2007 Q7 4.2 power brakes

[Dave Fain]

It seems that many modern Audi, Mercedes, BMW, etc use vacuum pumps instead
of drawing vacuum from the engine.  It turned out to be cracked plastic
lines.  All is well now.
Dave

On Tue, Dec 11, 2018 at 1:02 PM Cody <cody at 5000tq.com> wrote:

> In order of most likely to least, I would suspect:
>
> -vacuum supply issue. I forget if they have a venturi vacuum valve, but if
> they do it could be clogged
> -bad check valve at the booster
> -bad booster
>
> -Cody
>
>
>
>
> On Tue, Dec 11, 2018 at 2:56 PM -0500, "Dave Fain" <kf21857 at gmail.com>
> wrote:
>
> The brake power assist on my Q7 seems to be failing.  I had to make a quick
>> stop the other day and really had to stand on it.  My wife is nervous about
>> driving it.  Any suggestions as to what to look at?  No obvious vacuum
>> leaks.
>> thanks,
>> Dave
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