Cailper stick.

[BMW BMXER]

All four stick. Rebuild each or something more serious (proportioning valve, master cylinder?)

Help. It smells and shook to death last night. I reckon my pads are fubared too now.

[iXer]

If money is no issue, a pair of calipers cost no more than 200 USD over here in Europe and I'm thinking of replacing mine if they look out of shape when I remove them this summer for service and fluid change. New brake hoses might be in order too.
If you change your fluid regularly, you won't get this kind of problem too often.. the pistone corrodes and sticks. But the piston rubber seals deteriorates with time no matter what and have to be checked upon on our 10-20 year old cars.

[Jordan]

If all 4 started to stick at the same time I highly doubt the problem lies with your calipers.

Sounds like a faulty master cylinder.

[EVOIIIM3]

How old is the fluid?

You may just have some line restriction.

Fist thing I would do is, try and force all the pistons in, and see how they feel. Then try to FLUSH the whole system.

How does the pedal feel? Is it hard or soft?

Don't mess around with brakes!! If there is any rust or corrosion, get the calipers rebuilt!! It's cheap and worth the money!!!

[BMW BMXER]

Pedal pressure changes. If they are sticking its hard. When they dont stick its normal.

Money is a BIG issue college is raping me.