Another type of line is the armored line. Armored
lines are standard steel tubes around which steel wire is
coiled, Figure 9-21. The steel spring protects the line from
impact damage. Armored lines are usually used under the
vehicle.
Line Installation
Factory steel lines are pre-bent to the shape needed to
snugly fit the frame and other parts of the vehicle. The
bends are relatively gentle to reduce the possibility of
kinks. Figure 9-22 shows the routing of brake lines on a
Chapter 9 Hydraulic Valves, Switches, Lines, and Hoses 159
Figure 9-20. Typical steel brake line (tubing) construction. (Ford)
Corrosion resistant
plating
Double-lap
flare
Steel outer
layer
Steel inner
layer
Figure 9-21. Armored brake line is used in location where the
tubing could be subjected to flying debris and other minorr
abuse. These are connected to an anti-lock brake hydraulic
actuator.
Armored
brake line
Figure 9-22. The layout of brake lines and hoses as used on one particular vehicle. (Chevrolet)
Master
cylinder
Brake
line
Brake
line
Brake
line
Drumu
brake a
Parking
brake cable
Brake
line
Brake
line
Brake
hose
Brake
hose
Brak ke
caliper
Brake
caliper
Brake
hose
Proportioning
valve
typical vehicle. Aftermarket steel lines are available in pre-
cut lengths, but must be bent and flared to be installed on
the vehicle. These procedures are covered in Chapter 10.
Tubing Flares
To make a solid connection to the hydraulic units, the
ends of all steel lines have tubing flares. A tubing flare is an
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