Requirements for Authorisation D Issue Date March 2019 79 in which the alignment was last checked. 5. Brake Testing. Brake testing equipment will be considered suitable if the following are provided 5.1 A calibrated decelerometer on DVSA’s latest List of Acceptable Equipment 5.2 A calibrated roller brake tester on DVSA’s latest List of Acceptable Equipment. 5.3 A roller brake tester (RBT) must be installed so that a) it is centrally located in an unobstructed, substantially level area, at least m long and m wide b) m standing area to the rear of the RBT may extend outside a building provided the ground is substantially level is constructed of acceptable material and the roller brake tester bed plate is installed not less than 1.5 m from an entrance or exit c) vehicles are substantially level while being tested (a gradient of not more than 5%) d) the console is positioned so that it can easily be read by the tester performing the test on the vehicle e) an intercom system allowing the tester to communicate with the assistant when any axle is positioned in the brake rollers f) any part of the roller brake tester is at least mm from an inspection pit, lift platform or lift recess (except cross pit rollers) g) when a cross-pit RBT is installed there must bean isolator that prevents operation of the RBT when a person is in the pit. It must be positioned soother equipment will not interfere with brake testing h) there must be four chocks available for use in the roller brake test area i) the RBT maybe installed outside the building. The rollers should have a canopy to protect them from the rain and the console should be mounted in a suitable position protected from the weather and excessive exhaust fumes. The brake tester should be situated adjacent to the test bay with a viewing facility. 5.4 roller brake tester user/operator instructions are available. 5.5 suitable data on ABS warning systems is available. 5.6 a means of determining brake efficiency and imbalance from the roller brake tester readings is available. 5.7 suitable arrangements are made for re-calibration of the decelerometer, and the roller brake tester.