Roadmaster 98300 Installation Instructions Manual - page 7
5
Install the proportioning valve
Figure 13
Figure 11
Figure 12
If the motorhome is raised at any time during
the installation, it must be on a hoist or safely and
securely supported and blocked.
If the motorhome is equipped with an air suspen-
sion system and a line to the air suspension system
is inadvertently opened, or if the motorhome’s air
suspension system is turned off, the motorhome
will lower to the ground.
The motorhome may unexpectedly roll forward
or backward, especially if it is on an incline, if it
is not blocked.
1. The proportioning valve (Figure 13) will be installed
on the frame of the motorhome chassis, and attached
to the brake line.
First, choose a location for the proportioning valve
— find the steel brake line that is routed along the
frame. If the motorhome is a Class A, there may be a
brake union (Figure 11) every ten to 15 feet, where two
sections of brake line are connected. The proportioning
valve must be installed near one of these brake unions.
However, some Class A motorhomes, and most
Class C motorhomes, have a one-piece brake line,
from the front to the rear. There are no brake unions
on these motorhomes.
If there are no brake unions, or the brake unions are
difficult to access, there are two installation options:
• Follow the steel brake line forward, until it joins with
another fitting. This is the point where you can tee into
the brake line, as described later.
• Follow the steel brake line back, until it joins a rub-
ber brake hose (Figure 12). This junction is the second
possible location to tee into the brake line.
Since the brake tee will not thread onto the rub-
ber brake hose, it will be necessary to attach a short
section of steel brake line and install the brake tee as
shown in Figure 13. This section of steel brake line is
not supplied; contact an auto parts store.
continued on next page