I decided to fit a set of groved discs to my IS not that i had a problem with the standard brakes.As the discs are large and you can alot off them it would make the car look nice,I fitted the discs and a new set off rear pads.On this forum i see that Mintex pads have a good name,as i worked in the motor trade for some 25yrs i know that Mintex is a well known brand.So on to good old Ebay for some pads,the front pads still had 75% still on them(Lexus pads) so i refitted them.When i drove the car i found that even at slow speed 25mph a hum like noise when brakeing.This got more at speed and at speeds like 80mph it was very bad, i hoped it would go when the pads bedded in but a few hundred miles later still no luck.So i when back on good old Ebay again and £31.00 less in the bank and two days later my new Mintex front pads arrived.I fitted them not expecting mutch but when i drove the car the noise had gone,iv now covered afew hundred miles and so far so good.