2001 ABS brake booster bleeding

[Sylvia]

2001 4Runner SR5, Master Brake (booster) cylinder bleeding. As you know this vehicle has a high pressor pump and accumulator to run the ABS system and assist in the braking process. This system is unlike other vacuum assist systems that toyota uses. I replaced the master cylinder with a new one as well as replacing slave cylinders in the rear wheels. (I inspected the fronts and all is good). I bled the system following Toyota's protocol in the shop manual. Using the hand held tester and isolating each wheel the bleeding process was carried out. The result is a spongy pedal. No matter how much brake fluid I pump through the system I end up with the same spongy pedal. It seems that air is trapped some where in the system. So my question is two parts, Toyota gives one the choice to use the hand held tester or a "ABS Actuator checker". I used the hand held tester but is the "ABS Actuator checker" more effective in isolating the various valves in the booster? (2) Is there any other component that I have over looked that can contribute to my spongy pedal issue. The system holds pressure fine, the pump take about 10 seconds to fill and shuts off, all with in specs.
Any Ideas....?
Thanks

 

[zonianbrat]

2001 4Runner SR5, Master Brake (booster) cylinder bleeding. As you know this vehicle has a high pressor pump and accumulator to run the ABS system and assist in the braking process. This system is unlike other vacuum assist systems that toyota uses. I replaced the master cylinder with a new one as well as replacing slave cylinders in the rear wheels. (I inspected the fronts and all is good). I bled the system following Toyota's protocol in the shop manual. Using the hand held tester and isolating each wheel the bleeding process was carried out. The result is a spongy pedal. No matter how much brake fluid I pump through the system I end up with the same spongy pedal. It seems that air is trapped some where in the system. So my question is two parts, Toyota gives one the choice to use the hand held tester or a "ABS Actuator checker". I used the hand held tester but is the "ABS Actuator checker" more effective in isolating the various valves in the booster? (2) Is there any other component that I have over looked that can contribute to my spongy pedal issue. The system holds pressure fine, the pump take about 10 seconds to fill and shuts off, all with in specs.
Any Ideas....?
Thanks

Not sure is your vehicle has the same system as my 2004 does but I had to have my entire assembly replaced and I was told that the system needs to be hooked up to a computer with the right program to bleed each solenoid individually and in a certain order. Hope this helps.