Cadillac 92 seville STS. How do I replace the computer. on 1992 Cadillac Seville STS

It is having major electrical problems. The entire dash shuts off going down the road. this is not only problem. I also need to know why my brakes do not work. I replaced all brake lines. they blew out. I bled all calipers several times. still only have one brake. should i change out master cylinder.

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