W350 1 Ton Pickup 4WD V8-360 5.9L VIN U 4-bbl (1982)
4. Continue this bleeding with:
a. The left rear wheel.
b. Next, bleed the right front.
c. Finish with the left front wheel.
5. Repeat this bleeding procedure if there is any indication of air remaining in the hydraulic system:
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Spongy brake pedal
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Warning light ON
Gravity Bleed: Remove master cylinder reservoir cover and gasket, then fill reservoirs with approved brake fluid. Open disc brake bleeder screws, and
allow fluid and air to drain until stream of fluid is free of air.
Pedal Bleed: Follow normal procedure of pumping pedal and opening bleeder screws. Do not pump master cylinder dry!
NOTE: If diagnosis determines that master cylinder alone is cause of trouble, it can be replaced without bleeding the hydraulic system provided the
replacement cylinder is completely bled before installation. After brake tubes are connected have helper apply force to pedal while both tube nuts are
cracked to release any air and then retightened.
NOTE: All vehicles are equipped with a pressure hold-off valve. The valve is located (in the combination valve) on the left frame rail. The hold off
valve balances front and rear braking force to improve braking and steering control on icy surfaces. The valve shuts off the flow of brake fluid between 3
and 135 PSI. Because the valve shuts off flow in this pressure range the valve must be held open manually -- using tool C-4121 or equivalent -- when
pressure bleeding the system. Gravity and pedal bleeding DO NOT require holding this valve open.
