• 1-2 Flare
  • 2-3 Flare
  • 5-6 Flare
  • Flare downshift (K2)
  • Bind-up (K2)
  • Brake distress
  • Excessive clutch overlap (K2)
  • Harsh downshifts (B1)
  • Flare shifts


The K2 clutch control valve provides source pressure for control of clutch (band) apply and release. Responding to TCU and the linear solenoid, the valve establishes control timing of apply and release relative to engine torque. Bore wear causes an overlap or premature exhaust of clutch pressure. Wear at the B1 brake control valve bore affects apply and release rate.


Either circuit can be repaired to restore the intended control oil pressure and eliminate shift complaints, by installing this Sonnax kit.

09D, TR-60SN

K2 Clutch/B1 Brake Control Valve Kit
Part No. 25741-05K

Fits Either of 2 Locations

You need this if... View Instructions Find a Distributor

Aisin AW TR-60SN and VW/Audi 09D transmissions may exhibit flare upshifts and/or downshifts due to wear in the K2 clutch control bore. Release and apply timing issues and pressure control out of range codes are not uncommon to this unit as well. Wear in the B1 brake control circuit may cause harsh downshifts and/or flare upshifts. Drivability issues also may occur with the change of the vehicle operating temperatures. The Sonnax K2 clutch/B1 brake control valve kit 25741-05K re-establishes accurate clutch or brake control oil pressure and eliminates shift complaints associated with either circuit. With the improved materials and valve support, service life can be extended beyond that of the OE casting.

  • Highly wear-resistant sleeve provides additional support to the control valve
  • Hardcoat anodized aluminum valve combats premature wear and has more sealing contact with bore than OE to minimize leakage
  • Spring maintains OE operating pressures
  • Sleeve
  • Valve
  • Spring

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.

Aisin AW TR-60SN Valve Body Layout

Aisin AW TR-60SN Valve Body Layout
  • 09D, TR-60SN K2 Clutch/B1 Brake Control Valve Kit 25741-05K
  • 09D, TR-60SN K2 Clutch/B1 Brake Control Valve Kit 25741-05K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

09D, TR-60SN K2 Clutch/B1 Brake Control Valve Kit Vacuum Test Locations