Advertisement
5-1 2
BRAKES-SERVICE
NK105
Fig. 13-Wheel
Stud Nut Tightening Sequence
BRAKE HOSE AND TUBING
Inspection
The flexible hydraulic brake hose should always be
installed in the vehicle by first tightening the female
end of the hose in the wheel cylinder or rear axle
housing tee. The hose is then clipped to the hose
bracket in a manner to give minimum twist. Excessive
twist can result in hose interference problems with
possible hydraulic system failure.
Inspection of brake hose and tubing should be in-
cluded in all brake service operations. The hoses
should be inspected for:
(1) Correct length, severe surface cracking, pulling,
scuffing or worn spots. (Should the cotton fabric cas-
ing of the hose be exposed to weather by cracks or
abrasions in the rubber hose cover, eventual deteriora-
tion of the hose can take place with possible failure.)
(2)
Faulty installation will cause twisting, wheel,
tire or chassis interference.
Always use factory recommended hose to insure
quality, correct length and superior fatigue life. Care
should be taken to make sure that the tube and hose
mating surfaces are clean and free from nicks and
burrs. New copper seal washers should be used
and the tube nuts and connections are properly made
and tightened.
(3) Double wall steel tubing should always be used.
Care should be taken when replacing brake tubing,
to
use
the proper bending and flaring tools and to
avoid routing the tubes against sharp edges, mov-
ing components or in hot areas. All tubes should be
properly attached with recommended retaining clips.
Steel tubing is used to conduct hydraulic pressure
to the front and rear brakes. Flexible rubber hose is
used at both front brakes and at a rear axle junction
block. Steel tubing is used from the junction block to
both rear wheel cylinders. All fittings, tubing and
hoses should be inspected for rusted, damaged or de-
fective flaring seats. The steel tubing is equipped with
a
double flare or inverted seat
to
insure more positive
seating in the fitting.
Replacement or Repair
damaged tubing (Fig.
14).
(1) Using Tool C-3478, cut
off the damaged seat
or
NY
1371A
Fig.
1
L C u t t i n g and Flaring Steel Tubing
(2)
Ream out any burred or rough edges showing
on inside edges of tubing. This will make the ends
of the tubing square and insure better seating
of
the
flared end of the tubing.
Place compression nut on t u b
ing prior to flaring tubing.
(3) To flare tubing open handles of flaring Tool
(2-3838 and rotate jaws of tool until the mating jaws
of tubing size are centered in the area between verti-
cal posts.
(4)
Slowly close handles with tubing inserted
in
jaws but do not apply heavy pressure to handle as this
will lock tubing in place.
( 5 )
Place gauge "Form A" on edge over end of tub-
ing and push tubing through jaws until end of tubing
contacts the recessed notch of gauge matching the
size of tubing.
(6) Squeeze handles
of flaring tool and lock tubing
in place.
(7) Place proper size plug of gauge "A" down
in
end of tubing. Swing compression disc over gauge and
center tapered flaring screw in recess of disc.
(8)
Lubricate taper of flaring screw and screw in
until plug gauge has seated on jaws of flaring tool.
This action has started to invert the extended end
of the tubing.
(9) Remove gauge and apply lubricant to tapered
Hide quick links:
Advertisement
