October 16, 2014
The listed Aisin AW, VW/Audi and Mini transmissions each utilize three spool valves as relay, control or switch valves. These valves are found in multiple circuits in all valve bodies across this family of units (see Figures 1-4) and are used to route critical clutch/brake feed and apply oil to the appropriate apply components. The numerous shift/drivability complaints vary depending on the circuit affected. Sonnax oversized three-spool relay/control/switch valve kit 15741-50K restores proper clutch/brake feed and apply pressure to the related components by functioning in a refurbished bore that provides correct hydraulic clearances.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
NOTE: The vacuum test for the B1/C3 Relay Port in TF-81SC application is an example of a typical port location. All the other valves should be checked similarly at the port associated with the plug-to-valve spool interface.