Clutch query

[Clarky9506]

Hi, quick question. When I put my foot on the clutch I can engage\change gear no problem. If Im at a junction and in gear then the clutch starts to drag after 20-30 seconds. I'm assuming it's either the slave or master cylinders on the way out. Any easy way to tell? The slave was replaced less than 1500 miles ago. Could it be that already?

[Jhonno]

Often if you replace one, the other fails shortly after.. Could be the master. A cheaper option to try first!