"our planes have the carbon brakes, but I find it strange that the brakes get up to 3-4 on the temp reading after a landing-this seems high to me,"
Seems a little high to me, too. Is the whole fleet doing this... or are you flying the same aircraft every day? Are particular brakes reaching this level.. or are all brakes going this high?
Talk to your engineers. Make sure you have the right model A/B / Antiskid computers fitted...and they are at the correct mod status.
Rgds.
Q.