it's one thing after another lately now!!first it won't pass emissions(o2 sensor,egr likely)now whats going on is of course something in all my years of cars has never happened before(it figures) maybe someone can help or give me an idea please,thanks (92 merc. grand marquis-4.6)
there seems to be vibration and buzzing sound coming from appears to be my master cylinder or area within,but it's intermintent,maybe a few times every hour or so,at times also the anti-lock brake light will also flash a few seconds,at the time this sound and vibration happens(useally just a few seconds at a time)the brakes lock up and get hard and vibrate,the brake peddle will useally feel like it's being forced up, qquestion?besides of course knowing what's going on,is there a problem of maybe the brakes going all the way out??a friend told me it was possible that the master cylinder was the culprit,maybe a collapsed brake line,then a buddy who was a parts man at a dealership said something to the fact that there was some kind of brake module under or around the master that could be the culprit. any ideas thanks bob