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Originally Posted by LarryBible
Here's what I think has happened. The MC went out, (I would feel more sure of this if you said that there was fluid on the booster end of the MC when you removed it.) At that point you began bleeding using your wife as assistant and the engine NOT running. This means that you had very little pressure at the wheels when bleeding, so you ended up with air.
You THEN replaced the MC, but could never get it properly bled because again you bled with engine not running. Engine running will give you the pressure you need due to the booster helping things along. Some power brake cars require this and some you can get by without the boost. If you have a 300 pound weight lifter on the pedal, then you could probably get by without running the engine.
If you have indeed been bleeding with engine not running, you will need to start the engine and roll down the windows so that your wife and yourself can communicate over the engine noise and then bleed.
I've been there, done that with this whole scenario.
Good luck and Merry Christmas,
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I've never had a problem flushing my brake system with the engine off. If you open the valve when you order your "slave" to "push down" the pedal will easily go to the floor because the valve is open and the fluid will flow freely without pressure buildup.
THESE MERC M/C RESERVOIRS ARE TRICKY! It may appear to be full, but the back reservoir may be EMPTY! You have to look on the inside (side facing the engine) to see the rear reservoir level.
Also, I've found that I have to fill the res. to at least the bottom of the fill neck and then wiggle the res. back and forth sideways to get fluid to fill the rear res.
I alway siphon the front res., but the rear res. is tough to siphon. I don't have a tube small/flexible enough to reach it. I usually start by bleeding the rears while watching the inside on the reservoir to observe when the fluid gets to a minimum level. I have screwed up and sucked it dry. The sound is unmistakebale, so it takes a lot more bleeding to purge the air.
Once the rear res. is down to a minimum level, I siphon the front res., then fill with fluid and wiggle the res until I can see that the rear res. is full. Then I start bleeding and refill using the same procedure when both get to minimum level. After about three or four of these cycles and a quart of fluid, I am satisfied that the system is satisfactorily flushed.
Duke