Disappearing (and reappearing) BRAKES

[Richard J. Andrews]

failing brake master cylinder?
what it sounds like to me at least.


-rich
'86 4kq


>Since I had 20 mph braking and thinking that I might have lost brake or
>hydraulic fluid, I slowly drove to the Audi dealer that (luckily) was a mile
>down the road.  By the time I got there, the brakes engaged with the pedal
>halfway down.  A check under the hood showed full fluids.  I tried pumping
>the pedal again and the top "half" just caused a slight hissing sound and
>the lower half of the pedal gave full braking.
>
>With the brakes improving (and not wanting to pay the dealer to diagnose the
>problem), I took back roads to get home.  A couple of miles from the dealer,
>the brakes returned totally to normal.  Car is back at the mechanic, but
>(without popping the hood yet) they're initially stumped.
>
>What the heck is/was going on???
>
>** Please cc: my e-mail in addition to the QList **
>
>Thanks in advance,
>
>Andrejs
>
>1988 5000sq