Brake problem?

May or may not apply here but I had a 1993 caravan that had the hydraulic unit replaced. Could not get the air out of the system and turned out to be the hydraulic unit holding air because the ABS did not open the valves to let the air out. I did not have the scan tool to cycle the ABS to bleed it either. Neat little trick is to drive the car in a safe place and slam the brakes real hard to try and activate the ABS. This will open the valves and push the air into the rest of the system where you can bleed it out. May have to bleed several times but it worked for me and I got full pressure back after doing this. ABS brakes need to be bled with a scan tool to get it the first time. If you don't have the scan tool, activate the ABS the old fashion way.:-D