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steveoz
Monza


Joined: 21 Mar 2011
Posts: 162



PostPosted: Tue Mar 22, 2011 9:54 am    Post subject: Hot Discs? Reply with quote

I haven't made any useful posts for a while, but I've been collecting some pics.

Anyway, I noticed my front pads / discs smelling a little 'hot' the other day. Cheking the pads they were fine (fairly recently changed anyway). The discs were changed not all that many miles ago as well. Upon further inspection I noticed that the vents and drilled surface of the discs were blocked with brake dust.

Taking the correct sized drill I set about drilling out the holes, turning the disc around and giving it gentle tap with a rubber mallet to get the dust out, and there was a lot!

After completing and testing, the smell and heat had gone! Later looking through the history I found out that this is common practice for OPC's to do. Just thought I would post up as it may be worth checking sometime.





 
  
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Roro
Long Beach


Joined: 01 Oct 2010
Posts: 6329



PostPosted: Sat Jul 02, 2011 4:20 pm    Post subject: Reply with quote

I washed my GT3 today and noticed how brake dust gathers so quickly - I had new discs and pads fitted only about 3 weeks ago and already I'd say about 5% of all the holes are blocked up. How easy is it to drill the dust out? It looks like you didn't need to take the discs off, just removed the wheels?
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2007 997.1 GT3
2017 F87 M2
 
  
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oz996
Österreich


Joined: 22 Sep 2010
Posts: 926
Location: Sydney

1998 Porsche 996 Carrera 2

PostPosted: Sat Jul 02, 2011 4:56 pm    Post subject: Reply with quote

I had the car jacked to bleed the brakes a few weeks ago and since both wheels were off on one side I hit the rotors with the pressure washer to clean out the vent holes. In 30 seconds they were very clean and I noticed that I didnt end up with the usual muck on the inside of the wheels after doing the next car wash.

I think I'll do this each time I swap the track wheels off the car from now on.
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Roro
Long Beach


Joined: 01 Oct 2010
Posts: 6329



PostPosted: Sat Jul 02, 2011 5:08 pm    Post subject: Reply with quote

I tried the pressure wash through the gaps in the wheels but didn't seem to work, the dust seems really caked in! I will try the drill in a few more weeks I think.
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2017 F87 M2
 
  
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oz996
Österreich


Joined: 22 Sep 2010
Posts: 926
Location: Sydney

1998 Porsche 996 Carrera 2

PostPosted: Sat Jul 02, 2011 8:07 pm    Post subject: Reply with quote

Roro wrote:
I tried the pressure wash through the gaps in the wheels but didn't seem to work, the dust seems really caked in! I will try the drill in a few more weeks I think.


I don't like to get the pressure washer head close to the paintwork or wheels so it's not nearly as effective as what can be achieved with the wheels off and the washer head close to the holes in the disk.
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oze172
Suzuka


Joined: 04 Jun 2008
Posts: 1245
Location: Hampshire


PostPosted: Sat Jul 02, 2011 8:08 pm    Post subject: Reply with quote

They clog up so quickly, especially on track duty or bedding in.

I got fed up with that and cracking so no more drilled discs, slotted all round Grin

Don't forget to do the inside holes that don't always align with the outside face holes..only available in a small gap in the heat shield, unless you cut them back too Question
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steveoz
Monza


Joined: 21 Mar 2011
Posts: 162



PostPosted: Sat Jul 23, 2011 3:26 pm    Post subject: Reply with quote

So very true, even OEM disks from the OPC don't quite line up, you have to tilt the drill slightly and do all holes away from the guard.

It's such a simple task, but something that some owners may overlook, and it's a great way to make sure you keep disc temps down and your breaking more efficient Smile
 
  
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angry
Montreal


Joined: 30 Sep 2008
Posts: 602
Location: East sussex


PostPosted: Mon Jun 23, 2014 4:52 pm    Post subject: Reply with quote

Get yourself a little compressor and a air line with blower.
I blow my discs out before every Ring trip/trackday and after
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993 C2.
 
  
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8248
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Mon Jun 23, 2014 6:30 pm    Post subject: Reply with quote

It is best to use a drill to clear the vent holes as blowing out or jet washing as some others do only really clears the outside of the disc and also won't remove any of the rust build up inside the hole.
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2933


1999 Porsche 996 Carrera 2

PostPosted: Mon Jun 23, 2014 6:33 pm    Post subject: Reply with quote

I "cooked" my brakes on a recent track day, and yerp the little holes were all blocked up with dust.

Fluid was over 2 years old so new fluid straight away and clear out the holes before the next track day.

Will be going for groove discs when they are needed.
 
  
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