Roadmaster BrakeMaster 8310, BrakeMaster 8315 Installation Instructions Manual

1-800-669-9690

www.roadmasterinc.com

85-1840 -03 04- 09

Replacement Air Compressor

part numbers 8310 and 8315

Installation Instructions

ALL SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

ROADMASTER, Inc. 6110 NE 127th Ave. Vancouver, WA 98682 800-669-9690 Fax [phone] www.roadmasterinc.com

Before you begin the installation…

This kit will replace the air compressor in BrakeMaster
8000, 9000 and 9060 systems.

These instructions assume that you will install the
replacement compressor in the same location as the
original, and also that you have removed the original
compressor, and disconnected the wiring and air line,
from a previously-installed BrakeMaster.

For complete 9000-series installation and operating
instructions visit www.roadmasterinc.com; call 800-669­9690 for 8000-series installation and operating instructions.

Figure 1

These instructions pertain to the installation of the
replacement air compressor and associated compo­nents only. Instructions for the complete system are
available online, or by calling 800-669-9690.
Read all instructions before installing or operating
this product. Failure to understand how to install or
operate BrakeMaster could result in property dam­age, personal injury or even death.

Step One

Wire the air compressor

1. Position the air compressor so that the four pre-drilled
holes in the housing (one at each corner, Figure 1) are
aligned over the four screw holes used to attach the
original compressor.

Do not attach the air compressor now — in most cases,
it will be considerably easier to connect the wiring and
the air lines with the compressor loose.

2. At the air compressor, use one of the small ring ter­minals to attach the red wire to the terminal block screw
opposite the pre-attached red wire (Figure 2).

Next, use another small ring terminal to attach the
black wire to the terminal block screw opposite the pre­attached black wires (Figure 2).

Note: due to manufacturing variances, the preattached

red and black wires may be mounted to different terminal
block screws than those shown in Figure 2. If this is the

Figure 2

case, match color to color — red wire opposite red wire,
and black wire opposite black wires.

3. Next, use another small ring terminal to attach the

continued on next page

continued from preceding page

blue wire to the terminal block screw labeled “blue wire”
in Figure 2.

Note: due to manufacturing variances, the preattached
blue wire may be mounted to a different terminal block
screw than the one shown in Figure 2. If this is the case,
match color to color — blue wire opposite blue wire.

Step Two

Attach the air line and compressor

Before connecting the air line, make certain that it
is clean. If dirt or debris is not removed, air pressure
will carry it through the system, which may prevent
proper operation of the braking system or damage
system components.

1. Connect the air line to the “out” compression fitting
on the air compressor (Figure 1). Before doing so, make
certain that the brass insert (Figure 3) is still inside the
line, and that the ferrule (Figure 3) is positioned ¼" from
the end of the line.

Note: if the brass inserts are omitted, the fittings will

not be airtight.

Next, push the air line into the compression fitting, as
far as it can go. Then push the ferrule into the compres­sion fitting, and tighten the compression nut onto the
fitting.

Note: if the compression nut is overtightened, the fit-

ting will not be airtight. After completing the installation,
check the fittings for air leaks (Step Three, below).

2. With the air line attached, position the air compressor
over the four pilot holes, and use the provided screws to
secure the compressor in place.

2. Check to make certain that the handle on the air tank
drain valve (Figure 4) is closed.

Figure 3

Figure 4

Step Three

Check for proper function

1. Start the motorhome engine and allow the air com­pressor to run until it shuts off (about 45 seconds). Then,
hold the brake pedal down until the air compressor shuts
off again.

If the air compressor does not function as described
above, check the wiring. Make certain that all connections
have been made as described in Step One — “Wire the
air compressor.”

2. Check for leaks in the air line — first, cover the fittings
at the air compressor with a leak check solution.

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.

ROADMASTER, Inc. • 6110 NE 127th Ave. • Vancouver, WA 98682 • 800-669-9690 • Fax [phone] • roadmasterinc.com

The air system now contains pressurized air, which
may cause severe eye or ear injury if it is inadver­tently released. Wear appropriate eye and ear protec­tion before adjusting the air system fittings.

Tighten any fittings, if necessary, and repeat until all
connections are airtight.

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