Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-19-14, 07:07 AM   #1
NoTWHaTiTWaSNT
Junior Member
Thread Starter
 
NoTWHaTiTWaSNT's Avatar
 
Join Date: Jul 2014
Location: Essex, United Kingdom
Bikes: Specialized Ariel
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Brake adjustment fail

Hi Guys,
My brake pads (Tektro Draco) were pinching slightly and so I tried adjusting them using this video as a reference.

How to adjust disc brakes - YouTube

Following the method used in the video did not work for me and then I made a big mistake by removing the brakes pads and pumping the brake handle which pushed one of the Pistons out and oil came leaking out.

I pushed the Piston back in but now the break pads are pinching on the Rotor more than before - The wheel no longer turns freely - There is also no pressure when I pull the break lever.

Can anyone tell me what I need to do / point me to a thread or video so I can remedy this problem.

Thanks in advance
NoTWHaTiTWaSNT is offline   Reply With Quote
Old 07-19-14, 07:17 AM   #2
jimc101
Senior Member
 
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Bikes:
Posts: 4,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Sounds like they need a bleed, you can try the video here https://www.youtube.com/watch?v=LhKKe6av-0U if you don't have a bleed kit, would look at the cost of the kit vs just replacing with a Shimano Deore M615, they can be picked up for about £30 an end, and are some of the best brakes currently out there. With the current cost of them, it's almost cheaper to replace than service now.
jimc101 is offline   Reply With Quote
Old 07-27-14, 07:11 AM   #3
NoTWHaTiTWaSNT
Junior Member
Thread Starter
 
NoTWHaTiTWaSNT's Avatar
 
Join Date: Jul 2014
Location: Essex, United Kingdom
Bikes: Specialized Ariel
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks jimc101, thought that might be the case, can you offer any advice on how to adjust the brake pads so they are not pinching the rotor? It's only one pad that is slightly pinching
NoTWHaTiTWaSNT is offline   Reply With Quote
Old 07-27-14, 06:42 PM   #4
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,401
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 78 Post(s)
Quote:
Originally Posted by NoTWHaTiTWaSNT View Post
Thanks jimc101, thought that might be the case, can you offer any advice on how to adjust the brake pads so they are not pinching the rotor? It's only one pad that is slightly pinching
Hydraulic brakes aren't adjusted as much as they're properly centered. Whether you opt for bleed/fill kit and service this brake, or decide to replace instead, it's important to learn how to mount and center them. Otherwise you'll be servicing or replacing on a regular basis.

BTW- the first and most important lesson is to Never squeeze the lever without a rotor, or keeper in place. People who routinely travel with the wheels off, buy or improvise a spacer to trap between the pads, in case a lever is accidentally squeezed.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 07-27-14, 06:52 PM   #5
speedy25
Senior Member
 
Join Date: Mar 2012
Location: NE oHIo
Bikes: Specialized, Trek, Diamondback, Schwinn, Peugeot
Posts: 540
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
If a hydraulic disk brake is causing DRAG on the disk, its usually because of dirt or corrosion. Disassemble, clean, reassemble and bleed.

Make sure you use the correct fluid!

-SP
speedy25 is offline   Reply With Quote
Old 08-05-14, 06:18 AM   #6
NoTWHaTiTWaSNT
Junior Member
Thread Starter
 
NoTWHaTiTWaSNT's Avatar
 
Join Date: Jul 2014
Location: Essex, United Kingdom
Bikes: Specialized Ariel
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by speedy25 View Post
If a hydraulic disk brake is causing DRAG on the disk, its usually because of dirt or corrosion. Disassemble, clean, reassemble and bleed.

Make sure you use the correct fluid!

-SP
Not down to dirt or corrosion, pads were clean
NoTWHaTiTWaSNT is offline   Reply With Quote
Old 08-05-14, 06:20 AM   #7
NoTWHaTiTWaSNT
Junior Member
Thread Starter
 
NoTWHaTiTWaSNT's Avatar
 
Join Date: Jul 2014
Location: Essex, United Kingdom
Bikes: Specialized Ariel
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by FBinNY View Post
Hydraulic brakes aren't adjusted as much as they're properly centered. Whether you opt for bleed/fill kit and service this brake, or decide to replace instead, it's important to learn how to mount and center them.
Any advice on how that's done?
NoTWHaTiTWaSNT is offline   Reply With Quote
Old 08-05-14, 06:28 AM   #8
jimc101
Senior Member
 
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Bikes:
Posts: 4,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Quote:
Originally Posted by NoTWHaTiTWaSNT View Post
Any advice on how that's done?
loosen the caliper mounting bolts, squeze the brake lever so the brakes is fully on, then tighten the bolts back up with the brake lever squeezed. When the brake lever is release, this should result in the caliper being centered.

This process only works for hydraulic brakes (your Draco are) and assumes that you don't have issues with the pistons sticking, if you do, you need to sort that first.
jimc101 is offline   Reply With Quote
Old 08-06-14, 10:05 AM   #9
speedy25
Senior Member
 
Join Date: Mar 2012
Location: NE oHIo
Bikes: Specialized, Trek, Diamondback, Schwinn, Peugeot
Posts: 540
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by NoTWHaTiTWaSNT View Post
Not down to dirt or corrosion, pads were clean
Just the pads being clean is not a thorough inspection. Dirt, mud, corrosion, brake dust frequently inhibit piston operation. If your piston(s) dont move easily, some cleaning is in order. Just spraying a cleaner wont do the job properly, the caliper should be disassembled.

-SP
speedy25 is offline   Reply With Quote
Old 08-07-14, 02:19 PM   #10
NoTWHaTiTWaSNT
Junior Member
Thread Starter
 
NoTWHaTiTWaSNT's Avatar
 
Join Date: Jul 2014
Location: Essex, United Kingdom
Bikes: Specialized Ariel
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jimc101 View Post
loosen the caliper mounting bolts, squeze the brake lever so the brakes is fully on, then tighten the bolts back up with the brake lever squeezed. When the brake lever is release, this should result in the caliper being centered.

This process only works for hydraulic brakes (your Draco are) and assumes that you don't have issues with the pistons sticking, if you do, you need to sort that first.
Tried the method you suggested as said at the beginning of this thread, this did not remedy the problem

https://www.youtube.com/watch?v=XAUTCZ3gIyU

Thanks for highlighting that it might be a problem with the pistons sticking, Speedy25 also touches on this being a possible cause ....

Quote:
Originally Posted by speedy25 View Post
Just the pads being clean is not a thorough inspection. Dirt, mud, corrosion, brake dust frequently inhibit piston operation. If your piston(s) dont move easily, some cleaning is in order. Just spraying a cleaner wont do the job properly, the caliper should be disassembled.

-SP
... and as the bike was nearly new when I got it the "Pistons sticking" sounds likely.

Still undecided whether to replace with the Shimano Deore M615 as jimc101 suggested or get a bleed kit

Thanks again for the advice guys
NoTWHaTiTWaSNT is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 07:28 PM.