the abs light on dash goes out when i start car as it should

Have the abs system scanned!!!

yes ,take the wheel off and check the connection at the abs sensor if the connection is ok then cycle the key three times the abs light should flash a code look for the light to flash 2 times such as 4times first time and maybe 2 times for second time which would be a code 42 eg once you get the code you can ask a mechanic what the code means if the light comes on and stays on it should have a stored code