Troubleshooting — BrakeMaster 9100 and 9160
Symptom
The motorhome monitor LED does not illuminate, even
though the brakes in the towed vehicle are being ap-
plied.
Solution
1.
The 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 de-
pressed, 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 park-
ing brake must be released. If the engine is off, there
may be insufficient air pressure to activate BrakeMaster.
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 cou-
pler is connected to the air line in the passenger compart-
ment.
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 entire section 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 placed over the quick couplers. It may
accumulate at the quick exhaust valve 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 Brake-
Master is activated, ‘flat-spotting’ the tires. Also, after tow-
ing, 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 de-
plete the vacuum in the vehicle’s power brake system
before
you resume towing.
2.
If the towed vehicle has a full-time (‘active’) power
braking system, install the optional Brake Pressure Re-
ducer (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, Brake-
Master will apply excessive force to the towed vehicle’s
brake pedal.
3.
If the towed vehicle does not have power brakes, in-
stall the optional Brake Pressure Reducer (part number
900002) to adapt the vehicle to the BrakeMaster sys-
tem.
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.
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Содержание BrakeMaster 9060
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