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WorksheetsBrake Diagnosis (Hydraulic)
Total questions: 15
Worksheet time: 23mins
A vehicle has a hydroboost power brake system. Poor brake performane can be caused by:
A defective vacuum booster
Low Engine Vacuum
Low power steering fluid
A faulty brake light switch
Which of the following is the most likely cause of a hard brake pedal?
Low Brake Fluid
Low Manifold Vacuum
Worn Brake Pads
Excessive Rotor Runout
True or False? If a vehicle has a seized caliper it will pull to the side of the seized caliper (ex: Seized left caliper--the vehicle will pull left)
True
False
A customer complains about a brake pulsation after the front rotors are replaced. This is most likely caused by which of the following?
Low Brake Fluid
Low Engine Vacuum
Sticking Slide Pins
Rust between the hub and rotor
A customer complains of a spongy brake pedal. Which of the following is the most likely cause?
Torn Vacuum Booster Diaphragm
Sticking Parking Brake Cables
Air in the Hydraulic System
Incorrect Brake Pedal Freeplay
A customer states they are experiencing a problem when the vehicle is stopped. The brake pedal slowly sinks all the way to the floor. What is the most likely cause?
Air in the brake lines
A torn diaphragm in the brake booster
Failing master cylinder cup seals
Seized wheel cylinder
A vehicle with front disc, rear drum brakes is having a problem when braking. The front of the vehicle dips when braking (nose dives) What component is the most likely the cause?
Proportioning Valve
Metering Valve
Brake Booster
Parking Brake Cable
A technician is replacing a brake line which of the following is NOT correct?
Brake lines should be double walled steel
Compression fittings are an acceptable means of repair
Brake lines are flared using double flare or bubble flare methods
Brake line fitting are available in standard and metric thread pitches.
Combination Valves contain all of the following except:
Brake lamp switch
Brake differential switch
Proportioning valve
Metering valve
True or False. Over heated brake fluid can boil and vaporize which will leave vapor pockets in the hydraulic system. This can result in a spongy brake pedal.
True
False
A vehicle has low brake fluid. Tech A says to check the brake lining thickness. Tech B says to check for leaks. Who is correct?
Tech A
Tech B
Both Techs
Neither Tech
Vacuum boosters require______ to operate properly.
5-10 Hg
10-15 Hg
17-21 Hg
True or False. A wheel bearing with excessive play can cause a spongy brake pedal.
True
False
Brake hoses should be inspected for:
Cracks/splits
Chaffing
Bulging when the brake pedal is pumped up
All of the above
All the brakes on a vehicle are dragging. What is the most likely cause?
Incorrectly adjusted drum brakes
Low Brake fluid
A leaking vacuum line going to the vacuum booster
Incorrectly adjust brake pedal freeplay
