E28 M5 (E34 M5) Squishy brakes

[Jeff Pharr <pharr@xxxxxxxxxx>]

I will place my money on number 1. 

It is real easy (especially when using one of those one-man bleeders) to
let the fluid level in the reservoir get too low and re-introduce air
into the system. I have sucked the reservoir empty with the ez-bleeder
more than once so I know it can be done... It is also possible that you
did not completely re-tighten one of the bleed valves which could also
allow air back into the system.

I would go back and re-bleed the system one more time, looking for leaks
at each of the bleed valves as you go, and make sure that you keep the
reservoir topped up at all times.

- --Jeff



> I replaced the fluid and pads this weekend with Metal Masters and
> Castrol
> Dot 4.  I used one of those One-Man bleeders (the type that attaches
> to the
> bleed valve and has a valve at the other end that allows fluid to flow
> out,
> but not in).
> 
> I did the bleed until clean fluid flowed out of each wheel going from
> the
> closest brake to the furthest (I know this is against conventional
> wisdom,
> but the FAQ's advised doing it this way and it makes sense to me).
> You
> should have seen how cloudy the old fluid was.  Yuk!
> 
> I now have squishy brakes and I'm hoping to isolate the problem.  It
> could
> be 3 things as I see it:
> 
> 1. Crappy bleed job
> 2. Diff between Metal Masters and Jurids
> 3. ABS
> 
> 

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