Hydraulic Brake System

Air in the lines will cause what kind of problem?

• Hard Pedal

• Brake Noise

• Vibration in the brake pedal during stops.

• Low spongy brake pedal.

Answer explanation

Air in the brake lines leads to a low spongy brake pedal, as it compresses under pressure, reducing the effectiveness of braking. This results in a less responsive brake feel, making it harder to stop the vehicle.

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

• 50ml

• One teaspoon

• One cubic inch

• One Tablespoon

Answer explanation

The master cylinder typically moves about one teaspoon of brake fluid during each brake application. This small volume is sufficient to engage the braking system effectively.

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 is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Answer explanation

Technician A is correct because fluid movement in the reservoir is normal when the brake pedal is pressed. Technician B is also correct as a defective master cylinder can cause the brake pedal to sink slowly, indicating a problem.

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

• Technician A

• Technician B

• Both Technician A and B

• Neither Technician A nor B

Answer explanation

Technician A is correct. A failure in the master cylinder leads to a lower brake pedal and reduced braking power, as the system cannot build adequate pressure. Technician B's claim about the pedal 'grabbing' higher is incorrect.

The rubber diaphragm used in most brake system components mounted to the master cylinder cover will swell if exposed to:

• DOT 5 brake fluid

• Water

• Moisture in the air

• Engine oil or Automatic Transmission Fluid

Answer explanation

The rubber diaphragm will swell when exposed to engine oil or automatic transmission fluid, as these substances can degrade rubber materials, unlike DOT 5 brake fluid, water, or moisture which do not cause swelling.

Technician A says that the brake pedal height should be checked as part of a thorough visual inspection of the brake system Technician B says that the pedal free play and pedal reserve should be checked. Which Technician is correct?

• Technician A

• Technician B

• Both Technician A and B

• Neither Technician A nor B

Answer explanation

Both technicians are correct. Technician A highlights the importance of checking brake pedal height during a visual inspection, while Technician B emphasizes the need to check pedal free play and reserve, which are also crucial for brake function.

The brakes can self apply if this occurs:

• The vent port in the master cylinder is clogged or covered.

• The master cylinder is overfilled.

• The replenishing port is clogged or covered

• None of the above

Answer explanation

The brakes can self-apply if the vent port in the master cylinder is clogged or covered, as this prevents pressure release, causing the brakes to engage unintentionally.

"When force is applied to a liquid confined in a container or an enclosure, the pressure is transmitted equal and undiminished in every direction." This is known as:

• Bernoulli's Principle

• Pascal's Law

• Ohm's Law

• Newton's Law

Answer explanation

Pascal's Law states that when force is applied to a confined liquid, the pressure is transmitted equally in all directions. This principle is fundamental in hydraulics and distinguishes it from Bernoulli's Principle, Ohm's Law, and Newton's Law.

The heart of the brake system is the:

• Brake pads

• The Caliper

• The Combination Valve

• The Master Cylinder

Answer explanation

The Master Cylinder is the heart of the brake system as it generates hydraulic pressure to activate the brakes. It plays a crucial role in controlling the braking force, making it essential for the system's operation.

A master cylinder design that operates by pushing fluid to the front left caliper and the rear right wheel cylinder is called the _________________ design.

• Dual split

• Front-Rear

• Diagonal Split

• None of the Above

Answer explanation

The diagonal split design refers to a master cylinder configuration that sends fluid to opposite wheels, specifically the front left caliper and rear right wheel cylinder, enhancing braking balance and safety.