From time to time a test station will call us for advice on testing (from an equipment perspective that is) and we are always pleased to discuss such issues with them – as we say “Advice is free”.
Some of the strangest calls we get though are were we are told that the installed equipment has suddenly developed “a mind of it’s own”; and decides (if we take a motorcycle roller brake tester for example) that it will only test one of the wheels.
Of course this is impossible, the brake tester simply assesses an axle which is presented to the rollers and has no means of saying to itself “this is a rear wheel and I’m not going to test that”.
Of course in the office we can see immediately that there is something more to the problem than just an equipment related issue. Simply then it’s a question of running through the testing procedure in order to understand what has happened – it is highly unlikely (although not actually impossible) that a component failure occurred in the unit between the 2 wheels being presented and so further drilling down into the presented vehicle is required.
Normally, given the above set of circumstances, the motorcycle is a “trials” type bike with “off-road” tyres. Such tyres are not designed for normal road use and the blocks sit proud of the normal tyre face which causes jumping of the wheel in the roller set.
A modern roller brake tester is very sensitive and this jumping action is sufficient for the brake tester to sense that the middle roller has stopped turning which it identifies as a “lock-out”.
Therefore in order to test such bikes it is necessary to revert to a decelerometer test using your brake meter – those (few) stations that still operate without such a device can bring themselves in line with the regulation requirements by purchasing one and avoiding such problems as those described above.
For more information on our motorcycle brake tester click HERE
For more information on our hand held decelerometer click HERE