[Es2] Es2 Digest, Vol 55, Issue 1

[Bernie Benz]

If the calliper and thus the pad is not parallel with the rotor the  
pads will first touch, one side at the nose of the pad, the opposite  
side at the tail of that pad. Thus, maybe could squeal until warm  
seated. Centering the caliper over the rotor is of less importance  
unless excessive.

Bernie


On Jul 30, 2008, at 8:17 AM, Ben Klumper wrote:

> Bernie,
>
> I haven't actually done this, although I don't see why they  
> wouldn't be lined up properly as it's a pretty simple bolt-on mod  
> with OEM parts. Unless of course something was bent, but I can't  
> see that. I'll have to take a close look at it. The strange thing  
> is that the noise happens when the brakes are cold. I could  
> understand hearing a noise after repeated hard braking due to  
> expansion and fouling, but this is beyond me.
>
> Ben
>
> ----- Original Message ----- From: "Bernie Benz" <b.benz at charter.net>
> To: "Ben Klumper" <bklumper at mdbworld.com>
> Cc: <es2 at audifans.com>
> Sent: Tuesday, July 29, 2008 3:04 PM
> Subject: Re: Es2 Digest, Vol 55, Issue 1
>
>
> Ben,
> Have you checked and are sure that the calipers are accurately
> centered over the rotors and that they are parallel with the rotors?
>
> Bernie
>
>
> On Jul 29, 2008, at 1:13 PM, Ben Klumper wrote:
>
>> Bernie,
>>
>> The calipers are fixed monoblocks that were purchased used but in  
>> like-new condition. I haven't had them overhauled but all pistons   
>> move freely and the dust boots are in good shape. I've kept the   
>> stock hydraulic assist. I'm going to try a different set of pads  
>> to  see if that solves the initial bite problem. By the way,  
>> anyone  have a good source for Ferodo DS2500 pads?
>>
>> Ben
>>
>> ----- Original Message ----- From: "Bernie Benz" <b.benz at charter.net>
>> To: <bklumper at mdbworld.com>
>> Cc: <es2 at audifans.com>
>> Sent: Tuesday, July 29, 2008 2:13 PM
>> Subject: Re: Es2 Digest, Vol 55, Issue 1
>>
>>
>> Ben, are the 996s fixed or sliding calipers, i.e. on guide pins?
>> What’s the caliper overhaul history? Is the power assist hydraulic,
>> ala 20Vs, or vacuum powered? Must be hydraulic as you mentioned the
>> accumulator. I doubt that there is anything wrong with the MC if you
>> don’t have a sinking pedal when brakes are applied, and your
>> hydraulic system is clean.
>>
>> Bernie
>>
>>
>> On Jul 29, 2008, at 12:00 PM, es2-request at audifans.com wrote:
>>
>>> Message: 1
>>> Date: Mon, 28 Jul 2008 13:57:57 -0600
>>> From: "Ben Klumper" <bklumper at mdbworld.com>
>>> Subject: [Es2] brake pedal feel
>>> To: "eS2 List" <es2 at audifans.com>
>>> Message-ID: <C0EECCBB59024B6EB24599D92C93F17C at MDB.local>
>>> Content-Type: text/plain; charset="iso-8859-1"
>>>
>>> Anyone have any suggestions as to how I can increase initial   
>>> 'bite'  and decrease pedal effort when braking? The brakes have   
>>> excellent  stopping power but it requires quite a bit of push.  
>>> The  brake pedal  doesn't have a lot of travel and doesn't feel   
>>> spongey. It's quite  hard in fact. Feels like not enough  
>>> hydraulic  assist. The pressure  accumulator is new from three  
>>> years ago.  Front brakes are 996  calipers w/ stock Porsche pads  
>>> (Pagid?) over  323x30 rotors. Rears  are urS4 calipers w/stock S4  
>>> pads over  280x25 rotors. This has not  been a progressive  
>>> problem - it's kind of always been like this,  even with the  
>>> stock brake set up.  Could it be that the MC is worn  out? No  
>>> signs of leaks at all.
>>>
>>> On a side note relating to the brakes, during prolonged highway  
>>> cruising I get a bad intermittent hum/high frequency vibration   
>>> from  the front left while traveling in a straight line. Only   
>>> comes on  after about 45 minutes to an hour on the highway.  
>>> Never  in the  city. I can make it go away by touching the brakes  
>>> or by  turning  the wheel slightly left or right, but then it  
>>> reappears a  few  minutes later. Changing the wheel bearing did  
>>> not solve the   problem. The folks on the S2forum know of this  
>>> problem and it  seems  to be quite common for those who have done  
>>> the 996 upgrade.  Anyone here experience this? Any known  
>>> solutions? Anyone know if  this  problem is common in Porsches?
>>>
>>> Thanks,
>>>
>>> Ben
>>
>