Inconsistent reaming can result in slightly undersized bore.


The Sonnax bore sizing tool slightly resizes bore ensuring correct bore-to-valve interface.


Associated tool kit 119940-TL4 is no longer in production. Check with your distributor for availability.

01M, 01N, 01P

Bore Sizing Tool
Part No. 119940-BST

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In some VW/Audi 01M, 01N and 01P units, you may find after installing the Sonnax oversized TCC apply valve kit 119940-04K that the TCC apply valve sticks or doesn't drop all the way into the bore without excessive force. Sonnax bore sizing tool 119940-BST resizes the bore and gives you the finish and roundness you need to allow the valve to move freely.

  • ¼-20 Tapped hole for use of slide hammer
  • Allows for successful oversizing of bores
  • 01M, 01N, 01P Bore Sizing Tool 119940-BST