Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

hydraulic disc brake problem

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.

hydraulic disc brake problem


Old 08-29-05, 08:59 AM
Senior Member
Thread Starter
Join Date: Oct 2004
Location: Boston, Massachusetts, USA
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I noticed on my last ride that my Shimano XT hrydraulic disc brakes seem to have gone soft. By that I mean that I have to pull the lever more to brake, and the brakes seem to be less powerful. I think the two possible causes are either worn brake pads or air or water in the brake lines. I haven't done any maintenance on the brakes since I first set them up over a year ago, but I haven't been riding that much. Any other suggestions before I buy new pads and/or bleed the brakes?
dmw010 is offline  
Reply With Quote
Old 08-29-05, 01:08 PM
Pocorider's Avatar
Join Date: Jul 2005
Location: Port Coquitlam BC
Posts: 101

Bikes: 2005 Norco Bigfoot

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sounds like it needs to be bled, before you buy pads bleed the system, might save you some money.
Pocorider is offline  
Reply With Quote
Old 08-29-05, 06:41 PM
The Red Lantern
Rev.Chuck's Avatar
Join Date: Apr 2003
Location: Raleigh NC
Posts: 5,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
It does not sound like pad wear. The pad clearance is self adjusting. You can use a flash light to look in the slot of the caliper to check pad wear, or just take them out and look at them. If you bleed the system you need to remove them anyway so you don't accidently oil them while bleeding. The Shimanos have a rubber "bladder" in the cap for the MC sometimes there will be a little air trapped in it when the system is new. If the lever gets actuated while the bike is upside down or on its side this air bubble can get drawn into the system. Instant soft braking. Bleeding is pretty easy, with a little squeze bottle and some clear tubing(rc car gas line works). You bleed from the caliper up. Shimano has a clamop on cover with vent hose but you don't need it if you don't mind making a mess..
Rev.Chuck is offline  
Reply With Quote

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