SteveP Posted October 24, 2006 Share Posted October 24, 2006 I have cross drilled brake discs fitted to the (recently aquired) tintop and have noticed that when braking, as I pass 40mph, I get what can only be described as a loud hum. It disappears as the speed drops, and only occurs at 40mph. It is definitely not a grinding noise i.e. not crud on the discs, there is no vibration through the pedal or the steering wheel and braking performance seems totally fine. Other forums suggest that these sort of discs are prone to humming, (notably on BMW M3s) but to what degree and how loud? Currently it seems a bit excessive to me, but have no experience of other cars with drilled discs. Anybody out there got any experience or can offer advice, before I wheel the car down to the dealers for them to tell me TADTS? Thanks SteveP The Caterham Pages here Link to comment Share on other sites More sharing options...
oldbutnotslow Posted October 24, 2006 Share Posted October 24, 2006 I have x drilled and grooved on my AR spider and get no noise at all when driving along. However, I get significant noise from them under hard braking. Very off putting the first time you stop! Grant Taylor OBNS Motorsport www.obns.co.uk 😬 183 BHP of Black and 'Stone Chip' excitement. 😬 here Link to comment Share on other sites More sharing options...
drB Posted October 24, 2006 Share Posted October 24, 2006 not a direct answer to your question but had some grooved discs on my golf gti fitted with standard pads (Pagid). Grinding noise was absolutely horrible on braking, stripped everything down at least twice convinced that something was rubbing or I had metal on metal somewhere couldn't find anything so just replaced the pads (Pagid Fast Road) and never heard anything again! but as you say, your problem is speed related and not under braking.... Link to comment Share on other sites More sharing options...
SteveP Posted October 24, 2006 Author Share Posted October 24, 2006 No my issue is when under braking, not just driving along and sounds similar to what OBNS describes. I was wondering whether a change in pads might help, as they don't seem to be too effective at slower speeds but come into their own under hard braking and when they get hot. It is almost like they set up some sort of resonance at 40mph when braking, is that possible? SteveP The Caterham Pages here Link to comment Share on other sites More sharing options...
Harry Flatters Posted October 25, 2006 Share Posted October 25, 2006 This may be so much BS but someone much more knowledgeable that I once told me that cross-drilled discs can sometimes be prone to minor gaseous explosions in the holes caused by heat and pad vapour build-up giving rise to vibrations or even 'humming'. Maybe try another pad compound and see if the problem eases. Just a thought, talking of BS and 'humming', you haven't driven thorough any cow sh*t have you 🤔 😬 I'll get my coat.......... *arrowright*Harry Flatters *arrowright* AKA Steve Mell - Surrey AO and Su77on Se7ener Link to comment Share on other sites More sharing options...
nickh7 Posted October 25, 2006 Share Posted October 25, 2006 Whats the tune? Its Yellow and Black and makes me 😬 Link to comment Share on other sites More sharing options...
Ian R Posted October 28, 2006 Share Posted October 28, 2006 I fitted cross drilled discs and M1144 pads on the front last year and they do make a slight noise under braking (a sort of whirring), compared to the plain standard discs. I've never given it a second thought as I knew what it was. Ian (If you want to go faster, you will have to add lightness!) Edited by - Ian R on 28 Oct 2006 21:01:24 Link to comment Share on other sites More sharing options...
Gridgway Posted October 29, 2006 Share Posted October 29, 2006 yep, I have had a thrumming on drilled disks on my scooby and now my TVR. TADTS Graham Link to comment Share on other sites More sharing options...
Harry Flatters Posted October 30, 2006 Share Posted October 30, 2006 "Thrumming" - now there's a great word for an episode of Call My Bluff 😬 *arrowright*Harry Flatters *arrowright* AKA Steve Mell - Surrey AO and Su77on Se7ener Link to comment Share on other sites More sharing options...
Gridgway Posted October 30, 2006 Share Posted October 30, 2006 now that was just a fantastic programme! Link to comment Share on other sites More sharing options...
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