After the recent discussions on social media regarding LSD's, I got thinking again about how the ATB works.
At MOT time I have always asked for a 'road test' with an accelerometer.
But, I've been thinking that due to the way the ATB works, the standard brake test on rollers should be ok...
So I contacted Quaife.Thank you very much for your enquiry;
The ATB diff will be absolutely fine on a normal brake test.
For further peace of mind, Ford has used them in every version of the Focus RS, and are still fitting ATB diffs as standard equipment in the current Fiesta ST, and the new Transit Trail and Puma ST.
So no issues with MOT tests!