ASE A5 Brakes Study Guide (Hydraulic Systems
Diagnostics and Repair Section) A+ Study Blueprint:
Key Concepts & Practice Questions!!
Pascals Law correct answers 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 correct answers The single circuit brake system
that operated the brakes in all four wheels with a single piston master cylinder (pg11)
Dual Brake System correct answers 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 correct answers 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) correct answers allow brake fluid to pass back and
forth from the revivor to each piston chamber (pg12)
Residual pressure check valve correct answers 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 correct answers 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) correct answers 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 correct answers Maintains an air tight seal on the master cylinder while
simultaneously allowing the reservoir to breath (pg14)
Pedal height correct answers The distance between the pedal and the floor when the brake are
not applied (pg14)
What may be the cause of incorrect pedal height? correct answers An Improperly adjusted
master cylinder pushrod (pg15)
What may be the cause of lower than specified pedal height? correct answers A bent or
misaligned pedal, worn pedal bushings, weak pedal return springs (pg14)
Other things that may affect pedal height correct answers The stoplight or cruise control
switch adjustments.
May also cause brake drag. (pg14)
Pedal reserve correct answers The max specified travel the pedal has before touching the
floor. (pg14)
Diagnostics and Repair Section) A+ Study Blueprint:
Key Concepts & Practice Questions!!
Pascals Law correct answers 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 correct answers The single circuit brake system
that operated the brakes in all four wheels with a single piston master cylinder (pg11)
Dual Brake System correct answers 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 correct answers 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) correct answers allow brake fluid to pass back and
forth from the revivor to each piston chamber (pg12)
Residual pressure check valve correct answers 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 correct answers 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) correct answers 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 correct answers Maintains an air tight seal on the master cylinder while
simultaneously allowing the reservoir to breath (pg14)
Pedal height correct answers The distance between the pedal and the floor when the brake are
not applied (pg14)
What may be the cause of incorrect pedal height? correct answers An Improperly adjusted
master cylinder pushrod (pg15)
What may be the cause of lower than specified pedal height? correct answers A bent or
misaligned pedal, worn pedal bushings, weak pedal return springs (pg14)
Other things that may affect pedal height correct answers The stoplight or cruise control
switch adjustments.
May also cause brake drag. (pg14)
Pedal reserve correct answers The max specified travel the pedal has before touching the
floor. (pg14)
