99 ML w 149k miles. BAS/ESP and ETS lights came on today. I have noticed recently a whoosh sound when i release the brake..... a vacumn type of noise. I have also noticed the brake pedal does travel a little when i am sitting at a stop sign. I think I may need a master cylander. Hoping I don't also need a booster. Is the booster an all or nothing type of repair or do parts get replaced.
Had brakes flushed @5k miles ago.
Am I in danger driving this? i feel no loss of power the manual talks about.
Thanks very much in advance for ideas.