when i travel quite fast say like 60mph, and i want to slow down because coming to a roundabout but when i press the brake pedal "hardish" i feel my pedal vibrate, does anyone know why this is, is it because my pads or brake disc is knackering ?

Sounds like the front brake discs are warped to me.

when i travel quite fast say like 60mph, and i want to slow down because coming to a roundabout but when i press the brake pedal "hardish" i feel my pedal vibrate, does anyone know why this is, is it because my pads or brake disc is knackering ?

Possibly ABS, although Ross is right in suggesting brake discs......get the disc run out checked @ a garage

Phil

if it si fizzy and poppy it is the abs. If it is juddeery then it is warped discs.*

*insert disclaimer here