Blue Ox BX88161 - Manual (Page 5)

Blue Ox Division, Automatic Equipment Mfg. Co. • One Mill Road, Industrial Park
Pender, Nebraska 68047 • Phone 402-385-3051 • Fax 402-385-3360 • www.blueox.us
TM
292-5972 8/06 4 of 11
Testing Brake System
Connect the towed vehicle to the coach with towing system. Connect the self-coiling air line
to the coach and towed vehicle. Make sure the sleeve clicks forward on the QD coupler, this
will ensure the plug and coupler are locked. With the towed engine off, pump the brake pedal
several times to deplete vacuum or power boost in the towed vehicle’s power brakes. THIS IS
VERY IMPORTANT, AS OVER BRAKING WILL OCCUR IF NOT COMPLETELY DE-
PLETED!! Start the coach engine and bring the air pressure up to pressure switch setting. Ap-
ply the coach brakes several times and witness the brake pedal movement in the towed vehicle.
Check that there are no leaks and that the cylinder in towed vehicle operates and releases
properly. Test drive the coach with towed vehicle attached on a hardtop road. Try the brakes
at several speeds above 50 MPH. You will notice the coach is stopping as if the towed isn’t
attached.
Figure 1
TESTING
The electrical installation can be
tested to see if it is installed correct-
ly. When applying the brakes with
the key in the off and the accessory
position, the rear brake lights should
not come on, but when applying the
brakes with the key in the on posi-
tion, the brake lights should come
on.