How do you escape the cops in Vegas NFS the run?

[slicepro2]

How do you escape the cops in Vegas NFS the run? Cops have me on the hood and game says escape from the cops and to hit B and then X. Nothing happens when I hit the B key and the X key.

[SenatorP]

Game indicates to spam B.... then hit x.

Repeating that a few times, and then get a 'broken B' icon and back to the hood for another try.

Never indication of what else to press, only b-spam followed by x.

If you do nothing it also gives a 'broken B' and fails after a while.