Stupid disc brakes are driving me crazy

R3awak3n · #1 02-28-2017, 08:24 AM

You all might know that I was dissing on my TRP spyres and was about to go shimano hydro. I then decided to keep tweeking the spyres and wait till campagnolo releases their hydro version (seriously campy, you are now pissing me off).

Anyways, I was having problems with pull and campy levers but that is solved, I am getting a nice amount of travel, not much mush at all. Pretty happy with that. But now I am getting some bad shudder, only when I am going slow into stopping.

I have pretty much done anything, new pads, new rotor (went 180mm), even put a new caliper because I had one around. Re ajusted and still have this damn shudder. If I squeeze the brake hard it fees like the disc still moves around a tiny little bit. Its like it does not bite properly. I was hopping it would go away once the pads are fully bedded but does not seem like it.

The only thing that seems left to do is to face the mounts but when I first got the bike I did not have this problem and the pads look pretty straight with the rotor. I am out of ideas and it is driving me crazy

ColonelJLloyd · #2 02-28-2017, 08:26 AM

You just made that colker guy's month with this post.

Is the shudder from both front and rear?

colker · #3 02-28-2017, 08:29 AM

Quote:

Originally Posted by ColonelJLloyd

You just made that colker guy's month with this post.

Is the shudder from both front and rear?

I wrote that post. We have an arrangement here.

R3awak3n · #4 02-28-2017, 08:41 AM

Quote:

Originally Posted by ColonelJLloyd

You just made that colker guy's month with this post.

Is the shudder from both front and rear?

lol.

and only the front, the back is totally fine.

Could be lack of stiffness in the blades? they do flex when I brake a bit but this could also be due to the shudder.

stuckinthecity · #5 02-28-2017, 08:50 AM

Have you tried swapping out the rotor adapters?

ColonelJLloyd · #6 02-28-2017, 08:54 AM

Quote:

Originally Posted by R3awak3n

and only the front, the back is totally fine.

Could be lack of stiffness in the blades? they do flex when I brake a bit but this could also be due to the shudder.

Is your fork the gen 1 NFE fork?

I really couldn't offer much advice besides the normal solutions and this isn't your first rodeo so you know how to setup

Quote:

Originally Posted by stuckinthecity

Have you tried swapping out the rotor adapters?

Did he say he is using a rotor adapter?

R3awak3n · #7 02-28-2017, 08:57 AM

I do't have a rotor adapter. Its a 6 bolt icetech rotor.

Its a gen 3 NFE fork, really have not heard any issues from NFE owners.

I am pretty sure my setup is fine, I did nothing different. I also checked and its not my headset.

Davist · #8 02-28-2017, 09:35 AM

I have noticed sometimes when my weight is further forward mine shudder quite a bit, like standing/leaning forward when I stop. I have no idea why, but it did surprise me. Checked everything and when I'm seated it's fine, just shows up once in a while.

Fatty · #9 02-28-2017, 09:37 AM

You might have glazed up or contaminated the rear rotor.
Maybe clean up pads and rotor and rebed them gently back together.

sandyrs · #10 02-28-2017, 09:40 AM

Two more ideas that are probably somewhere between nonsense and counterproductive:

- What tire are you using, and is it very ill-suited to pavement? I've found that preexisting shudder gets worse when you're riding a knobby tire on the road. Sample size of 1 and all that
- Is there play in your front hub? Not really sure what this has to do with shudder but you've tried everything that makes sense already

R3awak3n · #11 02-28-2017, 09:40 AM

Quote:

Originally Posted by Fatty

You might have glazed up or contaminated the rear rotor.
Maybe clean up pads and rotor and rebed them gently back together.

brand new pads. rotor was cleaned up using alcohol so this is very unlikely.

R3awak3n · #12 02-28-2017, 09:41 AM

Quote:

Originally Posted by sandyrs

Two more ideas that are probably somewhere between nonsense and counterproductive:

- What tire are you using, and is it very ill-suited to pavement? I've found that preexisting shudder gets worse when you're riding a knobby tire on the road. Sample size of 1 and all that
- Is there play in your front hub? Not really sure what this has to do with shudder but you've tried everything that makes sense already

will check the hub because I am not sure.

as far as tire, I am using the babyshoe pass.

edit - just checked, no play in the hub :/

Fatty · #13 02-28-2017, 09:47 AM

Quote:

Originally Posted by R3awak3n

brand new pads. rotor was cleaned up using alcohol so this is very unlikely.

How did you break them in? Half the battle with disc set ups, really the last part of the install and easy to get wrong.

Fatty · #14 02-28-2017, 10:18 AM

Good break in video here

https://www.youtube.com/watch?v=TM8iRpWDVdo

RudAwkning · #15 02-28-2017, 10:26 AM

A longshot here, but it worked for me. I was getting some nasty shudder on my bike. Tightened caliper bolts. Checked rotor mounting. Checked for play in hub. Cleaned rotor with Brakleen. Cooked metallic pads over flame. Eventually swapped rotor and pads. Issue persisted.

No perceivable movement in the headset, but decided to snug up the headset bolt anyway. Problem solved.