ASE A5 Brakes Study Guide (Hydraulic Systems Diagn
ASE A5 Brakes Study Guide (Hydraulic Systems Diagn
ASE A5 Brakes Study Guide (Hydraulic Systems Diagn
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ASE A5 Brakes Study Guide (Hydraulic
Systems Diagnostics And Repair Section)
– Questions and Answers
Pascals Law - -1. Liquids cannot be compressed
2. When Pressure is applied to a liquid within a closed space, pressure is
applied to a liquid within a closed space, pressure is exerted in all directions
(pg10)
-The brake system used on cars up to 1966 - -The single circuit brake
system that operated the brakes in all four wheels with a single piston
master cylinder (pg11)
-Dual Brake System - -Divided the brake system in to two parts using two
pistons in the master cylinder for each circuit (Front to Back, or Diagonally)
(pg11-12)
-Diagonally Split System - -Provides braking power to one front wheel and
to the opposing rear wheel in the case of brake failure in a single circuit
(pg11-12)
-Compensating port (replenishing port) - -allow brake fluid to pass back and
forth from the revivor to each piston chamber (pg12)
-Residual pressure check valve - -Used to maintain slight pressure in the
brake lines and also used keep wheel cylinders pistons tight against their
bores to prevent air entry into the system (pg13)
-Low-drag caliper - -Designed to improve fuel efficiency by providing extra
clearance between the brake pad and the rotor (pg13-14)
-step-bore (quick take-up master cylinder) - -Utilizes a larger rear cylinder
bore and quick take up valve in order to provide a large volume of fluid at
low pressures (light pedal application) during the initial part of the pedal
stroke (pg14)
-Reservoir gasket - -Maintains an air tight seal on the master cylinder while
simultaneously allowing the reservoir to breath (pg14)
-Pedal height - -The distance between the pedal and the floor when the
brake are not applied (pg14)
-What may be the cause of incorrect pedal height? - -An Improperly
adjusted master cylinder pushrod (pg15)
, -What may be the cause of lower than specified pedal height? - -A bent or
misaligned pedal, worn pedal bushings, weak pedal return springs (pg14)
-Other things that may affect pedal height - -The stoplight or cruise control
switch adjustments.
May also cause brake drag. (pg14)
-Pedal reserve - -The max specified travel the pedal has before touching the
floor. (pg14)
-What may be the cause of a hard pedal on a vehicle equipped with a step-
bore? - -A restricted center orifice in the quick take-up valve (pg15)
-What may be the cause of a low pedal on a vehicle equipped with a step-
bore? - -A broken or weak check ball spring on quick take up valve. (pg15)
-Symptoms of a plugged quick take up valve - -The front right brake pads
experience premature wear on a front wheel drive car (pg15)
-Another possible cause for a low or spongy pedal - -Air trapped in the
hydraulic system (pg15)
-What must be adjusted after a power booster or pushrod is replaced - -The
pushrod (pg15)
-The possible cause of no brake pedal free-play or dragging brakes - -A
closed compensating port in the master cylinder (pg15)
-What can be the possible result of an over extended pushrod - -brake drag
(pg15-16)
-What can be the possible result of an under adjusted pushrod - -excessive
brake pedal travel (pg15-16)
-The two methods used to confirm the correct adjustment for proper
pushrod length and installation - -The gauge method and the air method
(pg16)
-What must be done to a master cylinder before installation - -It must be
bench bled in order to bleed out any air in the system. (pg16)
-What may be symptom of a bulging hose - -a spongy brake pedal (pg17)
-Why shouldn't brake hoses be clamped on modern vehicles - -Increases the
chances of damaging hose lining material (pg17)
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