Brake Warning indicator

[Larry C Leung]

Listers;

In the process of trying to diagnose my 200Q's (MC2) drivability issues
(so far, having replaced the battery and air temp sensor, still coding
"air temp sensor and coolant temp sensor, now checking the wiring
from sensor to ECU) when under boost, the brake warning indicator
flashes intermittently, definitely coming on under boost situations, and
going off when I lift. It does not happen all of the time, thus making
this
secondary issue a little tough to figure out. Any ideas?

LL - NY