Welcome to 2CaroPros.
If could be several things that would cause it not to work. Does it light up to indicated it is turned on? Also, which switches were replaced? Next, do you know what the diagnostic trouble codes were retrieved when the initial testing was done?
There are switches, servo, even a faulty brake light switch can cause it to fail or an ABS module. Let me know what information you have and I'll try to help. As far as the testing, in most cases, everything can be tested. If the PCM is the issue, yes, it too could have been checked.
Let me know what info you have.
Take care,
Joe
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Monday, March 18th, 2019 AT 5:30 PM