Rear Brake "spongy"

Soldato
Joined
23 Nov 2007
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4,969
Location
Lancashire, UK
Learning about bike maintenance and symptoms continues...

Rear brake in question is a disc, cable operated, Avid BB5.

Front brake is what I would describe as tight and crisp. Runs cleanly when not engaged, then to engage there is a small movement of "slack" before the pad comes into contact, at which point there is a small amount of travel on the lever before I have "full brake" where the disc is well and truly gripped.

On the rear brake, there is quite a lot of movement post-engagement before I cannot move the lever any further. Looking at the assembly, clearances are nice and tight, and the caliper appears externally to move precisely in response to the brake lever. It's just that rather than rapidly gripping the disc it's almost like something is flexing?

Two parts to this question - do I need to pre-emptively do something given that it's the rear brake and it seems to work perfectly, just with a longer pull? Secondly, what is the issue?!

Cheers.
 
Only a couple of years old with minimal mileage to date. I'll try the full stripdown, the furthest I've got in the past is adjusting the pad clearances so I've got plenty of good stuff to go at from everyone's suggestions :)
 
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