also om my wifes mk4 ibiza sport. when you pull up at traffic lights & put your foot on the brake there is a high pitch noise heard from inside the **** pit???

only does it when you cruise up to the lights,stop and rest your foot on the brake?
what could it be the rest of the time driving the I.s u dont here it??
anyone?
only does it when you cruise up to the lights,stop and rest your foot on the brake?
what could it be the rest of the time driving the I.s u dont here it??
anyone?