Blue Ox BX88143 User 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 •
TM
292-5640 4/06 4 of 12
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 DEPLETED!! Start the coach engine
and bring the air pressure up to pressure switch setting. Apply 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.