Technician A says a proportioning valve reduces the rate of pressure rise to the rear brakes above a split point. Technician B says a proportioning valve that fails open can allow early rear wheel lockup. Who is right?
Q 02Data-Driven
Front brake measurements are shown. The technician should:
Measurement
Specification
Left front
Right front
Inner pad thickness
3.0 mm minimum
2.5 mm
6.8 mm
Outer pad thickness
3.0 mm minimum
7.0 mm
6.9 mm
Rotor thickness
22.0 mm discard
24.1 mm
24.0 mm
Lateral runout
0.05 mm maximum
0.02 mm
0.02 mm
Q 03Most Likely
A vehicle has a low fluid level and the brake pedal is slightly low. Fluid is found on the front of the power booster shell. What is the MOST likely cause?
Q 04Scenario-Based
New rear shoes were installed and the pedal is low. Repeated reverse stops do not improve it. The cause is:
Q 05Least Likely / EXCEPT
Which of these is the LEAST likely to remove air from a brake hydraulic system?
Q 06Component Function
On a front-disc, rear-drum vehicle, the metering valve:
Q 07Procedure/Tool
After a rotor is machined on a lathe, the technician should:
Q 08Tech A/B
Technician A says hub flange runout can be corrected by machining the rotor off the vehicle. Technician B says indexing the rotor to a different hub position can reduce assembled runout. Who is right?
Q 09Data-Driven
A vacuum booster supply hose is tested at idle with a gauge. The gauge reads 8 in. Hg; specification is 15 to 20 in. Hg. The technician should next check:
Q 10Scenario-Based
An ABS code was repaired and cleared. The lamp stays off during a road test but the code returns after a cold start. What should be done next?
Q 11Least Likely / EXCEPT
Which of these is the LEAST likely cause of a rear drum brake that drags after the pedal is released?
Q 12Component Function
An active wheel speed sensor differs from a passive sensor because it:
Q 13Procedure/Tool
A replacement steel brake line must be routed and secured. The technician should:
Q 14Tech A/B
Technician A says a floating caliper's slide pins should be lubricated with wheel bearing grease. Technician B says outer pad wear greater than inner wear points to a seized caliper piston. Who is right?
Q 15Most Likely
A vehicle sets an intermittent left rear wheel speed sensor code after a rear axle seal replacement. Sensor resistance is in specification. What is the MOST likely cause?
Q 16Least Likely / EXCEPT
Any of these could cause a brake pedal that is hard to depress EXCEPT:
Q 17Component Function
The purpose of the check valve in a vacuum booster hose is to:
Q 18Scenario-Based
A growl from the right front increases with vehicle speed and changes when the vehicle is steered left. Brake components measure within specification. The cause is:
Q 19Tech A/B
Technician A says the ABS lamp lighting briefly at start-up is part of the module's self-test. Technician B says an illuminated ABS lamp disables the base hydraulic brakes. Who is right?
Q 20Data-Driven
A brake drum measures 10.024 in. at one point and 10.031 in. 90 degrees away. Maximum out-of-round is 0.006 in. The technician should:
Q 21Scenario-Based
A hydro-boost equipped truck has a hard pedal and heavy steering effort. Power steering fluid level is correct. The cause is:
Q 22Least Likely / EXCEPT
Which of these is the LEAST likely to cause an ESC system to intervene on a dry, straight road?
Q 23Most Likely
A vehicle vibrates at highway speed whether or not the brakes are applied, and the vibration does not change during braking. What is the MOST likely cause?
Q 24Tech A/B
Technician A says the red brake warning lamp can be lit by the parking brake switch. Technician B says the same red lamp lights when a wheel speed sensor code sets. Who is right?
Q 25Procedure/Tool
When flushing a hydraulic system contaminated with petroleum-based fluid, the technician should:
Answers and explanations are revealed after you submit the full test.
0%
0 / 25 CORRECT
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Reading Your Results: A5 Brakes, Test 2
This test comes at the same content areas from the hydraulic circuit and the
bench rather than the pedal. There are more questions about what a specific valve does, more
about line and hose service, and more that turn on separating a brake fault from something that
only looks like one.
If you missed the hydraulic valve questions
A front-disc, rear-drum system carries several valves that each solve one problem, and this
test expects you to keep them apart. A metering valve delays front disc application slightly so
the rear drums, which have to overcome return springs first, begin working at the same moment.
A proportioning valve limits how much pressure reaches the rear brakes above a designed split
point, so the lightly loaded rear axle does not lock before the front. A pressure differential
switch senses an imbalance between the two circuits and lights the red warning lamp. Each one
produces a different complaint when it fails, and knowing which valve owns which symptom is
worth several points on the real exam.
If you missed the questions built on a measurement
Three questions here hand you a reading against a limit, and each is asking whether you know
what that number controls.
Drum out-of-round. Out-of-round is a difference, not a reading. It is the
drum measured at one point compared against a measurement ninety degrees away, so it takes
two readings and a subtraction. That difference is what makes the pedal pulse, because the
shoes are pushed in and out once per revolution.
Booster vacuum supply. A vacuum booster needs a specified minimum at idle to
provide full assist, so a supply reading well below specification explains a hard pedal
without anything being wrong inside the booster itself. That is why the supply is measured
before the booster is condemned.
Rotor and hub runout. Runout is measured with a dial indicator, and where the
indicator sits determines what you have measured. Hub flange runout and rotor runout are two
separate readings, and a rotor cannot be machined true to a hub that is not running true,
which is why the hub is checked first.
If you missed the questions about what is actually a brake problem
Several questions on this test describe a symptom that has nothing to do with the brake
system, and that is deliberate, because it is the trap that costs technicians the most time. A
growl that increases with vehicle speed and changes when the vehicle is steered is a wheel
bearing being loaded and unloaded by weight transfer, not a brake. A vibration at highway speed
that does not change when the brakes are applied is a tire and wheel problem, since a rotor
fault only produces vibration when the pads are clamping it. An intermittent wheel speed sensor
code right after an axle seal replacement is a sensor or tone ring that was disturbed during
the job. Before diagnosing a brake, confirm the symptom actually appears when the brakes are
being used.
If you missed the EXCEPT and LEAST likely questions
Four appear on this test, and the method is the same one that works on the real exam.
Identify what the three real causes share before hunting for the odd one out. On the
hard-pedal question, three answers all remove or reduce power assist, and one is a condition
that makes the pedal travel further rather than harder. On the drum-drag question, three
answers all hold the shoes against the drum after release, and one affects how the brake
applies rather than how it releases. Naming the shared trait first is faster and far more
reliable than working through four options one at a time.
If both free tests are landing comfortably above 70 percent, the premium A5 tests move into
harder diagnostic scenarios on a 30-minute clock. They also score you by ASE content area and
by question type, and give you the official ASE task number for every question you miss, so
you can take those numbers straight to the study guide instead of rereading a chapter.
The ones you missed are open. Click any other question to see the answer and explanation.
Disclaimer: Study ASE for Free is an independent educational resource and is not affiliated with, endorsed by, sponsored by, or otherwise connected to the National Institute for Automotive Service Excellence (ASE), Prometric, or any official ASE testing center. All practice tests and materials provided on this site are created solely for educational and practice purposes only.
