[Laupe]

Hello

Last year i bought a used 2020 Orbea Oiz M-ltd, with Sram Level ULT brakes, and i noticed that the brake pads is not worn 1-2mm at the top:

I thought that it probably had the wrong pads, so i changed them to new ones (which orbea confirmed is correct), but the same problem happened again.

So, i contacted the Orbea dealer where the bike was bought and they said that it's normal for pads to not wear at the top, and that it happens more often with worn brake rotors.

So i bought new Shimano RT-MT800 rotors and test fitted them, same problem, so i took them off.

If the problem was only at the back brake, it could have been a manufactering defect with the frame, but it happens at the front too, wich is a Fox factory 32 SC with the corect spacer.

Any suggestions ?

More pictures:

 

[ljsmith]

Assuming you have always used SRAM rotors, what you are experiencing is not normal, at least in my experience. I have seen this when using a rotor of a different brand than the caliper. I would take a look at that front adapter, it sure looks weird.

 

[Laupe]

Assuming you have always used SRAM rotors, what you are experiencing is not normal, at least in my experience. I have seen this when using a rotor of a different brand than the caliper. I would take a look at that front adapter, it sure looks weird.

Yes, i havle only used the Sram rotor. I just dobble checked the adapter, it sits the right way

 

[Amt0571]

My Canyon has the same issue on the rear brake. Happens with different rotors.

That's caused by a mount that is out of the required tolerances. The bike industry is pure crap, full of brands that sell worse than China quality at aerospace prices.

Since my frame was already replaced for other issues, I don't want to send it again and I'm just going to file the posts. My frame is aluminium though. Yours is carbon, so that doesn't seem like a good idea.

In any case, it's not normal and can be dangerous as pads could make contact between themselves before biting the disc.

 

[Joe Handlebar]

Is your front adapter upside down? That would cantilever the top of the caliper away from the fork.

 

[Arm&Hammer]

Is the front adapter SRAM?

 

[Sparticus]

This is indeed strange.
I've suffered a similar situation before but it was a long time ago, when disc brakes on bikes were a relatively new thing. I'm surprised to see such out of tolerance parts in 2022. Makes me wonder if something else is going on in your case, tho I can't imagine what it is. Your photos look fine.
Anyway back then a knowledgeable riding buddy informed me that if I didn't fix it, then the unworn portion of the pads (at the top) could contact one another, keeping the remainder of the pad from clamping the rotor, so I should fix it for the sake of safety.
I did so by filing the brake mount down, effectively lowering the caliper. I did this incrementally and quit filing as soon as the outer perimeter of the rotor swept the entire pad.
I said I filed it but actually I used a belt sander, making sure the table of the sander was 90° to the belt. This worked fine.
=sParty

 

[6thElement]

My wife has the exact same problem, but on her Colnago road bike on the front and rear with SRAM AXS Force brakes. There isn't even a an adapter fitted for the rear brake and it still does it.

I can't work it out and haven't had time to take it to a Colnago dealer to get their thoughts.

Very frustrating and dangerous.

 

[FJSnoozer]

My wife Sworks enduro does the same thing with the Code RSC.

The brake mounts need to be decked, but I haven’t done it yet.


Sent from my iPhone using Tapatalk

 

[J.B. Weld]

Best fix would be to use a brake mount facing tool to mill them down, that way not only would you get the pads in the right position but also the caliper would mount perfectly square and perpendicular to the rotor which makes for much easier and better brake adjustments.

They are pricey so probably a shop deal.

 

[Thoreau]

Is the front adapter SRAM?

looks a lot like shimano, but a quick aearch shows sram has some that look the same as well. the only time ive seen this kind of issue is when mixing the two (usually buy a new specialized bike that has sram brakes, swap out rotors and brakeset, and bam, rotor bottoms out in caliper because the sram adapter isnt big enough. swap for shimano adapter and all good.

totally opposite symptom here tho.

 

[Macharza]

Hello

Last year i bought a used 2020 Orbea Oiz M-ltd, with Sram Level ULT brakes, and i noticed that the brake pads is not worn 1-2mm at the top: View attachment 1964843
I thought that it probably had the wrong pads, so i changed them to new ones (which orbea confirmed is correct), but the same problem happened again.

So, i contacted the Orbea dealer where the bike was bought and they said that it's normal for pads to not wear at the top, and that it happens more often with worn brake rotors.

So i bought new Shimano RT-MT800 rotors and test fitted them, same problem, so i took them off.

If the problem was only at the back brake, it could have been a manufactering defect with the frame, but it happens at the front too, wich is a Fox factory 32 SC with the corect spacer.

Any suggestions ?

More pictures:
View attachment 1964844
View attachment 1964845
View attachment 1964846

Looks like it's not a Sram adapter. Change it and your problem might be solved.

 

[remanaz]

His issue is happening on both front and rear so it is not likely to be the adapter.

Is it possible sram changed the size of their pads at some point in time? I mean others in here are reporting about the same issue with sram being the common manufacturer.

 

[Laupe]

Thank you for all of your suggetions.

The adapter looks like a Sram one, compaired to images from google, but i will try to test fit a 160mm rotor (without adapter) at the front and see if it changes anything.

Since the issue is happening at front and rear, i am maybe thinking it could be a production error in the thickness of the caliper mounting point...

 

[remanaz]

Your rear does not have an adapter so are you meaning the posts themselves? While it is possible to be the posts how likely is it that the frame Manu and fox both messed up and then the fork ended up on a messed up frame? I would be leaning towards the calipers themselves as they were likely made on the same tool at close times to one another.

 

[Laupe]

Your rear does not have an adapter so are you meaning the posts themselves? While it is possible to be the posts how likely is it that the frame Manu and fox both messed up and then the fork ended up on a messed up frame? I would be leaning towards the calipers themselves as they were likely made on the same tool at close times to one another.

Sorry, i meant production error in the thickness of the caliper mount

 

[245044]

Get the mount faced. I bought a Park Disc Brake Mount facing tool set ($$) a couple years ago to fix one of my bikes that had this issue. Worked great. I have faced almost every bike I own to get the mounts perfectly aligned.

 

[Laupe]

Hope some of you can responde to this:
I tried the solution as seen below and it essentially “lowered” the caliper 2mm. So now the pads cover the whole rotor and the problem is “fixed” at the front.
But I have a feeling you are not supposed to run more than 1 “set” of spacers and that the caliper can be unstable, am I right ?

 

[Sparticus]

That may be a 'class B' solution but if it positions the pads correctly, it ought to be fine.
Personally I'd replace that cracked concave washer, tho.
=sParty

 

[J.B. Weld]

Hope some of you can responde to this:
I tried the solution as seen below and it essentially “lowered” the caliper 2mm. So now the pads cover the whole rotor and the problem is “fixed” at the front.
But I have a feeling you are not supposed to run more than 1 “set” of spacers and that the caliper can be unstable, am I right ?
View attachment 1966371

I would much prefer to use the adapter that was on there with the pads slightly high rather than those spacers but you'll probably be fine either way.