Kia Optima: Underdrive Brake Control Solenoid Valve(UD/B_VFS). Description and OperationDescription
Underdrive brake control solenoid valve(UD/B_VFS) is attached to the valve body. This variable force solenoid valve directly controls the hydraulic pressure inside the underdrive brake.

Removal
Underdrive Brake Control Solenoid Valve(UD/B_VFS). SpecificationsTire Replacement
If the tire is worn evenly, a tread wear indicator will appear as a solid band
1/2 inch wide (12.7 mm) across the the tread. This shows there is less than 1/16
inch (1.6 mm) of tread left on the t ...
Repair procedures
If the there is lack of power, excessive oil consumption or poor fuel economy,
measure the compression pressure.
1.
W ...
Installation
OCS(Occupant Classification System) is utilizing a robust weight measuring
technology. Thus, if any of the following conditions occur ...