722.9 Banner Rebuild Kit, new and ready to install. Fits the 722.9. Ships fast from the USA.
If your Mercedes with the seven-speed 722.9 automatic drops into neutral as it should be shifting into third, flares on certain upshifts, or came apart on the bench with a piston seal torn away from its metal carrier, this is the part that rebuild needs. Although it is filed under our banner kits, this listing is a new 722.9 clutch piston kit: a set of bonded (molded-rubber) apply pistons, packaged as kit ATPK35MF1. It does not include friction plates, gaskets or a filter, so pair it with the soft parts your teardown calls for.
The 722.9, sold as 7G-Tronic, makes seven forward gears from three rotating clutches (K1, K2, K3) and four brakes (B1, B2, BR, B3) acting on its planetary sets. Each of those is applied by a piston: the valve body sends regulated oil behind it, and the piston squeezes the friction and steel plates together. On a bonded piston the sealing lip is molded directly onto a steel ring, so there is no separate seal to replace. When that rubber hardens, cracks or peels away from the steel, oil escapes past it, the clutch is under-applied, and it slips and burns. Because you cannot reseal a molded piston, the fix is a new one.
A slipping 722.9 is not always a piston. ATRA's Gears magazine notes that leaking solenoid O-rings in the valve body are a frequent root cause, since a solenoid that bleeds off pressure starves its clutch the same way a torn piston does. Mercedes diagnostic bulletin LI27.00-P-051451 also tells technicians to read out the control unit's stored data before resetting adaptations, so do a full scan first and note which gear changes the module flags. If the complaint is neutral going into third, or the pan shows friction material, the unit is coming apart anyway, and inspecting every piston is part of that job. Our 722.9 rebuild cost guide walks through what drives the price of that repair and when a reseal is enough.
The kit is listed for the Mercedes-Benz 722.9 seven-speed in 2004-2010 applications, rear-drive and 4MATIC, including the C230, C280, C300 and C350; CLK350, CLK500 and CLK550; E320 diesel, E350, E500 and E550; CLS500 and CLS550; S430, S500 and S550; CL500 and CL550; SL500 and SL550; SLK280, SLK300, SLK350 and SLK55 AMG; ML320 diesel, ML350, ML500 and ML550; GL320 diesel, GL450 and GL550; R320 diesel, R350 and R500; G500; and the 63 AMG models of that period. The 722.9 changed during production and later 7G-Tronic Plus units differ in places, so lay your old pistons beside the new ones and compare diameter and lip profile before you assemble anything. Read the full 722.9 number from the case label (our 722.9 identification guide shows where), or send us your year and VIN to confirm. More parts for this unit are on the 722.6 and 722.9 collection page.
If you need frictions and seals as well, the 722.9 banner rebuild kit for 4MATIC units bundles those soft parts with pistons in one box.
| Fits | 722.9 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A set of new bonded clutch pistons for the 722.9, packaged as kit ATPK35MF1 as pictured. It does not include friction plates, steels, gaskets, seals or a filter.
Gears magazine reports the molded piston in the K1 drum is the most common failure, and the usual result is the transmission falling into neutral when it should shift into third.
The kit is listed for both rear-drive and 4MATIC 722.9 applications from 2004 to 2010. Compare the new pistons with your old ones before assembly, or send us your year and VIN to check first.
No. On a bonded piston the sealing lip is molded onto the steel, so once the rubber is hard, cracked or separating, the whole piston is replaced.
Use a Mercedes-approved 722.9 fluid, MB 236.14 or 236.15 depending on what your transmission's service data calls for, and do not mix fluids. Check the level at the specified temperature.
Yes. Reset the transmission adaptations with a scan tool that supports the 722.9, then drive the car so the control unit can relearn the new clutch fill times.
