Tool Required VB-FIX Required
- 4-5 Flare
- 4-5 Harsh
- Delayed Forward & Reverse
- Harsh engagement
B2/BR bore wear allows critical pressure breach that prevents normal clutch control.
Recover hydraulic control and renew Forward and Reverse operation by reconditioning the bore and installing Sonnax oversized B2/BR regulator valve kit.
Oversized B2/BR Regulator Valve Kit
The B2 clutch in Mercedes 722.9 transmissions is applied in first through fourth gears, and the BR clutch is used during Reverse operation. The B2/BR regulator valve controls the apply rate for these clutches. Bore wear at the B2/BR regulator valve allows pressure loss that affects clutch apply timing, resulting in harsh engagement, delayed Forward and Reverse, flares, and harsh 4-5 shifts. Reconditioning the bore and installing Sonnax oversized B2/BR regulator valve kit 88740-04K renews critical clearances to restore normal Forward and Reverse operation.
- Hardcoat anodized aluminum valve combats premature wear
- Annular grooves help center valve in bore to reduce future side-load wear
- Lengthened critical spool provides added stability and wear prevention