brake tubing with the same coating should be
used as a service replacement. Care should be
taken when replacing brake tubing, to be sure the
proper bending and flaring tools and procedures are
used, to avoid kinking. Do not route the tubes
against sharp edges, moving components or into hot
areas. All tubes should be properly attached with rec-
ommended retaining clips and fasteners.
Care must be taken when servicing components to
avoid damage to the flexible stainless steel hoses
between the master cylinder and junction block or
antilock hydraulic control unit.
ISO STYLE TUBE FLARING PROCEDURE
CAUTION: ALWAYS USE THE PROPER TYPE OF
ISO FLARING TOOL AND REQUIRED PROCEDURE,
WHEN TUBE FLARING IS REQUIRED WHEN SER-
VICING THE VEHICLES HYDRAULIC BRAKE SYS-
TEM. THIS IS REQUIRED TO ENSURE THE
INTEGRITY OF THE VEHICLE’S HYDRAULIC BRAK-
ING SYSTEM.
Using Tubing Cutter, Special Tool C-3478-A or
equivalent, cut off damaged seat on tubing (Fig. 32).
Ream out any burrs or rough edges showing on
inside of tubing. This will make the ends of tubing
square (Fig. 33) and ensure better seating of flared
end tubing. Be sure to put the tube nut on tub-
ing before the tubing is flared.
CAUTION: All ISO style tubing flares are of metric
dimensions. When performing any service proce-
dures on a vehicle using ISO style tubing flares,
metric size tubing of 4.75 mm MUST be used with
metric ISO tube flaring equipment.
To create a (metric) ISO style tubing flare, use
Snap-On Flaring Tool TFM-428, (Fig. 32) or the
equivalent. See (Fig. 34) and proceed with the steps
Fig. 31 I. S. O. Style Tubing Flare And Fitting
Connection
1 – ISO STYLE TUBING FLARE
2 – ISO FLARE TUBE NUT
3 – SEAT
4 – TUBE
5 – ISO-FLARE (METRIC)
Fig. 32 Cutting and Flaring of Brake Line Tubing
1 – SPECIAL TOOL TFM428
2 – SPECIAL TOOL C3478A
Fig. 33 Tube End Properly Prepared For Flaring
1 – BE SURE ALL BURRS ARE REMOVED FROM INSIDE OF
TUBING
2 – BE SURE END OF TUBING IS SQUARE BEFORE FLARING
TUBE
3 – HYDRAULIC BRAKE LINE TUBING
5 - 22 BRAKES LH
SERVICE PROCEDURES (Continued)
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