Wife has just bought a 23 plate car , the handbrake doesn't hold on our drive, am I correct in thinking that for the mot they should hold aster 3 clicks ?
The lower the number of clicks, the more force you can apply to set the handbrake on. If there is an excessive number of clicks, then the handbrake lever can be near vertical, so your arm has much less leverage.
When I bought my present car, it had just passed it's MOT, with 7 clicks, which I found awkward to apply fully, and near useless in an emergency. It has a combined adjuster at front, under the lever, which had been tightened all the way, a compensator, which had deformed and stretched under the strain, and independent manual shoe adjusters, at the hubs. My first job on the car, was to sort that useless handbrake out....
Some owners, had fitted new cables, thinking the cables might have stretched, rather than the compensator - cables cannot stretch, apply too much load, they simply snap.
I took the compensator out, reshaped it, to the correct shape, size, then reinforced it, then refitted it. Then I correctly adjusted the shoes at the hub, before finally setting it to three clicks at the front. Since when, my handbrake has been as good as any vehicle I have ever driven. I can lock the rear wheels moving on the road.
It turned out that compensator stretch, was due to inadequate design, and I ended up refurbishing and reinforcing hundreds of these for other owners.