Originally Posted by Anything4APontiac
Sorry, forgot to mention, this is on the 93, 170k
What I'm about to suggest is real close to voodoo, superstitious behavior.
Years ago, a wrench shows up in a thread about a master cylinder failure. He asked two questions..
"Did the MC failure occur within 2 or 3 weeks after you did the front brakes?"
"When you do the brakes, do you just remove the MC cap, pull out a little fluid just-in-case...clean things up, then reset the cylinders in the calipers. Slap everything back on, replace the fluid and cap the MC and you're good to go?"
The answer was "yes" to both questions.
The wrench responded "When you reset the cylinder in the calipers, you are pushing some really nasty dirt particles back into the fluid, particularly from the rubber cover. You have to bleed a bit of the line to get it outta there. If you don't, you might get lucky once, but it will wreck the MC in fairly quick order.
You could hear the hooting from 100 ft away from your display. Until, about 15 or 20 guys show up and say "Hey my MC went, just a few weeks after I did the brakes." I would lose my MC on the '95, the next brake change around (no bleed). The next MC I lost was on the '96, following a brake job by my longtime friend, with 35 yrs at his own garage. i told him about it, and he made one of those faces that he always does.. as in "ya know there might be some truth to that, but in the real world, I've done a million brake jobs. Unless I see a mechanical flaw, I just move on. they don't go bad". We revisited that comment 3 weeks later, when I brought the car in to replace the MC.
With 3 Bonnevilles, I now have about 17 car-years total, without an MC replace.
Maybe it'* just a curse if you talk about it. Sorry, I mentioned it.