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BRAKE SYSTEM PIPES AND HOSES REPLACEMENT.
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TM-5-4210-224-14-P 250 6PM Mini-Pumper Firefighting Truck Model No.:CM-KFT-3 Manual
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BRAKE SYSTEM COMBINATION VALVE REPLACEMENT.
TM5-4210-224-14&P
4-209. BRAKE SYSTEM PIPES AND HOSES REPLACEMENT. (Continued)
CAUTION
Never  use  copper  tubing  for
hydraulic  brake  lines  because
copper  is  subject  to  fatigue,
cracking and corrosion which result
in brake failure.
NOTE
When replacing a steel brake pipe,
always use steel piping which is
designed
to
withstand
high
pressure and resist corrosion. The
same size pipe must be used as
the one removed.  The outside
diameter of the pipe is used to
specify the size.
Brake pipes that run parallel to each
other must maintain a 1/4 inch (6
mm) clearance.
c. After flaring, blow out the brake pipe with
compressed air before installing on the vehicle.
When installing pipe, a special
d. Bend the pipe to match the configuration of the
double-lap  flaring  tool  must  be
old pipe by using a pipe bender.
used, as single flaring tools cannot
produce a flare strong enough to
e. Attach the pipe to the rear brake drum hose.
hold the necessary pressure. When
using the tool, be sure to follow the
NOTE
instructions furnished by the tool
The hose must not be twisted
manufacturer.  Be sure to inspect
newly formed flares for cracks or
malformations which might cause
f. Using new copper washers (3), install the pipe
leaks.
and hose (2) with new washers (3) to the drum.
a. Cut the pipe with the tube cutter to length. Add
g. Install the other end of the hose (2) to the frame
1/8 inch (3mm) to the length for each flare.
with the nut or clip (1).
b. Flare the pipe ends by following the instructions
h. Install the front brake hose (2) to the caliper with
provided  by  the  double  lap  flaring  tool
the bolt (4) and new copper washers (3).
manufacturer.
i. Install the other end to the frame with nut or clip
(1).
WARNING
Compressed air used for cleaning
j. Bleed the brakes (paragraph 4-208).
or  drying  can  create  airborne
k. Install wheel assembly (paragraph 4-203).
particles that may enter the eyes.
Pressure shall not exceed 30 psi
(206 kPa). Wearing of goggles is
required  to  avoid  injury  to
personnel.
4-289

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