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4076simon
Newbie


Joined: 10 Nov 2019
Posts: 8
Location: West Sussex


PostPosted: Fri Feb 14, 2020 8:00 pm    Post subject: 996 C4S ring of rust on front discs Reply with quote

Had my 996 C4S since September. Always thought a long drive with some enthusiastic braking would get rid of ring of rust on discs. Just driven 150 miles to Devon where she’s going in for some paint and the rust ring about 1 inch deep down from circumference is still there. Previous owner put new callipers on, Something is not right. Any thoughts? Thanks!
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2002 996 C4S Lapis Blue
 



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kas750
Shanghai


Joined: 31 Mar 2013
Posts: 4659
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Fri Feb 14, 2020 8:02 pm    Post subject: Reply with quote

You may get rid of that if you fit new pads or cane the arse off it for a while.
No rustys rings on any of my cars Hand Very Happy
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17349
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Feb 14, 2020 8:05 pm    Post subject: Reply with quote

Looks like the wrong pads are in for those discs/calipers. Pad should run out all the way to the edge of the disc......and it isn't. Dont know
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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DarthFaker
Trainee


Joined: 13 Jun 2019
Posts: 93
Location: 1999 Carrera 4 Aerokit


PostPosted: Fri Feb 14, 2020 9:22 pm    Post subject: Reply with quote

Deffo something wrong there. Mine are shiny all the way.
 
  
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kurlykris
Magny-Cours


Joined: 30 Jun 2014
Posts: 2656
Location: Warwickshire


PostPosted: Fri Feb 14, 2020 10:01 pm    Post subject: Reply with quote

Definitely something not right there 4076simon, you should have a very small lip of maybe 2mm wide at the circumference of the disk and another on the inner diameter as the disk face meets the weather groove around the top hat diameter. Here is a photo of mine on the Boxster the day I swapped them all for new ones Thumb

Thumb
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1998 996.1 C2 3.4 with "Aerokit Cup"
2006 987.1 Boxster S 3.2 sport chrono
2010 Mercedes E350 AMG Sport

 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7587
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Sat Feb 15, 2020 12:38 am    Post subject: Reply with quote

When you say new callipers, did they fit the right ones? Are they the Turbo spec ‘big reds’?
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"911- the guilt-free supercar"

Current: 2003 C4S Coupe, seal/black

Ex: '02 C4S Coupe, '96 993 Targa, '88 Carrera Sport Coupe
 
  
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4076simon
Newbie


Joined: 10 Nov 2019
Posts: 8
Location: West Sussex


PostPosted: Sat Feb 15, 2020 9:30 am    Post subject: Reply with quote

Thanks Guys, previous owner has now assured me that new callipers were exchanged recon C4S/turbo , so we’ll change pads and go from there. Can’t think discs would be too big?
Cheers
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2002 996 C4S Lapis Blue
 
  
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911Time
Spa-Francorchamps


Joined: 25 Sep 2018
Posts: 273
Location: Staffordshire


PostPosted: Sat Feb 15, 2020 11:09 am    Post subject: Reply with quote

The disks can't be too big.

I would remove one of the existing pads, check the surface of the pad for even wear then measure the width of the pad, next measure the swept area on the face of the disk - obviously it should match - if not they're the wrong pads. Simples. Very Happy
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Mark


I'm not a perfectionist - I just want everything done 'Right' Wink

Current: GT Silver 991.1 C4S with a few 'special bits'. Previous Owned: C63 Estate, BMW e92 330d Coupe (700Nm/Custom Exh/Map/BBK/Quaife/Breytons), ML63AMG, Alpina e46 B3S Coupe, Alpina e36 B3 Coupe, Lotus Excel SE, Alfasud Green Cloverleaf Ti, Lancia HPE, Capri 2.0S, Marina 1.8 (don't laugh it was my first road car). Bikes: Suzuki TL1000R and BMW R1100S AC Schnitzer.
 
  
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Gray79
Silverstone


Joined: 28 Apr 2019
Posts: 141
Location: Scarborough


PostPosted: Sat Feb 15, 2020 12:50 pm    Post subject: Reply with quote

This thread has come up just as I have got mine back from mot and service, they changed the front pads and I have exactly the same around the outside of my discs. I have checked the part number of the pads they used, and they should be correct for the car. I haven’t had chance to take the wheels off and have a look what is happening yet. Dont know
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997.1 Carrera 2S
 
  
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Teffers
Monza


Joined: 28 Dec 2009
Posts: 169
Location: West Mids


PostPosted: Sat Feb 15, 2020 4:44 pm    Post subject: Reply with quote

I changed pads all round last week. One of the fronts had started to break up - tell tale sign was band of rust on the disc there there was no pad surface to make contact!
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