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Bleeding Hydraulic System
Only G. M. Hydraulic Brake Fluid Super No. 11 should be
used when bleeding brakes.
The hydraulic brake system must be bled whenever a pipe
line has been disconnected, when a leak has allowed air to
enter the system or at any time the system has been opened.
For satisfactory brake operation the system must be completely
free of all air.
Bleeding should be accomplished by one of two methods,
pressure or manual. Bleeding should be done on the longest
line first. On all except the Ph, 2 and 2% ton models, the
proper sequence is left rear, left front, right rear and right
front. On the 1%, 2 and 2% ton, the proper sequence is
Hydrovac slave cylinder, Hydrovac valve bleeder valve, left
rear wheel, right rear wheel, left front wheel and right front
wheel.
Pressure Bleeding (Except Ph, 2 and 2% Ton)
1. Clean all dirt from top of main cylinder and remove filler
plug.
2. Connect hose from bleeder tank to main cylinder filler
plug opening and open valves at both ends of hose.
NOTE: Make sure fluid in tank is up to petcock above outlet and
that tank is charged with 20 pounds air pressure.
3. Remove bleeder valve screw and screw bleeder hose into
bleeder valve, placing other end of hose in a container having
sufficient fluid to cover end of hose.
4. Open bleeder valve by turning
%
turn in a counterclock-
wise direction and watch flow of fluid at end of bleeder hose.
5. Close bleeder valve tightly as soon as bubbles stop and
fluid flows in a solid stream.
6. Remove
bl~~der
hose and install bleeder valve screw in
bleeder valve.
7. Repeat above operations at each wheel.
Pressure Bleeding (1%, 2 and 2% Ton)
1. Back off adjustment all the way on upper shoe on both
rear wheels.
2. Clean all dirt from top of main cylinder, remove filler
cap from main cylinder and fill the reservoir to the top of filler
plug opening.
3. Connect pressure bleeder to main cylinder and open
valve in the bleeder tank line .
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