Member, Sport: On DSC: On (>100 posts)
Join Date: Jan 2012
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HAPPY HOLIDAYS m5board!!!!
My kids are grown and live out of state so Xmas is quiet here now. We will be all meeting up in Virginia in a few days for my 70th birthday at a fine Three Star Michelin restaurant outside DC.
Life is good!
Good news that you got your Beast up and running right. Nice having a spare part to swap in.
When I ran both INPA and ISTA+ software, I could hear all the clicks and pump action so I don't think ABS/DSC unit is at fault. I am still waiting to receive the new wheel speed sensors (next week).
I included some pix of the MC.
Yesterday after getting the rear calipers rebuilt and installed and all calipers bled, I decided to take another look at the Master Cylinder (bleeding). I really wish BMW designed in a easily accessible bleed screw on the MC. There is not much space to reach the metal tube fittings (what were they thinking?). With the MC in the car, I was able to install bleed fittings on the port facing the drivers side and the port at the front end with hoses to the reservoir. When I pumped, I did see air bubbles and then none. I pumped, pumped and pumped many times. I wanted to be sure air is out. Then I did another power bleed of the calipers. With the car up on a lift, I pumped the brake pedal and held it, started the engine and I could push the pedal way down. Before I started the car, I could slightly move the calipers slightly left and right. After running the engine and working the brake pedal, there is no side to side play. There is some clamp up, but the pedal moves too far down. If there is STILL air in the system, I don't know where.
Still a problem somewhere...
I am looking for an answers to these questions on bleeding a Master Cylinder.
1. The M5 MC has three ports. Do I put bleeding kit fittings on all three ports and run all three hoses up into the reservoir and then slow pump the MC cycling the fluid around and any air out? My MC is brand new OEM $$$.
2. If this is done in a vice (bench bleed), doesn't air get in once the bleed kit fittings are removed? How much time do I have to hook up the metal tubes, or that is not an issue?
3. There is so little room to access the MC mounting nut on the passenger side of the MC, I had to have the reservoir removed. More time and major PITA! None of my web searches showed removing and replacing the MC and Booster as a unit and if ports are open, is fluid running out and air getting in?
IF I decide to remove the MC and the Booster as an assembly, how do I keep air out until this is reinstalled? I think it would take me fifteen or more minutes to position this and reconnect the metal tubes. There is not much room in there!!!
Long post, but I hope to get some answers and advice.