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entire section of air line if any are found.
2.
Make certain that the air cylinder has been installed
directly in line with the brake pedal. If it is mounted at
an angle to the brake pedal (to one side or the other),
the air cylinder may jam in the extended position.
3.
Dirt or debris can enter the air lines if the weather
covers are not used over the quick couplers. It may
accumulate at the quick exhaust valve (see page two)
on the air cylinder, preventing the valve from venting air
out of the air cylinder. Disassemble the quick exhaust
valve and make certain it is not jammed.
Symptom
The towed vehicle brakes abruptly the first time
BrakeMaster is activated, ‘flat-spotting’ the tires. Also,
after towing, there may be excessive brake dust on the
wheels of the towed vehicle, and/or an unusual odor
near the towed vehicle’s brakes.
Solution
1.
The stored vacuum in the towed vehicle’s power
brake system
must
be depleted before towing — pump
the brake pedal several times. Depending on the make
and model of the towed vehicle, it may be necessary
to pump the brake pedal repeatedly.
Deplete the vacuum in the power brakes every time
the towed vehicle’s engine has been started — typically,
when the vehicle is connected for towing.
The engines in some vehicles, such as the Saturn
Vue, must be started periodically during towing. If the
towed vehicle’s engine must be started periodically,
always deplete the vacuum in the vehicle’s power brake
system
before
you resume towing.
Refer to the caution statement on page 14.
2.
If the towed vehicle has an ‘active’ (or, ‘continuous
power assist’) braking system, order the optional Brake
Pressure Reducer (part number 900002) to adapt the
vehicle to the BrakeMaster system.
Vehicles with ‘active’ brake systems include several
hybrid vehicles, such as some models of the Ford Escape
hybrid and the Mercury Mariner hybrid, as well as the H3
Hummer. These vehicles, and others with ‘active’ braking
systems, are designed so that even when the ignition is
turned to the ‘tow’ position, the braking system is still
active.
If the Brake Pressure Reducer is not installed,
BrakeMaster will apply excessive force to the towed
vehicle’s brake pedal.
3.
If the towed vehicle does not have power brakes,
order the optional Brake Pressure Reducer (part num-
ber 900002) to adapt the vehicle to the BrakeMaster
system.
BrakeMaster is designed to work with vehicles that
have a power brake system (even though the power
brakes are not activated while towing).
If the reducer is not installed, BrakeMaster will apply
excessive force to the towed vehicle’s brake pedal.
tRoUbleShootinG
Symptom
The motorhome monitor LED does not illuminate,
even though the brakes in the towed vehicle are being
applied.
Solution
1.
The monitor LED will not illuminate during very light
braking.
2.
Make certain that the monitor patch cord is securely
connected between the two vehicles.
3.
The towed vehicle-to-motorhome electrical cord
must also be connected — the monitor system uses it
for the ground wire.
4.
The monitor LED is connected to the towed vehicle’s
brake light circuit. If the fuse in the circuit is blown,
the LED will not illuminate. Check the towed vehicle’s
brake lights — if they illuminate when the brake pedal
is depressed, the fuse is good.
5.
Did you install the optional Brake-Lite Relay? If so,
make certain that the monitor wire is connected to the
towed vehicle’s brake light wire
after
the brake light
switch, but
before
the Brake-Lite Relay — connecting
the wire anywhere else will prevent the monitor LED
from functioning.
Symptom
Nothing happens after proper installation.
Solution
1.
The motorhome engine must be running, and the
parking brake must be released. If the engine is off,
there may be insufficient air pressure to activate Brake-
Master. If the parking brake is on, pressurized air is
prevented from entering the BrakeMaster air lines.
2.
Check the air line connections. Remove the weather
covers from the quick couplers at both vehicles, and
gently tug on the air line to verify that the quick couplers
are connected.
Check to make certain that the air cylinder quick
coupler is connected to the air line in the passenger
compartment.
3.
Follow the air lines from the motorhome back to the
air cylinder in the towed vehicle. Inspect the entire line
for deformities caused by excessive heat, and/or kinks
in the line, which would restrict the air flow — replace
the entire section of air line if any are found.
Disconnect the quick couplers to confirm that they
are allowing air to flow through them.
Symptom
The BrakeMaster air cylinder will extend and depress
the towed vehicle’s brake pedal. However, it will not
retract when the motorhome brake pedal is released.
Solution
1.
One of the air lines may be damaged or kinked.
Follow the air lines from the motorhome back to the air
cylinder in the towed vehicle. Inspect the entire line for
deformities caused by excessive heat, and/or kinks in
the line, which would restrict the air flow — replace the
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