Front Brake Jammed

EViS

I haven't used my Cube Ltd Race in some 6 months and upon taking it out of the shed today, I've found that the front brake (Formula ORO K18) is jammed tight preventing the wheel from turning.

Now, due to space restrictions, we do store all of our bikes upright (rear wheel on the ground, front wheel pointing upwards), could this have caused the issue somehow?

Is the only solution to bleed the entire front lines?

Chunkers1980

Have you tried reseting the pistons?

cooldad

Bleeding is for removing air from the system, nothing else.
Remove wheel, lever the pistons in, then pump the lever.

The Rookie

Unless they have been overfilled (if there is insufficient expansion volume the current temperatures may be too much for it especially in a shed which can get very very hot!) in which case the fluid level will need correcting which means essentially following the bleed procedure (correctly!)

EViS

I went ahead and bled the lines, all is well again now. No amount of calliper levelling/pumping freed the stuck disc from the pads. Very odd as the system was bled before last summer and I didn't experience any problems.

YeehaaMcgee

The Beginner wrote:

Unless they have been overfilled (if there is insufficient expansion volume the current temperatures may be too much for it especially in a shed which can get very very hot!) in which case the fluid level will need correcting which means essentially following the bleed procedure (correctly!)

Nope. Brake fluid by design, is meant to specifically NOT change volume (or realistically, change volume only very very slightly) with temperature.
And if you live somewhere that's warmer than a braking system when it's working, you'd be dead. Or on another planet somewhere. Even Death Valley was only about 53 degrees C t'other day.

My money is on a slightly over-filled system. Possibly coupled with a poor bleed.

The Rookie

Overfilling IS a poor bleed as it's effectively the same procedure for filling and bleeding.

Brake fluid does expand....even more so for mineral than DOT.

YeehaaMcgee

By poor bleed, I mean contaminated.

kg211

My front brake, a Clarke skeletal is doing the same, it is ok in the morning but come lunchtime it is rubbing quite well with both piston. It first did this after standing in the garden for an afternoon whilst I worked in the garage.