brake problem

[dazat5]

Hi all, was driving down the M5 today, had to apply brakes and there was nothing!!!!, tried pumping it and it felt like something was crunching, it was hard to put my foot down, it worked in the end but has happened a few times since, any ideas?

[MrMopp]

Sounds like the ABS is playing up, any lights on the dash ?

[dazat5]

Sounds like the ABS is playing up, any lights on the dash ?

Only the engine management light

[dazat5]

noticed today that this only happens if i put my foot down....