Ferrari Mailing List: Re: 328 master brake cylinder rebuild

[Jeff Greenfield (coyote]

No, not in this case.

A weak or leaking vacuum booster will cause a harder pedal, as well as other
symptoms caused by a vacuum leak (poor idle, rough running, etc) but will
not cause the pedal to slowly sink under light pressure. This is a classic
case of an internal seal in the master leaking internally.

Jeff

-----Original Message-----
From: Rick Lindsay [mailto:rolindsay [at] yahoo.com] 
Sent: Wednesday, June 06, 2007 12:47 PM
To: Jeff Greenfield
Cc: The FerrariList
Subject: Re: [Ferrari] 328 master brake cylinder rebuild

I just re-read Rui's note and the thing that hit me
immediately, that I hadn't seen before, is the brake
booster.  If there is a leak in the booster, the
valving or a vacuum line, the driver will experience
these kinds of pedal fluctuations.  Worth considering
before tearing a master cylinder out...

rick

> From: "Rui Gigante" <rui.gigante [at] gmail.com>
 
> The symptom is that when stopped at a light and
> slightly pressing the pedal,
> it starts to "give" about 30 seconds later, but not
> always...
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