First post to the list, but long time reader and van driver.

 

After sitting over night or for any other extended length of time, my
van's break master cylinder makes a popping noise the first time I use
the breaks.  It's like there is built up pressure in the system that is
released.  It only occurs at the first hit of the break pedal and never
during driving.  Not sure if this is necessarily a bad thing, but I'm
just curious what's going on.  And, shoot, maybe it's not even the
master cylinder making the noise, I just assumed since it's coming from
under the steering column.  

 

Andrew

Portland, OR

'87 GL