Chapter 5 Flashcards
Explain why 100% copper line should never be used as brake lines.
copper lines cant hold the pressure required
Describe an ISO flare.
an iso flare is a fitting with a flare on the end but not folded back onto its self
Why are brake hoses marked with raised ribs or colored stripes?
They are marked with strips to prevent twisting during assembly
Describe how an internal brake hose problem can cause brake pull and/or brake drag.
when the inside of the hose wears and it creates a flap
Describe how a leak-free fitting is achieved with SAE flare fittings.
The 3-degree mismatch provides a leak free connection
Describe why a double flare is a better choice than a single flare.
its much stronger than a single flare, seal is formed with tubing flare/ seat. not with threads
Explain how the ABS system has taken the place of many of the hydraulic control valves.
The ABS system its more precise than the hydraulic control valves
Describe the electronic brake pad wear indicator system used on some vehicles
when the brake pads get worn down a light on the dash will indicate that they need to be replaced
Explain the operation of the BPP sensor.
The BPP tells the computers how far/fast the brakes have been applied
Describe an ISO fitting.
An ISO fitting provides a good seal within the system
Brake lines or tubing consist of _______tubes or pipes and flexible ________connected with fittings.
steel, hoses
There are two common types of flares formed on the end of brake tubing, the _________ flare and the ________ flare.
ISO, Double
SAE Standard J1047 requires that an 18-inch length of tubing must withstand an internal pressure of ________ psi.
8000
An ISO flare is not ________ on itself as is a double flare.
folded back
_______ fittings have become popular with both domestic and foreign vehicle manufacturers.
ISO
Straight ________ fittings are usually found on the ends of brake hoses that attach to calipers or wheel cylinders.
compression washer
A ________ is used to attach a hose or tube to a port on a cylinder or caliper at a close right angle
Banjo Fitting
Late-model vehicles use a _______ position sensor in place of brake lamp switches.
brake pedal
The brake lamps, turn signals, and hazard flashers on many late-model vehicles are operated by a ________ connected to the computer network.
lighting module
The ________ switch has replaced the pressure differential valve warning switch on most vehicles.
failure warning lamp
Technician A says that a 100 percent copper tube is often used as a brake line material.
Technician B says there is a copper-nickel alloy brake tubing that meets SAE Standard J1047 and ISO 4038. Who is correct?
B
The flare on the end of a brake line has a bubble, or ball, shape.
Technician A says that this is a bubble flare.
Technician B says that this is an ISO fitting. Who is correct?
C
Technician A says fittings with an external taper is simply called a standard flare.
Technician B says a fitting with an internal taper is called an inverted or LAP flare. Who is correct?
Technician A says that a metering valve delays the application of the rear drum brakes.
Technician B says that the metering valve is only needed on four-wheel disc brake vehicles. Who is correct?
d
Technician A says on many vehicles the lighting module controls the brake lamps and turn signals.
Technician B says that these vehicles use the turn signal switch as an input to the lighting module. Who is correct?
C
Technician A says that a proportioning valve provides greater pressure to the rear drum brakes during normal vehicle load.
Technician B says that a proportioning valve provides lower pressure to the front disc brakes during initial brake application. Who is correct?
d
While discussing electrically actuated parking brakes,
Technician A says these systems operate via electric actuators located on the rear brake calipers, or by electric cable actuators.
Technician B says these actuators are controlled by their own control module. Who is correct?
Technician A says some vehicles use tubing sized in metric diameters.
Technician B says some common metric diameters are 4.75 mm, 6 mm, 8 mm, and 10 mm. Who is correct?
C
While discussing mechanical brake lamp switches,
Technician A says the stop-lamp switch is a normally open momentary contact switch.
Technician B says the same circuit is used to alert the ABS to monitor wheel speed sensors during braking. Who is correct?
c
While discussing brake pad wear indicators,
Technician A says that many brake pads utilize a simple scraper built into the brake pad itself that touches the rotor when the pads wear down.
Technician B says the scraping sound goes away when the brakes are released. Who is correct?
