Forward Drive Range

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2006 Mazda MPV, 2005 Mazda MPV, 2004 Mazda MPV, 2004 Mazda 6, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Spring force and back pressure of accumulator control valve B (39) are applied to the bottom end of the valve and push the valve upward. Conversely, reduction brake operation pressure (38) flows through the inside of the valve, is applied to the top end of the valve, and pushes the valve downward. The back pressure of accumulator control valve B (39) and reduction brake operation pressure (38) maintain the balance. This causes line pressure (34) to decrease and is applied to the reduction brake.
When reduction brake operation pressure (38) is lower than back pressure of the accumulator control valve B (39), the valve moves upward and opens line pressure (34) oil passage (See figure). This causes the line pressure to flow through oil passage (34) to oil passage (38) and pressurizes reduction brake operation pressure (38). Pressurized reduction brake operation pressure (38) moves the valve downward and closes the oil passage of line pressure (34). This causes reduction brake operation pressure (38) to not depressurize. When reduction brake operation pressure (38) is higher than the back pressure of accumulator control valve (39), the valve moves downward and opens drain port (X) (See figure). This causes reduction brake operation pressure (38) to depressurize. When reduction brake operation pressure (38) is depressurized, the force to push the valve downward decreases, the valve moves upward and drain port (X) closes. This causes the reduction brake operation pressure to not depressurize. Thus, reduction brake operation pressure (38) is adjusted according to the change in the back pressure of accumulator control valve B (39).