1989 mercedes 560 sel abs light comes on off

My 1989 560 SEL the abs light comes on and the engine idles up to about 1,500 rpm. It stays on for about 60 seconds then goes off. Most of the
time it is when it is raining. I have tried using brake cleaner and it did not help. Any help would appreciated
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.