BASE BRAKE BLEEDING
NOTE: To bleed this vehicles antilock brakes
hydraulic system, see the antilock brake system
service procedures in this group of the service
manual. It describes in detail the required proce-
dure which needs to be followed when bleeding the
antilock brake system.
CAUTION: Before removing the master cylinder
cover, wipe it clean to prevent dirt and other foreign
matter from dropping into the master cylinder.
PRESSURE BLEEDING
CAUTION: Use bleeder tank Special Tool C-3496-B
or equivalent, with Adapter, Special Tool 8224 (Fig.
27), to pressurize the brake hydraulic system for
bleeding.
Follow pressure bleeder manufacturer’s instruc-
tions, for use of pressure bleeding equipment.
When bleeding the brake system. Some air may be
trapped in the brake lines or valves far upstream. As
much as ten feet from the bleeder screw (Fig. 28).
Therefore, it is essential to have a fast flow of a large
volume of brake fluid when bleeding the brakes. This
will ensure all the air is bled from the brakes
hydraulic system.
(1) Remove rubber dust caps from all 4 bleeder
screws.
(2) Attach a clear hose to the bleeder screw at one
wheel and feed the hose into a clear jar containing
fresh brake fluid (Fig. 29).
CAUTION: Just cracking the bleeder screw often
restricts fluid flow, and a slow weak fluid discharge
will NOT get all the air out.
(3) Open bleeder screw (Fig. 29) on caliper assem-
bly or wheel cylinder, at least one full turn or more
to obtain an adequate flow of brake fluid.
(4) After 4 to 8 ounces of brake fluid has been bled
through an individual wheel’s brake hydraulic sys-
tem. And an air-free flow (no bubbles) is maintained
in the clear plastic hose and jar, this will indicate a
good bleed of this individual hydraulic circuit.
(5) Repeat the procedure at all the other remain-
ing bleeder screws. Then check the pedal for travel.
If pedal travel is excessive or has not been improved.
Enough fluid has not passed through the system to
Fig. 27 Pressure Bleeding Adapter Mounted On
Fluid Reservoir
1 – SPECIAL TOOL 8224
2 – MASTER CYLINDER FLUID RESERVOIR
Fig. 28 Trapped Air in Brake Line
1 – TRAPPED AIR
Fig. 29 Proper Method for Purging Air From Brake
System
1 – CLEAR HOSE
2 – BRAKE CALIPER
3 – BLEEDER SCREW
4 – CLEAN BRAKE FLUID
5 - 20 BRAKES LH
SERVICE PROCEDURES (Continued)
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