You need a good 100psi in
You need a good 100psi in those 23c’s, if you find you are loosing more than 20 spi over a month, you might need some more inner tubes. Also inspect the tyre itself while deflated for glass that might have worked its way through the carcass. Common commuting headache.
As for the brakes, we just basically need to know what brakes are fitted to that machine. Shimano’s newer dual pivot style calipers are normally more than powerful enough to lock road wheels up, even in the wet. Anything more powerful is unnecessary with slick 23c contact patches to work with, though road disks have other debateable advantages.