how can i stop abs activating even at normal braking?

It depends on how handy you are.
It is probably either a loose,poorly fitted, dirty or failing ABS sensor, or a cracked, dirty or rusted reluctor ring.
I would remove each wheel and check visually (sometimes the fault is obvious) and clean the ring with a brush or a good blast with compressed air.
Or (if you happen to have one lying about!) connect an oscilloscope to each sensor, spin the wheel at a constant speed and look for a spike/dip.
If there is nothing obvious it would be best to get it plugged in to diagnostics, there is no point fitting new parts at random.
Make sure you explain clearly to the garage what the problem is.
A basic code reader will not be enough as the car will NOT register this as a fault, therefore there will be no code to read.
You need proper diagnostics with "live data" and a technician who knows how to use it. Plug it in, drive the car, use the brakes and the diag. should tell you which of the ABS circuits is being activated.

bored at work
August 2009