 | Home > Maintenance & Modifications > Vented discs - Drilled or not ? |
 
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| kenzle8a Member Since: 12 Feb 2020 Location: None Posts: 1074  
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Drilled discs are more prone to crack, esp on the cheaper ones.
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29th Apr 2022 10:27am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5842  
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I don't need that in my life! 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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29th Apr 2022 10:34am |
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| kenzle8a Member Since: 12 Feb 2020 Location: None Posts: 1074
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Grooved keep the pads a bit cleaner, but also wear them faster.
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29th Apr 2022 10:48am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5842
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Cheers 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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29th Apr 2022 11:07am |
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| The Zee Member Since: 26 May 2019 Location: Salisbury Posts: 289 
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Having run cars with Drilled/Dimpled/Groved or a cobination of these;
The groves allow hot gas generated by the pad when braking to escape from the pad/disc interface, additionaly the groves "smooth/shave" the pad preventing uneven wear on the disc at cost of the pad life. They also allow rust, mud or debris an escape path from the face of the disc when trapped between pad and disc. The idea of the cross-drilling is to allow cooling of the disc, allowing "airflow" - supposed. The issue is that the holes create stress points on the disc, the heating cooling cycles of braking cause cracks to propergrate from these holes, this can happen on either face of the disc. I know from experience 
As a result dimples were a replacement due to the dish at the bottom of the dimple the stress is less due the hole not going all the way through the disc, the dimple provides surface area for cooling and "looks cool" (not my opinion!) Often you can't get groves without the dimnples - but I do know that EBC do discs with groves but no holes or dimples. Zaid-M www.DefencePhotos.com 2014 Defender 110 Utility, 2.2 Puma, Indus Silver Not just transport more like a religion |
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29th Apr 2022 5:24pm |
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| jfh Member Since: 08 Jan 2014 Location: West Coast Posts: 357  
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It's a Defender not a Ferrari!
Go plain ventilated. |
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29th Apr 2022 6:50pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1982
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Well unles you have a 705hp LS3 supercharged conversion
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29th Apr 2022 7:29pm |
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| Mo Murphy Member Since: 01 Jun 2008 Location: Letchworth Garden City, Herts Posts: 2217 
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The drillings soon fill up with mud anyway and are rendered useless.
Mo The Land Rover 90 - Many are called, few are chosen. 50 Shades of Pennine Grey |
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29th Apr 2022 7:58pm |
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| Procta Member Since: 03 Dec 2016 Location: Sunderland Posts: 5150
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I stopped buying fancy discs like these, for a couple of reasons, The drilled ones i fitted, one ended up cracking, those were not cheap either. The grooved discs i found no difference in performance over the standard discs. So i just stayed with standard discs from now on. Good quality ones mind, don't go for the cheap stuff, i was bumped the last time with discs, and which gave the car an MOT failure, one had cracked on the rear! Defender TD5 90 ---/--- Peugeot 306 HDI hatch back Success is 90% Inspiration and 4 minutes Preparation # you can make it! |
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29th Apr 2022 11:48pm |
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| I Like Old Skool Member Since: 23 Feb 2015 Location: Manchester Posts: 808 
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Fitted these to my 110 a couple of years ago and no problems since.
www.paddockspares.com/ftc902ap-brake-disc-...kheed.html £62/pair including delivery and a known brand Delphi/AP Lockheed. I wouldn't go cheaper or gimmicky 'performance' parts on such a safety critical part. |
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30th Apr 2022 9:26am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5842
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Cheers all.
I did look at the those Delpi discs and thats probably what I will end up with. Keep it simple! 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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1st May 2022 5:13pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Standard Drilled Dimpled Grooved
Had them all on Miffy over the years. The thinking was since she is a bit of a heavy-weight that upping the "performance" of the brakes would be a good idea. Made me feel better at the time. However, in my experience what makes the biggest difference to braking is keeping the braking equipment in "tip-top" condition; calipers, fluid, servo the works. Without these at optimal efficiency the addition of performance discs and pads will make some but limited difference. On the discs themselves;
Having just replaced the Servo, MC, four calipers, pads, lines and fluid (discs remain the same) on Miffy the difference in braking is akin to jumping from a Series 3 in to a Freelander 2... Immense improvement in braking and lending weight to the braking equipment being of more importance than performance discs. As an aside... It is also noticeable that when I had the Discovery transfer box fitted the brakes wore much quicker than when the standard Defender transfer box is fitted. Obviously, the slowing down is being transferred from the brakes to the gears, whether that is better or worse only time will tell. Back to the thread topic. Would I buy performance discs again... Probably not. But with one caveat... As with the rear discs on Miffy the drilled and grooved were cheaper than the Delphi standard alternatives so those were fitted. Possibly a risk but after many many years they are holding up well. Health of the hydraulic and vacuum system is key, not the appearance of performance. |
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4th May 2022 9:32am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5842
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I can feel a difference after new pads all round and new front calipers along with a bleed of the front brakes.
Before I swapped the front calipers, it felt like one side grabbed first but now its even. I put this down to the old pistons sticking a bit. Maybe new rear calipers will be on the list in the future, but first new new discs up front and will stick with standard discs Assuming the calipers are the originals, then they have done 237k (at least 100k with me) and same with the front discs (at least 100k with me) 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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4th May 2022 9:44am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Quite John... there are not many vehicles that can put +100k miles on a set of discs and +200k miles on calipers with only a minor reduction in performance.
There is no doubt in my mind that new rear calipers will help. Whilst you are changing the front discs remember to order new hub lock nuts and hub seals and think about whether your bearings should be replaced as well. If they have done +200k miles then I would say do them whilst you are in there. If you are not replacing the bearings then a clean and repacking with grease would be a good idea. This job is easily DIYable with minimal tools. A large vice is handy, but not essential. A long breaker bar, 12 point sockets, lump hammer, knocker-outerer (a means by which to tap out the bearing races if you are changing them) and thread lock are essential. Remember when done you will need to bed in the pads and discs  |
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4th May 2022 10:08am |
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