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A roller brake tester is a well-known method to analyse
and judge the efficiency of the braking system of a vehicle. The brake forces induce reaction forces on the electric motor. An electric transducer with strain gauges measures these reaction forces. The roller diameter is sufficiently large to keep the tyre flexing to a minimum. The special coating of the rollers is very wear resistant and provides good friction values, both wet and dry. There is a third smaller roller on each side between the wheel supporting rollers has two functions: The first is to detect if a vehicle is present in the roller bed (a build in safety device to prevent the motor to start up without a vehicle in place). For safety purposes, the motors will also not start unless the left and right small rollers are not pushed down within one second of each other. The second function is to detect if tyre slippage on the rollers does not exceed the maximum value.
Our brake testers are equipped with a digital display containing a horizontal LED digital display (for presentation of brake forces left, right, imbalance and brake efficiency), seven lamps, a computerised processing system, three manual start/stop buttons and an emergency stop button.
Seven lamps
During the test, the computer measures the brake force values. The system will calculate the imbalance between left brake forces and right brake forces of an axle, as well as the brake efficiency of the service brake and the parking brake (vehicle weight input required). An optional printer can be connected to generate a full test report. Usually these units are operated through the infra-red remote control, however it can also be operated manually if the remote is lost or damaged. |
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Brake testers consists of a mechanical floor unit, roller cover plates, a
digital display and an infra-red remote control transmitter and receiver.
The mechanical unit contains two electrical motors, two independent sets of
three measuring rollers, two brake force transducers and additional safety
sensors.
