FORD FOCUS VACUM LINES IS LETTIN AIR IN HOW CAN I TELL?

You can follow lines and listen. But id take it to a dealer, they have kits tha put pressure into the lines an they can pick up were there is a low compression. I have also used a die that gets pumped round and shows up using the UV light.

Ex Citroen/Vauxhall Tech
February 2009