[skidlids]

Most manufacturers recommend a bedding in procedure for their Race pads and how you are meant to do this at Race meetings where you have no free or untimed practice I don't know. I had to scrub a new front tyre during timed qualifying and a New rear in race one. I had discussed with friends about changing my pads but decided against it as I was worried about getting them bedded in according to the instructions on the packet they come in
I use Ferodo CP911* Race pads and providing I follow the bedding in procedure they always work well for me, but this procedure is not something I want to be doing during the only timed practice especially when I'm already scrubbing in a new tyre.

Got this off the web
WHAT DOES "BEDDING-IN" BRAKE PADS REALLY MEAN?
..... Looking at the ground surface of a new brake pad and rotor [new or used] under magnification, the surface looks like a bunch of hills and valleys. Until these parts are mated, only the peaks are making contact. If you try to use the brakes hard before they bed-in, you run the risk of over-heating and carbonizing the surface of the pad. This means performance will suffer dramatically and a glazed surface will likely result...you'll probably hear your brakes complaining via a loud annoying brake squeal. ............. Allow some time to bed-in your new brakes by following the manufacturer recommendations and you'll find they'll work much better.
• Racers: contact us for specifics.

well Griffs pads were certainly carbonised

Luckily I carry a few spares with me to race meetings
for Griffs bike we used my spare Clip-ons, Brake Master cylinder, my Fibreclass kit and my tub of P40 fibreglass filler, Fil2 donated brake pads and a caliper and rear brake lever came from AK

I lent Paul Payne a rear wheel (one where the bearings don't fall out) and Dominic Clegg a front disc

A couple of days before Senna3 had my 16T front sprocket and i even got another Shell Oils sponsorship package out of the van, which Ali proceeded to use on friday evening to make sure his bike was ready for a race win on saturday.