We need to clarify some points here:
1. Hybrid 94/95 PCM'* mean nothing here. The ABS/TC don't report codes to the PCM. They must be read by a special serial reader. The dealer has the reader. It'll be a minimum of $80 just to diagnose. From 1992-1995 there was no communication between the EBCM(92/93) or the EBCTM(94/95) and the PCM. None whatsoever.
2. I have yet to see a single EBCM or EBTCM fail. Good thing, they're very expensive.
3. Not only can your master brake reservior cause these systems to dump, but there'* also an additional reservior on the PMV assembly that has a level sensor built into it. This is fed from the master reservior. Follow the line down to it.
4. Wheel speed sensors are common culprits, but so is the PMV assembly. That'* not a fun job. There are small solonoids in the PMV that are prone to failure in older cars. PMV'* can run near $1000 installed by a dealer. Cheaper if you do the work yourself. Last time I checked, they were $600 new and $250 from the wrecker.
5. Sometimes a damaged wire or corroded connector at a WSS will be your problem. It'* best to start there and inspect all 4 corners, remove, clean, and reinstall each connector.
6. To replace the WSS, you must replace the entire hub/bearing assembly. In 90% of the cases, these problems are either one or more WSS, or the PMV assembly. The good news is that normal braking will be unaffected. These are fail-safe systems.
7. The biggest problem is lack of use. If a WSS fails, and you don't repair it, the lack of use can cause corrosion in the PMV over time, wiping out your solonoids. These little valves are what meters the brake fluid to each corner as needed.
(I know my ABS/TC systems