Brake Pedal To Floor

[tim385]

RHD cars have a residual valve on the line that supplies the rear brakes(it is at the rear of the booster) . Due to our dual booster system our brake system is set up differently, there is no residual valve in the master cyl.All of our master cyls (std ,E12, E21) have two feed lines going in (from the resivour) and two metal lines going out .One line to each booster. One booster supplies 1 piston(each side) on the front and the other booster supplies the other front piston and the rears.I also think some of our master cyl diameters are different to the LHD cars.Maybe this has something to do with the extra booster.Must do some measurements one day to clarify this as well.The system I describe is what a lot of the RHD guys use when going boosterless in their race cars.I also dont know if there is a leverage difference between the top swung pedals of a RHD car and the floor mount of a LHD car.I suppose what may work on a RHD car may not necessarily work on a LHD car.

[M3M3]

that is the key.  we have to clarify if the advice is for RHD or LHD.  big difference in the setup.

[Hans]

So where did we end up on newness of MC? If it is new, then I'd do a really thorough bleeding, including if possible the bench bleed. I've used pressure bleeder, but sometimes I think you need to a few good old pedal pumps to get bubbles loose.

[Koblenz]

AW Sheet!  Its new and was a royal pain to install.  One of the fittings was stripped but then replaced.  So it sounds like I need to start by filling it on the bench.  Now that being said, if its installed can I disconnect the top hoses, crack the fittings and fill accordingly? 

 

OR am I better off to remove, bench, then re-install? Also who makes a good pressure bleeder?

 

Really appreciate the help guys.

 

BTW, LHD

Edited September 24, 2013 by Koblenz

[M3M3]

if it is already on, leave the reservoir fills connected, make sure the front of the car is up in the air so the the front of the MC is higher than the back, put pressure bleeder on, and crack the output fittings a bit to get the air out.  should not take much.  bench bleed best first step, but you should be able to get the air out this way.  (this is tim's "step one")

[Koblenz]

Thanks. It seems like there should be a "12 step: program when you own an 02. Thoughts on a particular pressure bleeder?

[M3M3]

"Motive" brand bleeder.  this is basically the hobby shop standard.  it is marketed under that name and several bmw parts houses sell it rebranded under their own name.  it is pretty inexpensive.  there are instructions out there for making your own, but it is cheaper and easier to just buy a Motive one.

[Koblenz]

Thanks once more . Looks like my next purchase is a pressure bleeder.

Edited September 25, 2013 by Koblenz

[williamggruff]

+1 on the Motive pressure bleeder.  It's a real time saver, and it makes bleeding the brakes alone a breeze.

['76mintgrün'02]

+2 on the Motive. I used mine without putting fluid in it. Just used air to push and topped the fluid off as needed.

[M3M3]

+2 on the Motive. I used mine without putting fluid in it. Just used air to push and topped the fluid off as needed.

that is how i use mine.  dry.  just as a pressure source.

 

saves cleaning!