Diego,

Don't know if you miss-spoke when you said wheel brake cylinders, but don't you have inboard brakes? There won't be any wheel cylinders.

If you have the normal Unique/Jaguar inboard brakes, check the pistons. If they are rusted, replace them with stainless steel ones. Even a little rust on them will cause them to stick.

They are easy to replace once the calipers are removed from the car. Just use an air compressor/hose on the brake fluid connector to get the pistons out of the calipers. Careful as they will fly out so point them at your work bench when you apply the air.

Jer