[Es2] Es2 Digest, Vol 55, Issue 1

[Bernie Benz]

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
>