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MOT brake test Useless DVSA software not fit for purpose.

The DVSA have recently updated their MOT computer software ready for the roll out of the new procedures in May. I had the job of presenting a vehicle 1st used before 1 January 1968 yesterday. As many will know such vehicles only require to meet a service brake efficiency of 45% of the gross weight. Yesterday's vehicle achieved 48%. The DVSA test standard in another section of the software program clearly states 45% pre 1968. When it came to entering the actual figures the software insisted on issuing a fail. The software recognised the date of 1st use as a date in 1966 but absolutely refused to recognise its own requirements. In the end there was no alternative within a reasonable amount of time but to do the brake test again until the readings totalled 51%

The best bit was that the DVSA software invites to tester to submit feedback about the new procedures... they got some.

If presenting a bus then I strongly advise that a recent weighbridge certificate for the unladen vehicle is available since the recorded weights form the RBT machine cannot be relied upon even though they are supposed to be within a 2% tolerance.

Re: MOT brake test Useless DVSA software not fit for purpose.

I've had similar experiences with the software at my 18 week RBTs done at a local coach firm and at the ATF I use for class VI MOTs. This is before the recent changes. Axle weights usually wrong and pass values set at 50% despite entering yes to the question "Was the vehicle first registered before 1968". Last year this resulted in my first MOT fail, spoiling a 100% record and resulting in an expensive retest. I've also had fails for ovality, with a pass when repeated five minutes later with no adjustments. I'm glad you gave some feedback. I just had to grin and bear it, taking the attitude that it word be unhelpful to argue with the DVSA examiner or complain afterwards.

My bus number (if any): RMs 238, 471 and 2213, GS17

Re: MOT brake test Useless DVSA software not fit for purpose.

Chris,

I would suggest you to write to the DVSA register your complaint, mention that you are not the only one to suffer from their ineptitude and demand that they adjust your OCRS score to reflect the true position. Hopefully you still have the RBT print out to back up your case.

The whole issue of RBT testing is a complete joke. The methods adopted in other countries are far superior while still using similar equipment. The DVSA are making a meal of it as a result of the Bath tipper case which presented what some considered at the time to be relatively quite questionable evidence relating to brake efficiency. One can obtain pass figures at 11 am and the same vehicle will fail at midday. The axle weights recorded by the RBT are often completely wrong making the vehicle up to two tons heavier than it is. This on their official equipment. Yet I can go to a relatively small Commercial repairer who has his RBT calibrated every six months at considerable expense and the figures are spot on.

The DVSA have made a song and dance about RBT and that it should be carried out in a loaded condition, yet when tri axle trailers were first introduced they found their load simulation equipment incapable of imposing enough weight, so they took the cheap option and allowed these trailers, which can be plated for as much as 40 tonnes, to be tested unladen.