In addition, the system was used on the “F” series Camaro and Firebird and many Saturn vehicles. The Delco VI ABS system (See Figure 7) is a four-wheel, three-channel system that was used from 1992 until 1999 on a large number of General Motors FWD vehicles. Once the bleed function has been performed, the system should be bled at the wheels using the appropriate sequence.Ĭase Study 2 – Modulator Replacement on a Delco VI – 4-wheel ABS system. Other systems, such as the TEVES VI and some of the import systems, require the use of a dedicated bleed tool to perform a similar process. This function cycles each of the dump valves and then energizes the pump to bleed these hidden areas. For example, the Ford version of the EBC310 requires the “bleed function” to be performed through the NGS scan tool (See Figure 6). The majority of ABS modulators not equipped with bleeders will require cycling of the valves and activation of the pump to bleed out these “hidden” areas. The fluid paths to the dump valve, pump and low pressure accumulator represent a “dead end” and will not bleed without additional steps (Figure 5). The fluid flow during wheel-based bleeding is from the master cylinder through the normally open isolation valve and out to the system. Figure 4 shows the fluid path through the left front wheel channel. The red section represents the areas that will not be effectively bled when performing wheel-based bleeding.
The green section represents the area that can be bled through wheel based bleeding. In terms of bleeding, the HCU (hydraulic Control Unit) can be divided into two parts, as shown in Figure 3.
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