder bore. Each piston applies hydraulic pressure to two wheels.

7/21/20, 4:15 PM - Sohail Busal: 31. Name the components of a master cylinder assembly below.

Vacuum-operated units and hydraulic pump operated units

34. Power assisted brakes are designed with vacuum-assisted units that use engine vacuum? True or False: True

B. Provide reserve power assist pressure if the engine stalls

7/21/20, 4:15 PM - Sohail Busal: ANSWER IS B

7/21/20, 4:15 PM - Sohail Busal: 1 Vacuum check valve

2 Front housing

41. A rear disc/drum parking brake uses the inside of each rear wheel hub and rotor assembly as a parking brake drum?

True or False: True
42. Rear disc parking brake have a mechanism that forces the pads against to rotor hydraulically.

45. Electric park brakes, are fitted with a motor solenoid, so there is no need for parking brake cables and

linkages.

The force can be increased at the output (i.e., at the wheel) by increasing the size of the piston, though piston travel decreases. The force at the output can be decreased by decreasing the size of the piston, but the piston travel increases.

47. Explain the operation of the mechanical braking system?

Compressed air from the compressor is stored in a wet tank in a semi-dried condition. It then flows to the multi-circuit protection valve, which divides the feed to serve the two service reservoirs.

Simultaneously, pressurised air from the reservoirs combines through internal passages in the multi-circuit protection valve to operate the remote spring brake actuator through the hand control valve. Two service lines are connected to a tandem power cylinder controlled by a dual foot valve. This arrangement maintains air supply to the other circuit in case of a fault develops in one service line. The power piston push rod pushes the tandem master cylinder hydraulic piston forward so that the air pressure is converted to hydraulic pressure. The hydraulic fluid supply is divided into two circuits to serve the front and rear brake expander cylinders. A hydraulic load sensing valve is installed in the output circuit of rear axle of the tandem master cylinder. This valve appropriately proportions the braking effort provided by the rear axle based on the load carried. This is achieved by modifying the fluid pressure reaching the rear brake cylinders.

51. DOT 3 brake fluid has a higher boiling point than DOT 4 fluid. True or False: False

7/21/20, 4:15 PM - Sohail Busal: 52. From the image below, explain what the technician is checking for?

A. Thickness

B. Parallelism

7/21/20, 4:15 PM - Sohail Busal: The technician is measuring rotor thickness. Place a brake disc micrometer about 1 inch (25mm) in from the outer edge of the rotor and measure the thickness. Compare the measurement to specifications. Repeat the measurement at about eight points equidistant (45 degrees) around the surface of the rotor and compare each measurement to specifications. 7/21/20, 4:15 PM - Sohail Busal: 58. Drum brake linings should be replaced when linings are?

A. Worn to within 1/32 inch (.8mm) of the rivet head
B. Contaminated with oil or grease
C. Contaminated with brake fluid
D. All answers are correct
7/21/20, 4:15 PM - Sohail Busal: Q58 ANSWER IS D
7/21/20, 4:15 PM - Sohail Busal: 59. List five (5) types of wear to look for when inspecting brake drums?

Air is compressible and must be removed from the brake system to produce proper hydraulic pressures.

65. Complete the following statement about drum brake adjustment using the following words.

Pump the brake pedal several times until the pedal is hard. This moves the pads back into light contact with the rotors and prevents accidents when the vehicle is first driven.

68. Consider the various checks that you would make after servicing brakes?

The Job Card becomes a legal document. Service records are kept by the workshop to maintain the vehicle’s service history and for legal purposes.