[s-cars] bomb time

[brian hoeft]

Very informative Tom, good reads for Steve, I was just going to say it
sounds more like he has a leaky caliper or MC and should check his brake
fluid...



On Sat, Jan 21, 2012 at 7:47 PM, Tom Green <trgreen at comcast.net> wrote:

> The classic bomb problem is the failure to retain system pressure when the
> engine is shut off.  This shows itself as the brake light remaining on
> after start for ~30 seconds.  That is the only function of the
> accumulator-retain sufficient brake pressure for emergency use when the
> engine is off.   When the engine is running and the pump has had time to
> charge the bomb to full system pressure, it does not really come into play
> unless you make very high demands that the pump can't supply and/or there
> is some other problem as well. So, you may need a bomb, but probably
> something else as well.
>
> That could be a system flush and filter cleaning or some more hardware.
>  Check out the FAQ at the UrS4/6/S2/RS2 forum on Quattroworld.com then
> don't ask questions until you have looked here.  : )   If the light is on
> at every start, probably plan on a bomb, but start by looking at the fluid
> in the hydraulic reservoir.  Check for a bright, clear olive green color;
>  pull the little plastic sleeve with the screen that drops in the reservoir
> fill hole.  The screen should be bright steel.  If it is black, that is
> rubber from seals and hoses.  Black fluid and filter means cleaning and
> flushing is overdue.  I recommend putting a 3/8" Magnefine filter in the
> return line also.  I would do this cleaning/flushing/fluid change before
> deciding what is broken from the troubleshooting discussed below.  It could
> just be junk blocking flow through the screens in the banjo bolts or
> reservoir and/or keeping a check valve in the bomb or servo from closing
> fully.
>
> The only problem with this troubleshooting procedure is without a pressure
> test on the pump output to the brakes, you don't know if a weak pump output
> is causing or at least contributing to the problem.  If the servo leaks,
> that could be the only problem, but you can't really tell if the system
> won't hold pressure so you can test the other parts.  An extra part or two
> would be no big deal for a system that has this age on it, but these are
> expensive parts.
>
> This is the place to start in the FAQ:
>
> http://members.shaw.ca/**speedtek/UrS%20chassis%20Map.**html<http://members.shaw.ca/speedtek/UrS%20chassis%20Map.html>
>
> And, this is the section to troubleshoot your system to determine where to
> start, and it is not go buy a bomb:
>
> http://www.elektro.com/~audi/**audi/hydraulic.html<http://www.elektro.com/%7Eaudi/audi/hydraulic.html>
>
>
> Here is another source for accumulators;  Unfortunately, he is out of
> stock:
>
> PARTS FOR AUDI C4 CARS (100 / S4 / A6 / S6 & S6 PLUS)
>
> The squealing brake is a brake problem, not a hydraulic boost problem.
>
>
> Cheers,
>
>  Tom '95 S6
>         '95.5 S6 avant
> Knoxville, TN
>
>
>
>
> OnSaturday January 21, 2012, at 1:05 PM, "Steve Marinello" <
> smarinello at entouch.net> wrote:
>
>  I expect to be needing a new bomb shortly, as the light now comes on
>> at.interesting times.  One observation.when it comes on during braking
>> from
>> relatively slow speeds, the brakes squeak.reduced clamping force?  I'll
>> check to see if Dave Kase is still recharging them, but I was wondering if
>> anyone knows much about where the new ones are being made.  WOrldPac has
>> Febi Bilstein bombs and there are a couple of sources with Meyle units,
>> including GR on ebay.  I'm guessing the Meyle ones are definitely Chinese
>> now; anyone know about the Febi's?  There's about a $45-$50 price
>> differential.
>>
>>
>>
>> TIA,
>>
>>
>>
>> Steve
>>
>>
>
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-- 
*       -Brian*
      [blinders off&ear <http://208.53.138.125:8068/>plugs out]