ABS C1963-20 Code and RCM B1212138A Code. What are they?

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I have had a master brake cylinder replaced due to the brakes going to the floor on the first push. If you pushed again they would act normal. My brakes now are becoming mushy. Also my cruise control will shut off every once in a while going staight, no bumps in the road, and you have to push the crusie on button to retart the crusie control. Also the air bag front seat comes on and stays on for no certian amount of time than goes away.