Roadmaster 98300 Installation Instructions Manual - Wire The Air Compressor
Figure 1
2
1. Check online at the ROADMASTER web site —
www.roadmasterinc.com — for vehicle-specific informa-
tion. Select ‘Vehicle-Specific Info,’ then ‘Supplemental
Braking Systems.’ Enter the vehicle make, model and
year, then scroll down the page.
2. If the motorhome brake line has metric fittings it
will be necessary to use a metric-to-standard T-fitting
to attach the proportioning valve. This fitting is not
supplied in the kit.
Identify the size of the metric brake line before
the installation. If it is 10 or 12 millimeters, contact
ROADMASTER — T-fittings in both sizes are available.
The 10 millimeter T-fitting (part number 7923) fits
virtually all metric brake lines for this application; the
part number for the 12 millimeter fitting is 7921.
In the unlikely event that the brake line is not 10
or 12 millimeters, we recommend you contact a local
hose and fitting shop or other contractor and arrange to
have the brake line cut and flared so that the standard
brake line tees supplied in the kit can be installed.
3. If the motorhome has a one-piece brake line (i.e.,
there are no brake line unions), or if the brake line
Before you begin the installation…
Wire the air compressor
1. Before wiring the air compressor (Figure 1), first
choose a mounting location — the air compressor as-
sembly must be installed in a clean, dry area (ideally, a
storage compartment), within 20 feet of the motorhome
starting battery.
The compressor is attached with four screws — one
at each corner of the air compressor housing. The sur-
face and underlying material at these four points must
provide sufficient support to hold the compressor firmly
unions are difficult to access, a short length of steel
brake line will be necessary to connect the proportion-
ing valve. (See “Install the Proportioning Valve.”) This
section of steel brake line is not supplied; contact an
auto parts store.
These instructions pertain to the initial installa-
tion of the second motorhome kit only. Installation
instructions for the complete BrakeMaster system
(including instructions for all components in the
towed vehicle) are contained in the original instal-
lation instructions.
Operating instructions for the BrakeMaster sys-
tem are contained in the owner’s manual.
For the most recent versions of the instructions
and manual, visit www.roadmasterinc.com.
Read the appropriate instructions before install-
ing or operating the BrakeMaster system. Failure to
understand how to install or operate BrakeMaster
could result in property damage, personal injury or
even death.
in place.
The compressor may be mounted horizontally or
vertically; however, it must be mounted so that the
drain valve (Figure 1) is pointing down. Condensation
in the air tank must be drained periodically, through this
valve. A short length of rubber hose is included for this
purpose — the hose can be attached to the valve and
routed to the exterior of the motorhome. If possible,
continued on next page