This post of Mark Drillocks:

http://gerry.vanagon.com/cgi-bin/wa.exe?S2=vanagon&L=vanagon&q=&s=brake+parts+quality+question&f=&a=may+2006&b=may+2009

says a relative of his was hearing a sound like "air rushing" when
pushing brake pedal.

I hear a "whoosh" (possibly same sound?) when I push pedal down. I
assume (ed) this was a normal noise of booster.

Regardless, he mentions of Bietrix brand MC and that replacing it
solved the problem.

I doubt I'll be able to determine what brand of MC I installed, but I
am curious.

It shouldn't be failing so soon. I'll be happy if that's it and not
booster. (cha ching)

Neil.

On 3/23/10, Jake de Villiers <crescentbeachguitar@gmail.com> wrote:

> I'm pretty sure Mark posted on boosters recently - you might do a quick scan
> of the Archives...

> On Tue, Mar 23, 2010 at 10:50 PM, neil n <musomuso@gmail.com> wrote:

>> Repeated
>> pushing, I hear the booster, but pushing fairly hard, pedal will go
>> down until I hear/feel a subtle "thud" as pedal stops.