Roadmaster 98300 Installation Instructions Manual - Install The Air Lines
not be airtight.
Now, push the air line into the compression fitting,
as far as it can go. Then push the ferrule into the com-
pression fitting, and tighten the compression nut onto
the fitting.
Note: if the compression nut is overtightened, the
fitting will not be airtight. After completing the instal-
lation, check all the fittings for air leaks — see “Final
connections and system test.”
Note: if the air line is connected to the “out” com-
pression fitting on the proportioning valve, no air can
pass through the valve, and the BrakeMaster system
will not function.
4. With the air lines attached, position the air compres-
sor over the four pilot holes you drilled earlier, and use
the provided screws to secure the compressor in place.
5. Next, route the remaining length of air line from
the “out” compression fitting on the proportioning valve
(Figure 9) to the female quick coupler you attached in
step 1 (above).
As described above, tape the ends of the air line
and avoid damaging the line as you route it.
Trim the air line to length and connect it to both
compression fittings. Use the same method described
in step 3 (above).
6. Check to make certain that the handle on the air
tank drain valve (Figure 15) is closed.
CAUTION
The handle on the air tank drain valve should
only be opened to drain the air tank. If the handle
is open during towing, the air compressor will run
constantly, which may damage the compressor.
Figure 15
1. Find a suitable location at the rear of the motorhome,
near the center, to attach the preassembled female
quick coupler (with an orange shield base — Figure 14).
Attach the bracket with two of the supplied ¼" nuts and
bolts, with the female quick coupler pointing away from
the motorhome.
Note: the weather covers will prevent dirt or debris
from entering the lines. Keep the fittings covered when
the braking system is not in use.
2. Route the provided length of air line from the “in”
compression fitting on the air compressor (Figure 1) to
the “in” compression fitting on the proportioning valve
(Figure 8).
Tape the ends of the air line and avoid moving parts,
sharp edges or “hot” components such as the engine
or the exhaust system. Do not kink the air line, or bend
it to the extent that it crimps or creases.
CAUTION
Do not position the air line closer than two feet
from any heat source. The heat will soften the plas-
tic, which will cause the air line to rupture.
If the air line is ruptured, the supplemental brak-
ing system will not function.
Do not kink the air line, or bend it to the extent
that it crimps or creases — air pressure will be sub-
stantially reduced, or blocked entirely, at the kink
in the line.
If the air pressure is reduced, the supplemental
braking system will not function, or may only func-
tion intermittently.
Where appropriate, use one or more of the included
wire ties to secure the air line in place.
3. Trim the air line to length and connect it to the “in”
compression fitting on the air compressor, and to the
“in” compression fitting on the proportioning valve — first,
if necessary, trim each end of the air line, to make a
smooth and straight cut. Then slide the compression
nut and the ferrule (Figure 14) over the air line. Position
the ferrule ¼" from the end of the air line. Next, slide
one of the brass inserts (Figure 14) into the end of the
line.
Note: if the brass inserts are omitted, the fittings will
Install the air lines
Figure 14
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