Yesterday I hit the brakes hard in my 83.5 waterboxer Westie to avoid an accident.  Thankfully, the accident was avoided and all is well, but now the brakes are spongie - it's even loosing brake pressure at stop lights and sometimes I have to pump the brakes to stop.  Not safe, I know.

Where should I look first - the master cylinder or the individual calipers/cylinders.  It couldn't simply be air bubbles could it?  I bled the brakes in December of 2000.

thanks,

Paul