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Originally Posted by Cman
Also with the portioning valve, isn't it setup on the park avenue as a combination valve (proportion/metering) valve with the master cylinder?
If this is the case does that means that I need to change the master cylinder.
I also need to change out the ABS pump it doesn't work. Used a Tech 2 at school awhile ago and there was a short in the LF solenoid circuit.
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The portioning valve is not part of the MC. You may be thinking about the Electronic Brake Control Module (ECBM) or modulator. The ECBM monitors the speed of each wheel and the electrical status of the hydraulic modulator. The function of the ECBM is to detect wheel locking and control the brake system while in the antilock mode and to monitor the system for proper electrical operation. In addition, the ECBM controls the display of ABS faults while in the diagnostic mode.
There is a separate hydraulic line from the modulator to each rear wheel, as well as an individual rear brake circuit proportioning valves. The ABS system can decrease or hold hyd pressure to the rear brakes; however, it cannot increase hyd pressure above the amount transmitted by the MC. Under normal braking conditions, the ABS functions exactly like a conventional vacuum boost brake system. If you have a DTC in your ABS system, it might be better to pull the fuse to disable the system, until the problem is corrected. The ECBM & hyd modulator are not normal serviceable parts, they must be replaced as a unit!
