T4 ASE BRAKES (MEDIUM/HEAVY
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH CORRECT
SOLUTIONS
On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side of the
vehicle are almost completely worn while the right side is almost new. Technician A says that too much
rotor runout could be the cause. Technician B says that a binding caliper piston could be the cause. Who
is right? - ANSWER - Technician B only
A customer complains that their vehicle pulls to the right when the brakes are applied. Technician A says
a restricted brake line to the left caliper can cause this problem. Technician B says a malfunctioning
proportioning valve is probably the cause. Who is right? - ANSWER - Technician A only
With foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes moves
down slightly when the engine is started. Tech A says that this condition can be caused by a leaking
power brake booster diaphragm. Tech B says that the cause could be a faulty power brake booster check
valve. Who is right? - ANSWER - Neither A or B
Technician A says that the tool shown above is used to adjust the brake shoes. Technician B says that the
tool shown above is used to determine the inside diameter of the drum. Who is right? - ANSWER -
Technician A only
The hydraulic system on a vehicle with integral ABS is to be bled. Technician A says that the front brakes
can be bled in a conventional manner. Technician B says that both front and rear brakes can only be bled
using the pressure from a fully charged accumulator. Who is right? - ANSWER - Technician A only
Two technicians are discussing the duo-servo type drum brake design. Technician A says the brake lining
on the secondary shoe is usually longer and thicker than the brake lining on the primary shoe.
Technician B says the primary shoe is installed toward the rear of the vehicle. Who is right? - ANSWER -
Technician A only
, Technician A says that DOT 5 brake fluid has a lower boiling point than DOT 4. Technician B says that
DOT 4 brake fluid is silicone-based and should never be used in an ABS system. Who is right? - ANSWER -
Neither A or B
Technician A says that a caliper seal installed in the caliper bore is called a stroking seal. Technician B
says that when the brake pedal is released, the piston in the caliper moves back in its bore due to the
action of the piston seal. Who is right? - ANSWER - Technician B only
Technician A says that when rebuilding a caliper with a stroking seal, the condition of the caliper bore
surface is critical. Technician B says that when rebuilding a caliper with a fixed seal, the condition of the
piston surface is the most important consideration. Who is right? - ANSWER - Both A and B
Technician A says that when a rotor is machined, an equal amount of material must always be removed
from both sides. Technician B says that the minimum thickness dimension cast into the rotor is the
dimension that the rotor can be machined to. Who is right? - ANSWER - Neither A or B
Technician A says that DTCs can be accessed from any ABS system using flash diagnostics. Technician B
says that ABS system tests can be performed with a bi-directional scan tool. Who is right? - ANSWER -
Technician B only
A few minutes after the engine was turned off on a vehicle with vacuum power assist, the brake pedal is
applied and is hard to push. Technician A says that this is a normal condition. Technician B says that the
booster check valve is leaking. Who is right? - ANSWER - Technician B only
During a brake inspection, an area of the vacuum brake booster below the master cylinder is found to be
damp. Tech A says that this is a normal condition. Tech B says that any evidence of fluid indicates a leak
and the master cylinder must be replaced. Who is right? - ANSWER - Technician A only
Technician A says that tapered roller bearings can be adjusted using a torque wrench. Technician B says
that tapered roller bearings are adjusted using a dial indicator. Who is right? - ANSWER - Both A and B
Technician A says that, when testing a proportioning valve, the pressure at the outlet port to the rear
brakes should rise at a faster rate, once transition pressure is reached. Technician B says that vehicles
with diagonally-split hydraulic systems must have the proportioning valve tested twice. Who is right? -
ANSWER - Technician B only
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH CORRECT
SOLUTIONS
On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side of the
vehicle are almost completely worn while the right side is almost new. Technician A says that too much
rotor runout could be the cause. Technician B says that a binding caliper piston could be the cause. Who
is right? - ANSWER - Technician B only
A customer complains that their vehicle pulls to the right when the brakes are applied. Technician A says
a restricted brake line to the left caliper can cause this problem. Technician B says a malfunctioning
proportioning valve is probably the cause. Who is right? - ANSWER - Technician A only
With foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes moves
down slightly when the engine is started. Tech A says that this condition can be caused by a leaking
power brake booster diaphragm. Tech B says that the cause could be a faulty power brake booster check
valve. Who is right? - ANSWER - Neither A or B
Technician A says that the tool shown above is used to adjust the brake shoes. Technician B says that the
tool shown above is used to determine the inside diameter of the drum. Who is right? - ANSWER -
Technician A only
The hydraulic system on a vehicle with integral ABS is to be bled. Technician A says that the front brakes
can be bled in a conventional manner. Technician B says that both front and rear brakes can only be bled
using the pressure from a fully charged accumulator. Who is right? - ANSWER - Technician A only
Two technicians are discussing the duo-servo type drum brake design. Technician A says the brake lining
on the secondary shoe is usually longer and thicker than the brake lining on the primary shoe.
Technician B says the primary shoe is installed toward the rear of the vehicle. Who is right? - ANSWER -
Technician A only
, Technician A says that DOT 5 brake fluid has a lower boiling point than DOT 4. Technician B says that
DOT 4 brake fluid is silicone-based and should never be used in an ABS system. Who is right? - ANSWER -
Neither A or B
Technician A says that a caliper seal installed in the caliper bore is called a stroking seal. Technician B
says that when the brake pedal is released, the piston in the caliper moves back in its bore due to the
action of the piston seal. Who is right? - ANSWER - Technician B only
Technician A says that when rebuilding a caliper with a stroking seal, the condition of the caliper bore
surface is critical. Technician B says that when rebuilding a caliper with a fixed seal, the condition of the
piston surface is the most important consideration. Who is right? - ANSWER - Both A and B
Technician A says that when a rotor is machined, an equal amount of material must always be removed
from both sides. Technician B says that the minimum thickness dimension cast into the rotor is the
dimension that the rotor can be machined to. Who is right? - ANSWER - Neither A or B
Technician A says that DTCs can be accessed from any ABS system using flash diagnostics. Technician B
says that ABS system tests can be performed with a bi-directional scan tool. Who is right? - ANSWER -
Technician B only
A few minutes after the engine was turned off on a vehicle with vacuum power assist, the brake pedal is
applied and is hard to push. Technician A says that this is a normal condition. Technician B says that the
booster check valve is leaking. Who is right? - ANSWER - Technician B only
During a brake inspection, an area of the vacuum brake booster below the master cylinder is found to be
damp. Tech A says that this is a normal condition. Tech B says that any evidence of fluid indicates a leak
and the master cylinder must be replaced. Who is right? - ANSWER - Technician A only
Technician A says that tapered roller bearings can be adjusted using a torque wrench. Technician B says
that tapered roller bearings are adjusted using a dial indicator. Who is right? - ANSWER - Both A and B
Technician A says that, when testing a proportioning valve, the pressure at the outlet port to the rear
brakes should rise at a faster rate, once transition pressure is reached. Technician B says that vehicles
with diagonally-split hydraulic systems must have the proportioning valve tested twice. Who is right? -
ANSWER - Technician B only
