Jigghead Posted April 20, 2015 Posted April 20, 2015 So I was riding The Cradle MTB Trophy last weekend and made it through the nasty 75km stage on Saturday without much problem. Upon setting the bike up for the Sunday session, I took my bike for a little spin around the car park after taking it off the car and heard a terrible grinding from the rear brakes. I didn't take the wheels off but could see that one of the pads had suddenly worn down to nothing. Went to the "shopping tent" and was told that the guy with the brakes was not there yet. So, I rode with front brakes only in the end as my start time was approaching too fast to wait for the arrival of new brake pads. I swapped them out this weekend and this is what I found... I've only ever used Shimano brakes and have never had this happen. This is the first set of ICE Tech pads tho, they came with the XT brakes. Just a one off manufacturing fault? As you can see, the other pad is not particularly heavily worn.
Cat2forLife Posted April 20, 2015 Posted April 20, 2015 That is kinda weird.. I've been using those Ice Tech pads for around 2 or 3 months now, and mine are still fine. Granted I don't ride an insane amount on my MTB, but I do a fair bit of riding on it.
RocknRolla Posted April 20, 2015 Posted April 20, 2015 Please fix the thread title to Shimano Breaks...
jarek.pski Posted April 20, 2015 Posted April 20, 2015 Was there much mud at the cradle trophy?I found the XTR and XT pads wear very quickly, in terribly muddy conditions During a 24hr race a few years back I managed to write off a new set of XTR's too..
Jigghead Posted April 20, 2015 Author Posted April 20, 2015 Little bit of mud towards the end, but most of it was flat so no braking required. This was not worn through though, the braking surface had separated from the main assembly entirely. I had checked them about two weeks prior to the ride and only rode once in between. The wear was pretty much identical to that of the remaining pad.
JXV Posted April 20, 2015 Posted April 20, 2015 It looks like the friction material on one of the pads delaminated and fell out. With no friction material, next thing that happens is the trailing edge of the return spring gets hooked in by the holes in the disc when you brake....and is likely responsible for some of the horrible noise. Noise also from metal on metal contact between backing plate and disc as shown in your pic. Pads can wear very fast in mud but then they wear more evenly. I think this was a failure. Those finned pads are not really necessary unless you are doung long fast descents or if you are heavy. Just get standard ones - they only have a single backing plate and the material is bonded directly onto this
Headshot Posted April 20, 2015 Posted April 20, 2015 It looks like the friction material on one of the pads delaminated and fell out. With no friction material, next thing that happens is the trailing edge of the return spring gets hooked in by the holes in the disc when you brake....and is likely responsible for some of the horrible noise. Noise also from metal on metal contact between backing plate and disc as shown in your pic. Pads can wear very fast in mud but then they wear more evenly. I think this was a failure. Those finned pads are not really necessary unless you are doung long fast descents or if you are heavy. Just get standard ones - they only have a single backing plate and the material is bonded directly onto thisPlus 1 - and they are much cheaper. Could also relate to caliper set up and maybe a sticky piston - any experts out there? I have also noticed that my rear pads wear unevenly at the back ...
GoLefty!! Posted April 20, 2015 Posted April 20, 2015 definitely those brakes need to be set up and bled properly.
Jigghead Posted April 20, 2015 Author Posted April 20, 2015 Brakes we bled less than two weeks before the ride in question.EDIT: Brakes were bled less than two weeks before the ride in question.
Captain Fastbastard Mayhem Posted April 20, 2015 Posted April 20, 2015 Brakes we bled less than two weeks before the ride in question.plus, that wouldn't have had anything to do with the delamination. Probably just a bad pad. There are some reports on line of various pads becoming delaminated, but nothing huge...
GoLefty!! Posted April 20, 2015 Posted April 20, 2015 Brakes we bled less than two weeks before the ride in question. who is "we"?
GoLefty!! Posted April 20, 2015 Posted April 20, 2015 plus, that wouldn't have had anything to do with the delamination. Probably just a bad pad. There are some reports on line of various pads becoming delaminated, but nothing huge... actually is does. If one piston is lazy and the pad drags it can delaminates due to constant heat load and vibration. Seen many many pads that end up looking like these
Paul Ruinaard Posted April 21, 2015 Posted April 21, 2015 actually is does. If one piston is lazy and the pad drags it can delaminates due to constant heat load and vibration.Seen many many pads that end up looking like theseAlso check whether you are using resin vs sintered. Resin pads build up heat much quicker because they bite harder, but cant dissipate it and so fade quicker. They are also very prone to being ground to paste in 40 km of mud riding. Mud seems to make the compound used in resin pads disintegrate irrespective of whether you are braking. Possibly a faulty batch. Are both pads the same material 9you didnt possibly mix them up). That would cause uneven wear as well. I have ridden Ice tech for years now and am a big boy - with no problems. But you may just have had a faulty batch. Be thankful you didn't have this happen on the first stage of the Epic within 10kms of the start like I did....
Jigghead Posted April 21, 2015 Author Posted April 21, 2015 by the LBS or yourselves? A very reputable LBS. Having said that, it's not rocket science to bleed a set of brakes. I just ran out of time on this one!
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