How do you fix a vacuum leak?

where is the leak? are you not getting good suction? If your vacuum isn't picking up like it should that is most likely not a leak but clogged filters. The only reason I ask is that I recently took apart my whole vacuum(2 hour process) only to find out that it was a filter that I didn't know about ( of course it was easy to get to but took me taking apart the vacuum to find it). After I cleaned it my vacuum was like new. no more dust in the air and it picked up perfectly.