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brake discs

K

kedrick davies

PCGB Member
I have fitted zimmerman cross drilled front discs to my C4 twice already and they seem to distort within about 5K. Have any members of the forum used other discs (OEM or other manufacturer) and how have they performed - costs of discs? Look forward to replies.
 
I put Sebro discs on mine 2 years ago and have put about 7,000 miles on them which includes a dozen trackdays, which means I have used them in anger on regular occasions. I have had zero problems with them. To my eye the Sebro discs are of equal quality to the Porsche boxed ones (throw the boxes away and you can't tell which is which). AFAIK you can't get original cross drilled discs in the normal C2/C4 sizes. The ones that are available with holes are therefore aftermarket and I've heard of others that have been unhappy with the quality of these discs. To get original quality crossed drilled discs you have to buy those that fit the turbo or RS models which of course means changing the brakes and putting adaptors on. Personally I'm very happy with the 'solid discs' and find that when combined with quality brake pads and fluid that they are more than up to the job. Also they don't suffer from 'spidering' that you find on cross drilled discs.
 
I tend only to use genuine discs...and have never had a problem with the original solid discs I have also heard good reports on the sebro discs I am not sure as steve says that you can get the drilled discs OE for the front.... I recently fitted the 993 big red fronts with OE 965 3.6 drilled discs and all is still fine at the moment. (but very expensive to do but are the business) The OE 964rs rear disc is interchangeable with the original but its also quite expensive at about 180 each!!. Unless you upgrade calipers/mounting brackets etc for 993/993tt with either 968 M030 discs or 965t disc then I think you have to maybe stick with aftermarket discs if you want them drilled. Tim
 
The warped brake disk issue comes up from time to time on forums. Personally I agree with the view that it's actually a myth. Have a look at this article - [link=http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml]http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml[/link] - for one explanation. I've certainly experienced bad vibration in the past during a track day in my 964 turbo. In my case I managed to get the brakes working properly again by repeating the bedding in procedure which confirmed the view in my mind that warped disks are a fallacy.
 
I had to change the discs and pads all round and was very nervous about using anything other than OE parts after bad experiences with Zimmermans on the front of my 944 years ago, where even after replacements ended up going to OE parts to solve brake judder/wheel wobble under braking. It may have been a disc and pad combination but I could only get rid it using OE parts. However due to the enormous cost difference I though I'd try Sebro discs from Euro Car Parts on my 964 and am very pleased with them. As Steve said I could see no difference to the original parts. With this evidence I changed my Boxster's drilled discs as well using Sebro's and again am very happy with them. I used Euro Car Parts for discs and pads and can thouroughly recommend them. No affiliation BTW.
 
The ones I've heard people not being happy with the peformance of, are often described as 'cross drilled sports discs'. You can see these at this link: [link=http://www.type911shop.co.uk/shop/category_53/Cross-Drilled-Sports-Discs.html?shop_param=cid%3D%26]Cross drilled sports discs[/link] Note the difference in the hole pattern compared to OEM discs for the RS and turbo that are shown in this link: [link=http://www.type911shop.co.uk/shop/category_52/Standard-OEM-Discs.html?shop_param=cid%3D%26]OEM discs[/link] The second link also shows the standard solid discs. Both links are to Type911 who I have found very good to deal with when buying parts. Like Kevin, I've also had solid discs made by Zimmerman (easy to tell as the hats aren't painted) and had no problems with these either. I just prefer to buy Sebro now (grey painted hats) because I'm 95% certain they are OE on Porsches these days (i.e. an original part at a much lower price). I don't know who actually makes the 'cross drilled sports discs' but it seems to be these that wear badly.
 
Hi Steve, First image link not right - unless the like the front of Merc's! Personally, I think as a key performance and safety component, RS discs seem reasonable and would consider fitting them to my C4. I've not used my brakes enthusiastically or in anger yet, but very impressed anyways. Few questions though: - Are RS discs it a straight swap (i.e. no other caliper mods/replacements required)? - Cross drilled discs really that significantly different under normal use (or really only noticed on track days)? - Or maybe sticking with solid discs as is, and going instead for top brake pads (i.e. Red Stuff)?
 
First link now fixed! [:D] RS, turbo, 993, 928GTS, etc discs are all bigger and require appropriate calipers and brackets. Not to mention different proportioning valves and master cylinders. Tim has just upgraded his brakes as mentioned above so is better placed to give you all the information. Regarding cross drilled discs my guess is that their 'performance advantage' comes from them being lighter and cool quicker. Though the latter is lost if you don't clean the brake dust out of the holes regularly. The RS brakes better performance comes mostly from both the discs and pads being bigger than on the standard 964. More contact area to stop you and they spread the heat better reducing the chance of fade. Now that I've fixed the link you can see that those 'sport' discs just have a few holes compared to standard discs so I personally can't see how they are going to perform better [&:]. They don't even look good IMO which removes one of the other reasons (looks) that people might want to fit drilled discs. Which pads to use is also a personal thing. For me I don't believe you can beat original pads for everyday use. And as most of us know the original pads are made by Textar to you can buy them for about £50 per axle from most of the normal aftermarket suppliers. For track I put Pagid RS15 greys in because they are much more resilient to the heat generated but they squeal when cold and are four times the price!
 
One of my friends remarked once that he didn't think my brakes were that good, obviously it's the way I use them, so I prepared him for a demo, made said statement, and ( on the continent) coming back from Le Mans, I said I will count to 3 then brake......+100mph, 321 brake, watched him leave the seat, held in by seatbelt and then fall back into seat. How was that I asked, especially as the ABS wasn't engaged, are they ok now............err yes was the shakey reply. Textar pads and Zimmerman disks, nowt wrong with that. Kevin
 
Hi Guys The 964RS disc will fit on the rear but not on the front.. The best option would be for the front the 993tt calipers with 965 3.6 discs, caliper adaptors,master cylinder change,turbo proportioning valve,new pads,etc,rear 993 N/A calipers with 964 rs rear disc. This is what i have fitted but its not cheap.2k+ you could also fit the 928 gts front disc which is not drilled. You cant fit the 993tt rear brakes unless you want to loose the handbrake!!. you could also go with the 993tt front disc but you need a differant offset on the adaptors or use 993 uprights and would still need 993turbo calipers. The problem is as soon as you put on bigger discs you need new calipers etc....££££ I am not aware of a Genuine porsche drilled front disc suitable for the front on a 964 unless you upgrade the calipers or use an aftermarket brand. It really depends on what you want.... Personally I dont track my car so its a bit OTT!!but The stopping power in awsome and they look lovely behind the cup 1 wheels!! Tim Will post a few pics
 
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