[Vwdiesel] ALH vacuum pump

[Tad]

I'd check that hard plastic pipe - seems to get pretty brittle over time.

On Wed, Jun 16, 2010 at 11:29 AM, S P SHERMAN <spsherm at msn.com> wrote:

>
> Symptoms are loss of "power" brakes after long coasting times at idle.
> Brakes seem fine at higher engine/car speeds, but if you coast a long way
> say in a parking lot, the brake pedal will be hard, and no power assist.
> Since the symptoms appear to go away as soon as the engine is run at higher
> rpm for a bit, I've been assuming it is a vacuum leak somewhere that is
> significant at low rpms but overcome when the rpms are higher.
>
>
> I've checked the hoses and they seem OK, but might be a hard to find
> split...
>
>
>
> From: tadc at europa.com
> Date: Wed, 16 Jun 2010 11:00:51 -0700
> Subject: Re: [Vwdiesel] ALH vacuum pump
> To: spsherm at msn.com
> CC: vwdiesel at vwfans.com
>
> Loose nipple on the pump is normal... at least mine does it.
>
>
> What symptoms lead you to the vacuum leak conclusion?
>
>
> When my 01 Golf developed intermittent loss of boost, it turned out that
> the fat hose coming off the pump had split right along the hose clamp.  It
> wasn't immediately obvious from looking, but when I would get "on it", the
> engine would move enough to open up the split and dump all the vacuum,
> causing loss of boost control.
>
>
> Another likely possibility is the hard plastic hose going to the brake
> booster.  Mine was split along the backside at both ends and probably
> leaking pretty good, but it wasn't obvious until I took it off.  That hose
> is also $$$ to replace with OEM, but I just used a similarly-sized rubber
> hose, and it seems to work fine... however others have argued that it
> "could" collapse and cause loss of brake boost.
>
>
> On Wed, Jun 16, 2010 at 10:42 AM, S P SHERMAN <spsherm at msn.com> wrote:
>
>
> My '00 Golf has a vacuum leak somewhere. I've done a quick inspection of
> the vac lines with no obvious culprits. One thing which I found that seems
> suspicious is that the  nipple on the vac pump itself is loose (the one the
> main vac lines goes on); it rotates and has some wobble where it enters the
> case of the pump.
>
> My question is, is this normal? Shouldn't the nipple be tight on the pump
> body? And if it is not right, does this nipple screw into the pump body or
> can it be tightened again?
>
>
>
> Thanks
>
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