Volvo 480 Club Europe

Need some help with intermittent ABS warning. It often starts with rattling pedal when braking, (mostly after driving several kilometers) then the ABS warning lights up.
The brakes doesn't feel any different and works just as good as before. Doesnt happen everytime I'm driving..

Grateful for help solving this problem!

Suggest using the diagnostic box and then posting up the results if you do not understand.

Mine is a 1990. Doesn't have that litte box in the engine compartment..

It mostly occur at very low speed when braking very lightly.. Anyone?

If only ABS light goes on it sounds like electrical problem. If you break gently and you feel ABS working on the pedal anyway, clean calipers and hub. Check connections in the ABS plugs in the trunk.