I have a C280 w202 (R plate!) went to drive it today and at slow speed, the ABS warning triangle on the dash flashes and the ABS cuts in, with no input from myself! It is just happening on the F/O/S wheel, could this be an ABS sensor fault?

Also trying to find out how tho check the gearbox oil too, no dipstick, apart from the on behind the steering wheel!!

Any help would be appreciated thanks.