Chapter 98 Brake Hydraulic Systems

Two technicians are discussing master cylinders. Technician A says that it is normal to see fluid movement in the reservoir when the brake pedal is depressed. Technician B says a defective master cylinder can cause the brake pedal to slowly sink to the floor when depressed. Which technician is correct?

What law of hydraulics does the brake system use?

The primary brake circuit fails due to a leak in the lines, leaving the secondary section of a front/rear split master cylinder. Technician A says that the driver will notice a lower than normal brake pedal and some reduced braking power. Technician B says that the brake pedal will "grab" higher than normal. Which technician is correct?

Two technicians are discussing a problem where the brake pedal travels too far before the vehicle starts to slow. Technician A says that the brakes may be out of adjustment. Technician B says that one circuit from the master cylinder may be leaking or defective. Which technician is correct?

Air in the lines causes what type of problem?

The master cylinder is able to move about how much brake fluid during each brake application?

Brake fluid pressure is measured in what unit?

How much brake fluid is in a typical master cylinder reservoir?

What part in the master cylinder helps keep air from contacting the brake fluid yet allows the fluid level to drop as the disc brakes wear?

Technician A says that the brake fluid level should not be filled higher that the "MAX" level line to allow room for expansion when the brake fluid gets hot. Technician B says that the brake system should be checked for leaks or worn disc brake pads if the brake fluid is low. Which technician is correct?

If the brake pedal linkage is not adjusted correctly, brake fluid may not be able to expand back into the reservoir through the________ of the master cylinder when the brakes get hot.

The brakes on a vehicle work OK for a while, then the vehicle slows because the brakes self-applied. Technician A says that an overfilled master cylinder could be the cause. Technician B says that a blocked vent port (compensating port) could be the cause. Which technician is correct?

The rubber used in most brake systemcomponents will swell if exposed to ________.

Technician A says that the brake fluid reservoir should be filled to the top of the reservoir to be assured of proper brake pressure when the brakes are applied. Technician B says that the brake fluid level should be filled only to the maximum level line to allow for expansion when the brake fluid gets hot during normal operation. Which technician is correct?

Two technicians are discussing the operation of a master cylinder. Technician A says that the push rod is connected to the primary piston. Technician B says that the secondary piston is pushed forward by the fluid trapped ahead of the primary piston. Which technician is correct?