The brake test used where I get my bikes MOT'd uses a rolling road simulation. Similar to a car MOT brake test. This method actualy causes the front forks to compress therefore weight is transfered to the front of the bike.

I suspest because the bike has two wheels, theoreticly the weight is distributed equaly 50/50 (this is not the case in the real world as you know when braking). Usualy when you brake (dry conditions) you should be applying 70% front and 30% rear. So a measure of 31% for the rear brake is good and a measure of 51% for the front in terms of 50/50 weight is good. Job done.

Where was the winch connected to the bike?

On a straight flat road do you reckon at 30mph, using your front brake only, you could lock you front wheel and release it again without losing control and without dropping below 15mph! If you can I reckon your brakes are OK.

At 60mph you should be able to lock and release the front brake about three times before you get to 15mph.  A bit like this. Fig 1 _____________           ________       ____

Back brake is the easy one. Stamp on it, then release.

PS. Don't try this at home unless you are confident with what you are trying to achieve. I take no responsibility if you bin your bike trying this.

When I was CBTing I would get the learners to push a ped on the tarmac then get them to stop the bike using just the rear brake. Then just using the front brake, then again using both brakes. Their stopping distances were a bit like the lines indicated in figure 1 above.

At the end of the day Dick, with 31% in the rear and 51% on the front you've got 82% stopping power minimun.