1. Fill the master cylinder reservoirs with
brake fluid and keep at least one-half full of fluid during the bleeding operation.
2. If the master cylinder is known or
suspected to have air in the bore, then it must be bled before any wheel cylinder or
caliper in the following manner;
a. Disconnect the forward (blind end) brake
pipe connection at the master cylinder.
b. Allow brake fluid to fill the master
cylinder bore until it begins to flow from the forward pipe connector port.
c. Connect the forward brake pipe to the
master cylinder and tighten.
d. Depress the brake pedal slowly one time
and hold. Loosen the forward brake pipe connection at the master cylinder to purge
air from the bore. Tighten the connection and then release the brake pedal
slowly. Wait 15 seconds. Repeat the sequence, including the 15 second wait,
until all air is removed from the bore. Care must be taken to prevent brake fluid
from contacting any painted surface.
e. After all air has been removed at the
forward connection, bleed the master cylinder at the rear (cowl) connection in the same
manner as the front in Step "d" above.
f. If it is known that the calipers and
wheel cylinders do not contain any air, then it will not be necessary to bleed them.
3. Individual wheel cylinder or calipers
are bled only after all air is removed from the master cylinder.
a. Place a proper size box end wrench over
the bleeder valve. Attach transparent tube over valve and allow tube to be hand
submerged in brake fluid in a transparent container. Depress the brake pedal slowly
one time and hold. Loosen the bleeder valve to purge the air from the
cylinder. Tighten bleeder screw and slowly release pedal. Wait 15
seconds. Repeat the sequence, including the 15 second wait until all air is
removed. It may be necessary to repeat the sequence 10 or more times to remove all
the air. JB1 thru JB6 gas engine vehicle- Rapid pumping of the brake pedal pushes
the master cylinder secondary piston down the bore in a manner that makes it difficult to
bleed the rear side of the system.
4. It is necessary to bleed all of the
wheel cylinders and calipers, the following sequence should be followed:
1) Right rear wheel cylinder; 2) Left rear
wheel cylinder; 3) Right front caliper; 4) Left front caliper.
5. Check the brake pedal for
"sponginess" and the brake warning light for indication of unbalanced
pressure. Repeat entire bleeding procedure to correct either of these two