Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Disc brake issue/slanted pad

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Disc brake issue/slanted pad

Old 06-27-22, 09:39 AM
  #1  
tondopx
Newbie
Thread Starter
 
Join Date: Jun 2022
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Disc brake issue/slanted pad

Hello,

I'm looking for tips to solve a baffling issue with hydraulic disk brake that I couldn't google anywhere. Just for sake of completeness, the brakes are SRAM Level TL, fairly new (less than a year, not ridden much and not exposed to extreme elements or a crash), the rotor is straight. Happens only on the rear brake, front brake is OK, both pads there are nicely parallel to the caliper and the rotor.

The problem is that one side (right side in the picture) of the brake pads (red) is somewhat slanted and slightly rubs against the rotor (grey) at all times. The other side looks parallel both to the rotor and to the caliper body.

Things I tried so far:

1/ flip around the pads. The situation looks the same, still the right side is slanted, so I guess the problem isn't with the pads themselves. Something must be pushig the far end of the right side pad towards the rotor.

2/ remove rotor, remove pads, feel around with fingers/tyre lever for any unevenness. Couldnt find anyting. I pumped the brake several times while pads/rotor were removed (only slightly not to pop those pistons out). Tried to push the pistons back using fingers/tyre levers. To no avail.

3/ loosen the brake body mount, squeeze the brake to center it on the rotor, tighten the body to the mount again. No visible change.

Any ideas? Googling didn't yield even a single description of this issue, let alone a solution.

Thanks a lot in advance,

Tony



Bloody hell, the forum engine won't let me upload pictures, so my painstakingly drawn schematic goes out of the window

I hope it is possible to visualise the issue from the description Just adding that the pad is slanted so that the "far" end of the pad, near the rim of the rotor, is further away and the "near" end, closer to hub, is closer to the rotor, to the point of rubbing against it.
tondopx is offline  
Old 06-27-22, 10:12 AM
  #2  
Rolla
Victimless Criminal
 
Rolla's Avatar
 
Join Date: Sep 2020
Posts: 2,518
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1113 Post(s)
Liked 2,701 Times in 1,201 Posts
The manual outlines a Pad Advancement Procedure, a Pad Gap Reset, and Pad Retraction Reset. Might go through the process to see if it helps. There's also info on how to remove/replace the pistons.
Rolla is offline  
Old 06-27-22, 10:19 AM
  #3  
Iride01
MotuekaCascadeChinook
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 11,010

Bikes: Tarmac Disc Comp Di2 - 2020

Mentioned: 42 Post(s)
Tagged: 0 Thread(s)
Quoted: 4446 Post(s)
Liked 2,972 Times in 2,071 Posts
All you have to do is tell us you put them in your gallery. There were 3 others there, but they looked the same to me. So I only posted this.



Get more than 10 post's and maybe a day after the 10th and you'll be bestowed with the super human ability to post your own pic posts. <grin>

Last edited by Iride01; 06-27-22 at 10:24 AM.
Iride01 is online now  
Likes For Iride01:
Old 06-27-22, 12:34 PM
  #4  
Ronwalker
Junior Member
 
Join Date: Jun 2022
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
I was only helped by the exchange on a new one.
Ronwalker is offline  
Old 06-27-22, 02:01 PM
  #5  
tondopx
Newbie
Thread Starter
 
Join Date: Jun 2022
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yeah, that's it, thanks a lot mate. Maybe there could be a message telling new users that attached pictures will be shown after some pre screening. All I got was a block page telling me I can't post links or pics until 10 posts.

Made me wonder if I should spam the forum with 10 posts so that I could receive the special powers
tondopx is offline  
Old 06-27-22, 02:03 PM
  #6  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,265

Bikes: lots

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 1632 Post(s)
Liked 2,403 Times in 1,244 Posts
Should be posted in 'bicycle mechanics' not GD, obviously a mechanical question.
cxwrench is offline  
Likes For cxwrench:
Old 06-27-22, 02:11 PM
  #7  
tondopx
Newbie
Thread Starter
 
Join Date: Jun 2022
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yeah, I saw the manuals already and pretty much did all the steps they suggest. Didnt change anything though.
tondopx is offline  
Old 06-27-22, 03:40 PM
  #8  
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Posts: 12,186

Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Catrike Speed

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 1395 Post(s)
Liked 591 Times in 369 Posts
Originally Posted by tondopx View Post
Made me wonder if I should spam the forum with 10 posts so that I could receive the special powers
That will get you disciplined, too. I think you're allowed 5 posts per day when you're on probation. It's all meant to put the brakes on real spammers.
BlazingPedals is offline  
Likes For BlazingPedals:
Old 06-28-22, 09:02 AM
  #9  
Iride01
MotuekaCascadeChinook
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 11,010

Bikes: Tarmac Disc Comp Di2 - 2020

Mentioned: 42 Post(s)
Tagged: 0 Thread(s)
Quoted: 4446 Post(s)
Liked 2,972 Times in 2,071 Posts
less than a year, not ridden much
If you bought this at a local shop, then I'd take it back and just see what they say about the issue and if they offer to do anything towards fixing it.

However if the pad is worn to the point that it's obviously worn uneven as you show, then at the minimum you need new pads. I can only imagine that the pad didn't slide freely where it is pinned at the top. However perhaps the brake piston was askew in the cylinder from the get go and caused the pad to be worn unevenly.
Iride01 is online now  
Old 06-29-22, 09:37 AM
  #10  
msu2001la
Senior Member
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 2,020
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 950 Post(s)
Liked 918 Times in 531 Posts
I don't know how to solve your brake problem, but that diagram is one of the best illustrations of a problem I've ever seen on this forum. Well done!
msu2001la is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.