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Brakes - GMC X-7425 1973 Maintenance Manual

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FRONT FRAME EXTENSION REMOVAL
The front frame extension should only be re-
placed if absolutely necessary due to the complexity
and amount of labor involved .
NOTE:
To drain, disconnect, or remove certain
components it may be necessary to refer to addi-
tional sections in this maintenance manual (such
as, draining gas tanks; Refer to Section 8 "Fuel
Tank and Exhaust" .
Drain
1 . Drain power steering fluid .
2. Drain brake fluid.
3. Release freon from A/C system .
4. Drain gas tanks.
5. Drain engine cooling system .
Disconnect
1 . Fuel Filler hose at front elbow .
2. Hose from tube going to charcoal canister .
3 . If two canister are used, disconnect hoses from
the one mounted on the stepriser.
4. Rear brake line from combination valve .
5 . Heater hoses and pre-heater at engine .
6. Vacuum lines at cruise control.
7. Power brake vacuum line.
8 . Hose to thermasan switch .
9. Speedometer cable at cruise control (at trans-
mission without cruise control) .
10 . Accelerator cable at carburetor .
11 . Transmission shift cable at transmission .
12 . Oil filler tube at front end.
13 . Vacuum line at vacuum tank mounted on the
side of the heater.
14 . Brake lines at master cylinder.
15 . Hydraulic lines to windshield wiper motor.
16 . Air lines.
Remove
2. Remove mufflers and Y-pipe.
8. Remove front body mount bolts.
9. Remove frame section bolts.
11 . Front wheels .
12 . Front fender wells .
13 . Grille .
15 . Radiator.
FRONT FRAME EXTENSION
INSTALLATION
FRAME
2- 3
1 . Remove Engine, Transmission, and Final
Drive Assembly .
3 . Remove torsion bars and rear torsion bar sup-
port .
4. Take steering gear off of frame and remove
front bumper assembly .
5 . Remove batteries and battery box with air
tank.
6. Remove parking brake cable from front frame
section.
7. Remove thermasan hose from unit on exhaust
pipe (if used).
10. Air conditioning compressor and hoses (cap
all A/C hoses).
14 . Lower fiberglass section below grille .
16 . After the bolts holding the front frame exten-
sion are removed it will be possible to pull it forward
and down clearing the body . A high capacity floor
jack should be used to move the front frame exten-
sion forward and down .
Installation of the front frame extension is ac-
complished by reversing the removal procedures .
REAR FRAME EXTENSION REMOVAL
1 . Remove rear bumper by removing both

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