This can be achieved by running a touch command to the file "cache.flush" in the directory specified as ModPagespeedFileCachePath.
Default path is '/var/cache/mod_pagespeed/cache.flush' and be sure Apache's user has write permission on this folder.
== Installation ==
1.- Login to Joomla Admin
2.- Go to Extensions Manager: Extensions > Extension Manager
3.- Upload Package File: Browse to the zip file > Select Upload & Install
== Use ==
4.- Open the component: Components > MPS Flusher
*.- If your cache.flush file has a different path you can use component's options to change it.