Haulotte Group 3522A, Operator'S Maintenance Manual

Page: 117 / 142

HAULOTTE GROUP 9 AXLE AND RELATED COMPONENTS
117
HOW TO USE YOUR ELECTRIC BRAKES PROPERLY
Your trailer brakes are designed to work in synchronization with your tow vehicle brakes. Never use
your tow vehicle or trailer brakes alone to stop the combined load.
Your brake controller must be set up according to the manufacturer’s recommendations to ensure
proper synchronization between the tow vehicle and the trailer. Additionally, you may have to make
small adjustments occasionally to accommodate changing loads and driving conditions.
Proper synchronization of tow vehicle to trailer braking can only be accomplished by road testing.
Brake lockup, “grabbiness”, or harshness is quite often due to the lack of synchronization between
the tow vehicle and toe trailer being towed, too high of a threshold voltage (over 2 volts), or under
adjusted brakes.
Before any synchronization adjustments are made, your trailer brakes should be burnished-in by
applying the brakes 20-30 times with approximately a 20 mph (32 Km/h) decrease in speed, e.g. 40
mph (64Km/h) to 20 mph (32Km/h). Allow ample time for brakes to cool between applications. This
allows the brake shoes and magnets to slightly “wear-in” to the drum surfaces.
TABLE 9-2. TRAILER WIRE SIZE CHART
Number of Brakes Hitch-to-Axle Recommended Minimum Hook-up
Wire size (copper)
2 12 AWG
4 Under 30 ft (9.0 m) 12 AWG
4 30 ft - 50 ft (9.0 - 15m) 10 AWG
6 Under 30 ft (9.0 m) 10 AWG
6 30 ft - 50 ft (9.0 - 15m) 8 AWG