Z o o !! Posted May 11, 2008 Report Share Posted May 11, 2008 (edited) I finally got my hands on some Heatsink cnc red magura pads, i was so excited to get these pads on after hearing all the good reveiws about them, i put them on and i was off out riding for the day, all day these pads were amazing!, bitey as hell, as much lock and hold as you need. Coming towards the end of the day and i was setting up for a sidehop, pull the front wheel up, pull the brake and the usual noise from tjhe pads, all of a sudden the bike whipped from underneath me and found my self flat on my arse. After looking around the brake area there was no pad in one side, we later discovered that this ahd happened :Now put some koxx brown material in my cnc backs, Edited May 11, 2008 by OnzaTrials23 Quote Link to comment Share on other sites More sharing options...
Shaun H Posted May 11, 2008 Report Share Posted May 11, 2008 Bugger, unlucky man. Most people get away with using them as Steve seems to have come upon some good dimensions for the backings, unlike the ill-fated RimJam backings which destroyed lots and lots of cyclinders!I'd just buy a new slave and continue using them, probably just a freak incidence (although I'm sure there's a couple more people out there who have done it with HS backings). Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted May 11, 2008 Report Share Posted May 11, 2008 first heatsink one i'v seen do that! unlucky mate... Quote Link to comment Share on other sites More sharing options...
Z o o !! Posted May 11, 2008 Author Report Share Posted May 11, 2008 Haa, so pretty much i was just unlucky, Quote Link to comment Share on other sites More sharing options...
Sam-Addy A3 Posted May 11, 2008 Report Share Posted May 11, 2008 Hi, its been just over 3 weeks since i ordered my heatsink reds and i still havnt't received them.I emailed him about a week ago and i got one of those automatic emails.Does anyone know why they are taking so long?ThanksSam Quote Link to comment Share on other sites More sharing options...
Mark W Posted May 11, 2008 Report Share Posted May 11, 2008 What did the automatic e-mail say? Quote Link to comment Share on other sites More sharing options...
Matthew_Gibson Posted May 11, 2008 Report Share Posted May 11, 2008 Mine just ripped the little prong from the inside of the cylinder. Just put the pad back in and carried on riding!! Quote Link to comment Share on other sites More sharing options...
Rusevelt Posted May 11, 2008 Report Share Posted May 11, 2008 Yeah thats an all too common problem with Heatsinks. what i believe is the cause of that is the kinetic energy stress generated from the pad grabbing the rim sidewall, transmitting through the alu backing to the piston. or the piston generating greater kinetic energy stress via the alu backing over a standard plastic backing. thats the risk you run with heatsinks, greater stopping power means that certain mechanical parts are prone to greater stress. Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted May 11, 2008 Report Share Posted May 11, 2008 kinetic energy stressYou what? Quote Link to comment Share on other sites More sharing options...
Greetings Posted May 11, 2008 Report Share Posted May 11, 2008 I'd say metal fatigue. It's highly unlikely this was caused by the backings being made of aluminum. I'm no expert though so let's see what others have to say about this. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted May 11, 2008 Report Share Posted May 11, 2008 it could be fatigue related...but its hard to tell from the photos.....he has ripped off two of the prongs, which would have taken two seperate cracks..maybe at the corners (tis kinda symmetrical..)wally (mr rimjam) said that his pads made this happen a few times, because the (think it was a zinc alloy) he was using was quite soft, and after a while the backings had deformed enough to give a substantial "wobble" to the pad. Then when the brake was applied, the backings are actually hitting the guide prongs- nice brittle casting + impact...snap. Not a problem on the heatsinks though, because they are made from a harder material that doesn't deform to the same extent during use...clearly something has gone wrong though...! did you have the pads quite far away from the rim?adam Quote Link to comment Share on other sites More sharing options...
Sam-Addy A3 Posted May 11, 2008 Report Share Posted May 11, 2008 What did the automatic e-mail say?Basically, it said: Hi, sorry you had to chase your order. There has been a sudden rush of orders so it may take a bit longer for you to receive your item. Extra sweets will be enclosed for people who have had to wait.That was about 2 weeks ago and i still havn't received them Sam Quote Link to comment Share on other sites More sharing options...
OD404 Posted May 11, 2008 Report Share Posted May 11, 2008 You what?My thoughts exactly. The whole post made no sense to me whatsoever.The broken prongs do look a little like the result of fatigue to me as there seems to be some darker areas on the fracture face which would indicate the presence of a crack prior to the final failure (though could be just shadow). Quote Link to comment Share on other sites More sharing options...
Krisboats Posted May 11, 2008 Report Share Posted May 11, 2008 Yeah thats an all too common problem with Heatsinks. what i believe is the cause of that is the kinetic energy stress generated from the pad grabbing the rim sidewall, transmitting through the alu backing to the piston. or the piston generating greater kinetic energy stress via the alu backing over a standard plastic backing. thats the risk you run with heatsinks, greater stopping power means that certain mechanical parts are prone to greater stress.Is it really? Mine have been fine since i bought them nearly 2 years ago In fact, the only pads i'd heard to do this were rimjams, save a few incidents with old maguras running the heatsink pads (by old i mean used for a long time and due for replacement, not the old style). I'd imagine your magura was pretty old, the build up of crap around where the nipple is shows they're not the newest of things. I'd whack your red material back in if you were getting on with it, and run it with your replacement slave cylinder. I'd be very suprised if it happened twice. Quote Link to comment Share on other sites More sharing options...
Simpson Posted May 11, 2008 Report Share Posted May 11, 2008 kinetic energyWell its not going to be energy in the form of heat now isit?Why change the pad material if the heatsinks were that amazing? Just wack another cyclinder on an doubt it will ever happen again Quote Link to comment Share on other sites More sharing options...
Simpson Posted May 11, 2008 Report Share Posted May 11, 2008 Yea but seriously just get a piston of a mate or something, round here people have bags of old cyclinders hanging around, usually let you nabb one for free!That's the most sarcastic I have ever read anyone to be on forum since I've been on here!Didnt see my vid then? Quote Link to comment Share on other sites More sharing options...
Ryan Blackwell Posted May 11, 2008 Report Share Posted May 11, 2008 Mine snapped the prongs off two, only because i snapped the little pin off and carried on ridding so all the pressure was on the two prongs, was bombing it down a hill and dragged my back brake and it just went booom and the leaver pulled in and found it was gone hahahYea but seriously just get a piston of a mate or something, round here people have bags of old cyclinders hanging around, usually let you nabb one for free!Didnt see my vid then? You legend lmfao thats so funny lmfao hahahahah, i loled so much lol Quote Link to comment Share on other sites More sharing options...
basher Posted May 11, 2008 Report Share Posted May 11, 2008 Haa, so pretty much i was just unlucky,my mate went through about 3 cylinders in the space of a few months when he ran cnc backings. Quote Link to comment Share on other sites More sharing options...
Rusevelt Posted May 12, 2008 Report Share Posted May 12, 2008 Is it really? Mine have been fine since i bought them nearly 2 years ago In fact, the only pads i'd heard to do this were rimjams, save a few incidents with old maguras running the heatsink pads (by old i mean used for a long time and due for replacement, not the old style). I'd imagine your magura was pretty old, the build up of crap around where the nipple is shows they're not the newest of things. I'd whack your red material back in if you were getting on with it, and run it with your replacement slave cylinder. I'd be very suprised if it happened twice.Rimjams are another alu backing pad that generate alot of stress on the pistons because of their powerful bitting power. just depends how you modulate the braking power ie; if you race down a steep hill and then grab the brakes, well then your asking for trouble. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted May 12, 2008 Report Share Posted May 12, 2008 not quite man...that was the problem with the rimjams- the material wasn't good enough! heatsink backings are good quality stuff, hence the price! Quote Link to comment Share on other sites More sharing options...
N.Wood Posted May 12, 2008 Report Share Posted May 12, 2008 Rimjams are another alu backing pad that generate alot of stress on the pistons because of their powerful bitting power. just depends how you modulate the braking power ie; if you race down a steep hill and then grab the brakes, well then your asking for trouble.What difference does having a metal pad backing as opposed to a plastic pad backing have on the 'biting power'?The pad material is exactly the same, hold may be a different story (less flex...) but an increase in bite? Nahhhhhh.... Quote Link to comment Share on other sites More sharing options...
forteh Posted May 12, 2008 Report Share Posted May 12, 2008 Thats been cracked for ages Quote Link to comment Share on other sites More sharing options...
sidehop Posted May 12, 2008 Report Share Posted May 12, 2008 (edited) That piston had a wee crack in it before the pads killed it you know that yeah?I can tell by the dark metal by the snap. Ill show you.Edit.. Edited May 12, 2008 by sidehop Quote Link to comment Share on other sites More sharing options...
Ashley-Wood Posted May 12, 2008 Report Share Posted May 12, 2008 That piston had a wee crack in it before the pads killed it you know that yeah?I can tell by the dark metalCan it not be the spray? Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted May 12, 2008 Report Share Posted May 12, 2008 Can it not be the spray?What spray do you mean? Quote Link to comment Share on other sites More sharing options...
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