In the service manual running the ABS pumps and switches is covered by using the tech-1.
Its a pretty common thing that the Abs Has to cycle before you can get fluid at the back portion. I can cycle the abs without driving the car at 4 mph on jack stands. Other people have done this..
It is true that on a 92, you can enable the ABS pump and the solenoids using a TECH1 or a Mastertech with appropriate software. Typically, energizing specific parts of the modulator valve are done for testing and diagnostic purposes.
However, you do not
bleed the rear brakes with a scan tester because enabling the ABS pump does not pressurize the entire system. Also, running the ABS pump long enough to facilitate bleeding the brakes may shorten the life of the pump. Normally, the pump only runs intermittantly for short periods of time during ABS incidents.
It is NOT common that you have to cycle the ABS before you can get fluid to the rear brakes, in fact, if doing that is required, there may be a problem with the modulator or the base brakes.
What is common is having to bleed the master cylinder prime pipe prior to bleeding rest of the system. The prime pipe is bled with the bleeder on the side of the modulator valve. Then, bled the master cylinder followed by the rest of the system in the following sequence RR-LR-RF-LF.
Pressure bleeding is recommended but manual (ie: someone pushing on the brake while someone else bleeds) is acceptable in some cases. Detailed instruction on proper bleeding, both manual and pressure, is in the Factory Service Manual for MY92.
Lastly, for those who are members of the ZR-1 Net/Registry, that organization's magazine "The Heart of the Best" published a two-part series on 90-95 ZR-1 brake service. Part 2 is in the latest issue which just went to members and Part 1 was in last month's issue.
