I have a 2006 Hummer H3 and was driving to work half way there i went to step on brake it went straight to floor. I had to pump brake so the brakes would get hard over and over till i got to work. When i parked brakes still went to floor i turned vehicle off checked brake level which was full and went inside. About 2 hours later i had to go home to get my pick up i jumped in hummer and everything worked fine no brake issues or nothing. only happened that one time. And when it did happen a display on dash said abs traction fault. Any ideas i'm thinking about draining brake fluid and putting new fluid in. I dont think the master cylinder is going bad i hope not. Any help would be welcome.

 

abs block electric motor

 

 

Is there an actual part number for that part alone or is it the whole brake valve assembly?