brakes

[old241]

Hi all fitted new front discs (Brembo) & pads (ferodo) to the willy one nipped it round the block brake pedal goes bang bang bang under foot, like its got abs
not at slow speeds though, took it all apart cleaned everything caliper sliders etc checked pistons move all ok problem still exsists any ideas thanks in advance

[RB23]

Has the disc gone on and sat down squarely?

[old241]

thanks for the quick response, yes checked twice ,claened the hub faces, both discs flat and square as far as I can tell ie no rocking

[Allan]

does sound like warped rotors....

Can you spin the disc freely or does it catch.
Check your calipers are mounted all square too.

[old241]

Thanks warped disc or discs is the answer , refitted old discs all fine so back to GSF for refund/exchange