on a 1987 420 sel i am getting activation of antilock system at slow speeds such as slowing down for stop signs with no slippery conditions to activate system have tried front and rear sensors another control brain and even substituded hydralic antilock system with relay same results Work correctly in slippery conditions do not have light on dash Help me pleaseThis is annoying [align=right][/align]

 

you need to bring it to a garage who would know how to do preventive maintenance on the ABS valve. unless your capable of then you may be able to do it in your garage with PROPER SAFETY GUIDANCE AND PROCEEDURE. BRAKES AND ITS SYSTEM ARE ALWAYS MY TOP PRIORITY. Let me know if your ready for it and I will guide you thru its very long and need medium skill.