||On Disc front,
Drum rear combinations with a single master
cylinder, be sure to remove the residual check
valve, or purchase a master cylinder without a check
valve. You must then install an in-line residual
check valve in the line to the rear drum brakes. The
valve should be installed on the brake side of the
proportioning valve as shown in the diagram.
||When using a
dual master cylinder with Disc front, Drum rear
combinations you won't need to remove the residual
check valve as it only applies pressure to the rear
brake line. On dual master cylinders, the large
reservoir side is for the disc brakes, and the small
reservoir side is for the drum brakes.
||Do not use a
residual pressure valve with 4 wheel Disc brake
systems. The residual pressure will cause the
calipers to drag.
Proportioning valve allows you to balance the
pressure between the front and rear brakes for
smooth safe stops. This is a must for disc/drum
combinations, as disc brakes require considerably
more pressure to operate than drum brakes. Without a
properly adjusted proportioning valve, the drum
brakes will lock up before the discs do which can
result in handling problems. Proportioning valves
are also useful on 4-wheel disc or 4-wheel drum
brake systems, giving you the ability to compensate
for tire size differences, weight distribution, etc.
||Make sure that
the bleeder valves on the calipers and the power
booster point up when installed. Air cannot be fully
bled from the system unless the valves are installed
in the up position.
||If you do not
intend to use a power booster, we recommend that you
use a dual master cylinder.