back brake lever sticking

[sharpee1984]

Hi Guys,

I’m having problems with the back brake on my Hyosung GT125R. I use it everyday for commuting and yesterday, on the way to work, I applied the back brake and the lever stayed down after releasing. This caused me to slow to a near stop on a busy road. The brake lever works the back brake as it should (if I force it up it releases, push it down it grips) but it stays where it stays when pushed down. It doesn’t spring back up like it should. There is a small bit of rust on one of the pivots but they still move freely. I have checked the spring, cleaned it with a brush and lots of WD40 but that looks ok. I have also cleaned the pivots in that area.

Would the problem be within the calliper, hoses or likely to be where the brake lever is?

I have read that it could be a simple clean up inside the calliper. Does this sound right? If it is, does anyone know any step by step guides on doing this that a complete novice can follow with limited tools?

Alternatively, if it is around the lever area, how would I rectify?

Thanks in advance guys
____________________
PRESENT: HONDA CBR600F 2002
Past: Yamaha XJ600N 2001
Past: Hyosung GT125 2008

[Kickstart]

Hi

Most likely the issue is with the pivot for the brake lever. You probably need to take it off, clean it up and grease it.

It is highly unlikely that a sticking caliper would cause a brake lever to stick. It is possible that a sticking master cylinder could cause the lever to stick, but on most bikes the lever only pushes on the piston in the master cylinder without being bolted to it so this wouldn't happen.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[sharpee1984]

Thanks for the quick reply. I figured it wasn’t the calliper as it still works when the lever is pressed, although I was kind of hoping it would be as there are lots of guides to cleaning.

So, for dismantling, cleaning and re-greasing the pivots and that area, is that complicated?
____________________
PRESENT: HONDA CBR600F 2002
Past: Yamaha XJ600N 2001
Past: Hyosung GT125 2008

[Kickstart]

Hi

Normally a hell of a lot easier than cleaning the caliper up. If you are lucky the it is an easy to get at bolt through the brake lever that you can just take out, clean, grease and put back. Sometimes the bolt is on the back of the footrest hanger so you need to take that off to get at it. Sometimes they do strange things like mount the master cylinder on the frame with the lever on the hanger which can make more difficult to get the hanger off.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing