[Vwdiesel] Drone/boom in the back

The President quantum-man at hotmail.co.uk
Thu May 24 22:13:49 EDT 2007

Found the problem of the sonic boom... inner bearing also lumpy to turn. 
Amasig how it resonated at 30mph and again at 55 to 65... Coupled with some 
holes in the exhaust most confusing and it was affected by turning the 
steering wheel!



>From: "The President" <quantum-man at hotmail.co.uk>
>To: vwdiesel at vwfans.com
>Subject: Re: [Vwdiesel] Drone/boom in the back
>Date: Mon, 21 May 2007 10:12:30 +0000
>No pumping neccessary.
>I wonder if the regulator is at fault and applying too much power to the
>rear? I must find some gravel to test this I think its 2 to 1 power ratio. 
>assume the test gauges need to screw into the bleed nipples. I wonder if
>oxygen welding gauges would do?  I will take a drum off another car,
>although it may be the stub undersized.
> >From: LBaird119 at aol.com
> >To: vwdiesel at vwfans.com
> >Subject: Re: [Vwdiesel] Drone/boom in the back
> >Date: Sun, 20 May 2007 19:17:35 EDT
> >
> >   Worn drums and pads will cause you to need to pump the pedal
> >once or twice to get brakes.  There really isn't an "operating range"
> >on the wheel cylinders unless you get out so far they blow the
> >seals clear out.  Odd to have a new one leak, you probably flushed
> >the fluid when you changed it.  Your rear braking will be severly
> >diminished with flui on the shoes.  Would be a good idea to put in
> >new cylinders, shoes and fluid and see what that does for you.
> >Sounds like new bearings and seal would be good at least on the
> >one side!  Wobble even with the nut tight soulnds like a bad
> >bearing and that could be your noise.  Jacking up and spinning
> >the wheel MIGHT give you a clue.  Not like you can spin it very
> >fast though.
> >   The other things that can make a rear noise would be exhaust
> >related.  You can tell that simply by making the noise, letting off
> >the pedal and pushing in the clutch.  If the noise persists then it's
> >not exhaust.  If it goes away then consider a bad muffler, another
> >hole, bad hanger or something bent and rubbing.  Not likely it's
> >a frequency droning since it didn't do it before.  Dad's Passat has
> >a droning at about 75mph that lasts for about a 3mph range.  That
> >one's exhaust "tuning".
> >      Loren
> >
> >
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