13
On the Road
BRAKING SYSTEM
The electric brakes on your RV are similar to the drum brakes on many cars and trucks. The basic
difference between them is that your RV brakes are operated by 12-volt DC power from the tow vehicle
rather than by hydraulic action. The brakes have been factory calibrated for smooth, positive response.
During break-in they may squeak. This is normal and should cease after a few miles of wear. The brake
system on your RV consists of several major components all of which must function properly for safe
braking.
Brake System Components
Tow Vehicle Battery -
The tow vehicle battery is the primary power source for the RV braking
system.
RV Battery -
The RV battery provides power to activate the brakes in the event that the RV
unintentionally becomes disconnected from the tow vehicle while traveling. This is
accomplished via the breakaway switch.
RV Brakes -
Your RV brakes are actuated by 12-volt power from the tow vehicle brake
controller. The greater the braking effort from the brake controller, the greater the breaking force
applied to the RV brakes. The RV brakes are also actuated by the breakaway switch in case the
tow vehicle and trailer become uncoupled. To ensure brakes are in good working order, brake
shoes, and drums should be checked for wear annually. The RV brakes are self-adjusting,
eliminating the need to adjust as a maintenance item.
Breakaway Switch -
The breakaway switch is located on the RV tongue or pin-box. This
important safety item is required in most states. It has a steel cable (lanyard) which will reach to
the frame of the tow vehicle. This device is one of the most vital components on your RVs
braking system. It automatically applies the RV brakes if the tow vehicle and RV become
uncoupled while in motion. The breakaway switch operates when a pull pin linked by the cable
to the tow vehicle is separated from the switch. When the switch closes, power for brake
application is transferred from the onboard RV battery. The steel lanyard must be anchored to the
tow vehicle when the RV is hitched up. Secure this cable loop to the permanent frame of the tow
vehicle or a part of the hitch that is not removable. Do not fasten the breakaway switch lanyard
to the hitch ball, hitch pin, or any other removable part of the hitch.
Test the breakaway switch operation before each trip as follows:
1.
Hitch the RV to the tow vehicle.
2.
Pull out the breakaway switch actuating pin.
3.
Test brakes by ensuring that they prevent the hitched RV and tow vehicle from rolling when the
tow vehicle is placed in 'Drive'. The breakaway switch is functioning properly if the RV brakes
are activated.
Do not connect the breakaway switch lanyard to the king pin, pin
box, or to any removable part of the hitch. Remember that the
breakaway switches emergency braking feature requires a fully
charged battery on the RV.