brake weight

i use the brake test weight when my braketester bhas given the weight ( atl test), i use presented weight if comp 2 has given the weight, am i doing this wrong

Do all atl's measure the weight.
? Also I thought it was just the weight of the axle that's In the rollers?

I'm quite certain one of the points of ATL is that they measure the weight.

Exactly motman, the presented weight. That is the weight to be used by ATL stations.

My understanding is this (class 4)...if the system is giving you the "Brake test weight" ( in the attachment picture 1680 kg)this is the weight for brake performance test which you must calculate accordingly, however ,say, you are testing a camper which is with a full water tank food, luggage etc (almost its DGW )and if you have an ATL brake tester which can measure the presented weight then you choose "Presented weight" and calculate accordingly, occasionally there will be some cars which the system does not know the weight "Not known"(mostly private imports), in that case find out its DGW from the manufacturers plate (usually third highest one)count the number of passenger seats X 100 ,deduct the number from its DGW, that is roughly the weight you must use for Brake performance. As the manual says more than half of the wheels lock and non locking wheels indicating satisfactory effort it is a automatic pass . And failing all this "a further brake test using a decelerometer to determine the brake efficiencies must be carried out " says manual ( I personally do not like decelerometer test,few years ago I nearly went through the windscreen of a bus during decelerometer test)Having said all this brake weights are no problem for class 5 DGW/MAM and class 7 DGW

If over 3 wheels lock on foot brake and both lock on handbrake you don't need the weight anyway

When I'm back in work tomorrow I will see if it measures may even post a picture lol excuse my lack of intellectual knowhow but how can it weigh a vehicle with only two wheels on at a time?

Mine are usually fairly close to the VSI weights too.

I don't know about others but my boston set up weighs the front and then the back markmotman.

I've had my atl installed for 8 years and I have had to get it re-calibrated 3 times, not too bad, but when it has gone out it's been by a huge amount.