996 4S brake vibration issue...

[Robertb]

I DIY'd replacement front brakes and pads on my 4S a couple of years ago, but there is a small vibration under braking, almost as if there is a 'grippier' bit on a disc. Its more noticeable from motorway speeds.

It happened after I put on the first set of discs. I tried to remove what I thought must be deposits with some hard repeated braking but made it much worse so I junked the discs and replaced them. All was well for a while but its come back, albeit not as bad as before.

The discs and pads are Pagid. There is no undue heat from the wheels so I assume the calipers are not binding.

Any ideas if I might be doing something wrong under fitment or anything I can do to improve things? Or is it that the discs/pads are not of good quality... would changing the pads for some EBC Red Stuff help? Or bite the bullet and go Brembo or OE discs...

[jetbox]

I went through a couple of sets of discs on my 996 before I changed the wheel bearings which fixed it…..

[Robertb]

Thanks... were there any other clues to the hub bearings failing?

[jetbox]

None other than the vibration under braking. I had changed everything lse and it was the last thing left. No play in th bearing with the car jacked up either but when the bearing was removed the outer race was very pitted.

New bearings and vibration gone…..

Good luck