<VV> Brakes - where did the air come from?

[Doug Mackintosh]

Hey brake gurus!  I have a puzzler (to me; I'm sure to
you guys it will be very clear - all 10 different
answers!).  

My daughter's Spyder has had excellent brakes, a high
firm pedal, no problems since we rebuilt the system in
2000.  At that time we installed a dual master
cylinder.    In the last few weeks it has started
acting like there is air in the lines.  When first
applying brakes, the pedal is low (but the brakes work
OK).  Pumping them brings the pedal up higher.  There
is no evidence of a leak, and the pedal does not sink
toward the floor when pressure is maintained on the
pedal. 

When I got ready to bleed the brakes a couple weeks
ago, I opened the master cylinder and found that the
rear reservoir (for the front brakes) was overflowing,
and the front reservoir (for the rear brakes) was low
by about the same amount.  I have not been able to
figure out what would cause that.  When we bled the
brakes we got plenty of air out, and a better pedal. 

I can find no evidence of leaks or loose connections
anywhere.  Other than the fluid seemingly having moved
from one reservoir to the other, there is no evidence
of fluid going anywhere.

1) Where is the air coming from?
2) How did the fluid get high in one reservoir and low
in the other?

Thanks 

-- Doug Mackintosh
  Corsa member since 1996
  Corsa/NC member since 1996,  Virtual Vairs member
  Corvair owner 1969-1971 and 1996-on


		
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