MOT brake test

[tvr keith]

Took the Chim for its MOT the other week. MOT tester said that as its got a limited slip diff cannot check the brakes on the rolling road as it could damage the diff.
For the brake test he put some archaic looking bit of kit in the passenger footwell which measures the G force when he braked hard; at 20mph!
A rather prititive way of doing it, but if thats what it has to be.....
I wonder whether all MOT testers are aware of this?

[zippee]

My MOT tester said the same, took it down the road to test the brakes that way.
TBH I think it shows the sign of someone who actually knows what they are talking about, your local KwikFit tester wouldn't have had a clue and put it on the rollers.

[mick_coupe]

Its called a Tapley meter....

Mick

[Cider Andy]

When mine was tested the rollers spun both wheels and measured their braking efficiency at the same time, so there was no issue. I thought all rollers worked this way, but obviously not.

[brioss]

I have had that gazmo in the footwell on my V8S MOT. I thought they used it as an excuse for a test drive.

[SwanJack]

For four years they put my car on the rollers. This year, same MOT station, they said it had to have the test drive. I think the new Dept of Transport (or whatever it is) computer system/software for MOT's flags up a particular cars' anomalies. And for all the prospective owners/doom mongers worrying about reliability issues etc. It's passed every MOT first time

Edited by SwanJack on Tuesday 4th July 18:25

[mgaut]

both of my local MOT centres refused to put the Chim on their rollers, and instead used the bit of historic kit you mentioned (decelerometer ?)

If I recall this is standard approach on LSD's and 4x4's