Vauxhall astra 1.4 sxi 59 plate breaking problem

[tawse69]

Hi all, I am having a problem with my breaks. The ABS light comes on and off but mostly stays on. Sometimes when breaking the engine cuts out & now sometimes it is as if when breaking the breaks are going into skid mode and the breaks are jumping which is stopping the car from breaking. Has anyone else had this problem or does anyone have any idea what it could be?