4-208. BRAKE SYSTEM SERVICE. (Continued)
(16) Tighten the bleeder screw and slowly
release the pedal.
(17) Wait 15 seconds, then repeat this
sequence (including the 15 second wait)
until all the air is purged from the wheel
cylinder/caliper and brake fluid begins to
(18) Continue steps 13 through 17 at each
wheel until the entire brake system has
(19) Check the brake pedal for sponginess and
the brake warning lamp for an indication
of an unbalanced pressure. Repeat the
entire bleeding procedure to correct either
of these two conditions.
c. Pressure Bleeding.
The pressure bleeding equipment
must be of the diaphragm type. It
must have a rubber diaphragm
between the air supply and the
brake fluid to prevent air, moisture,
oil and other contaminants from
entering the hydraulic system.
Also, it is very important that the
correct master cylinder bleeder
adapter be used to avoid possible
damage to the master cylinder
(1) Fill the pressure tank at least 1/3 full of
brake fluid (Appendix D, Item 4). The
(3) Use the combination valve depressor to
bleeder must be re-bled each time fluid is
depress and hold the valve stem on the
combination valve during the bleeding
(2) Charge the bleeder to 20 25 psi (140 170