My last brake flush was 11/2007 @ 47,600 miles. I now have 62,000 miles and 4 autocrosses. After several weeks of very very cold weather my brakes are not as firm as they used to be. Brake fluid is Motul RB600. Can I get by with a brake bleed or should I flush them completely? If I flush I would probably use ATE Superblue just for ease of color change.

 

Full flush. Motul 600 absorbs moisture from the air like crazy and you're well past the expected life of it. Super Blue is much better in that regard... there's a current thread going on this very topic on mu.

You'd like to think Motul would last longer because it's more expensive... but not true.

 

+1 Flush

 

I'd agree and add that this fluid is not ideal for your needs. If you do not truly need the added temperature range provided you'd be far better off with a more stable DOT3/4 fluid. The boiling point of the fluid now after such time and miles is likely below the stated dry temp (obviously) and below that of a more stable, lower dry BP fluid which would handle the longer life and be less susceptible to moisture.

Boiling fluid in an AutoX event seems extremely remote to me anyhow.