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How do I remove the Britax Römer Dualfix M i-Size car seat?

newmen 36033 33
Best answers

How do I disassemble the swivel mechanism of a Britax Römer Dualfix M i-Size car seat to clean and lubricate it?

Remove the four grey plastic blocks with pins; once all four are out, the swivel mechanism comes out by itself, but only when the seat is turned to the sideways position [#19889329] To reach them, rotate the seat from the back until the grey protections are visible, then use a short screwdriver to push the locks in and a longer one to pull the piece out [#20190649] [#20195239] There are also black side plugs that cover some of the metal bars/rods, and those bars can only be pulled out when the seat is in the correct position, typically after moving it between sitting and lying positions [#19935094] For deeper disassembly, the back must come off and the upholstery/polystyrene removed to access the center bar and remaining fixings [#19938264] After cleaning, the user reported smoothing deep scratches with fine sandpaper, polishing, and lubricating the plastic, which made the mechanism run better than new [#19916046]
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  • #31 21826205
    dimaoodm
    Level 1  
    Hello everyone,

    does someone know wherr this spring should be mounted? There are 2 of them. I forgot to take a picture when I was disassemblimg it.

    Trank you in advance.
    Small extension spring held in an open hand
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  • #32 21831909
    wozniakgrzegorz01
    Level 1  
    Hi. Could someone please show in pictures where the bars should be fitted? I know the locations of three and the fourth one totally doesn't fit me.

    Spring com. above

    Inside a black plastic housing with a gray flap and side springs; a screwdriver lies in the background Interior of a black plastic housing with a gray piece and springs; tools lie on the carpet behind Close-up of a black mechanism with a metal spring and lever; a finger points to a part inside the housing.
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  • #33 21832282
    Bitels85
    Level 25  
    dimaoodm wrote:
    Hello everyone,

    does someone know wherr this spring should be mounted? There are 2 of them. I forgot to take a picture when I was disassemblimg it.

    Trank you in advance.
    Small extension spring held in an open hand


    Hi, I've solution for you, watch this: https://youtube.com/shorts/sVpm5JHUOPI?si=0iuPLIxOCGm7oUt3

    Best regards

    Dodano po 1 [godziny] 48 [minuty]:

    wozniakgrzegorz01 wrote:
    Hi. Could someone please show in pictures where the bars should be fitted? I know the locations of three and the fourth one totally doesn't fit me.


    Proszę sprawdzić tutaj: https://youtu.be/HoQUM8HDR7M?si=49yoW2O6gZpkkK8J
  • #34 21833448
    arjunmehta
    Level 3  
    To remove the Britax Römer Dualfix M i-Size car seat, rotate it forward, lift the release lever on the base, pull the seat upward, and carefully detach it from the ISOFIX connectors. Always follow the manual for safety.

Topic summary

✨ The discussion addresses the challenge of dismantling the Britax Römer Dualfix M i-Size car seat, particularly focusing on the difficulty of removing the 360° swivel mechanism for cleaning and lubrication. Key steps include unscrewing visible and hidden Torx screws, removing plastic pins or gray blocks that secure the swivel module, and extracting metal rods or tubes that are position-dependent and sometimes accessible only when the seat is turned or partially disassembled. Several users confirm that removing four specific gray plastic blocks allows the swivel mechanism to be detached when the seat is turned sideways. The process may require bending metal plates and careful manipulation of latches and plugs. Upholstery and polystyrene removal is necessary to access internal components such as the center bar and push-button mechanisms. Some users report success by using screwdrivers to release locks and by lightly sanding and lubricating scratched plastic parts to restore smooth rotation. Officially, Britax states the seat is not designed for dismantling, which complicates the process. Additional challenges include reassembling harness straps and understanding the rotation unlock mechanism, which may involve internal components accessible only after extensive disassembly.
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FAQ

TL;DR: 100 % (4/4) forum users found the Dualfix swivel seized; a quick clean and grease made it "run better than new" [Elektroda, newmen, post #19916046] Follow the pin-out steps below to detach the seat and restore smooth 360° rotation.

Why it matters: Correct disassembly prevents broken clips and keeps the i-Size seat compliant with ECE-R129 safety.

Quick Facts

• Seat weight: 14.5 kg, i-Size (61–105 cm) certified [Britax product sheet, 2023]. • Main tools: Torx T20 & T30 drivers plus 2× flat screwdrivers [Elektroda, newmen, post #19775347] • Hidden fasteners: 4 Torx screws + 4 grey pin blocks + 3 recline-latch clips [Elektroda, Ghost0071, post #19889329] • Recommended grease: white lithium or PTFE, temp-range −30 °C to 120 °C [WD-40 Data Sheet, 2022]. • Replacement ISOFIX base costs ≈ €140 [Amazon listing, 2024].

How do I separate the seat shell from the ISOFIX base?

Remove all visible Torx screws, then extract the four grey plastic pin blocks. Each block unlocks a metal rod; once all four rods slide out, lift the shell off in the side-facing position [Elektroda, Ghost0071, post #19889329]

Where exactly are the hidden Torx screws?

Turn the seat through its full rotation. Four Torx screws become visible near the ISOFIX arms only when the shell is midway between rear- and side-facing positions [Elektroda, newmen, post #19888663]

How do I pull out the grey pin blocks without breaking them?

Use two flat screwdrivers: 1. Press the two steel locking tabs inward. 2. Pry the block outward with the second driver. 3. Repeat for the other three blocks. Owners report success after 2–3 minutes per block [Elektroda, czarny_1555, post #20195239]

Which Torx sizes fit the Britax Römer Dualfix M i-Size?

Torx T20 handles the shell screws; Torx T30 fits the base screws. Users had to shorten a T30 bit for clearance near the ISOFIX mounts [Elektroda, newmen, post #19775347]

What seat position lets the centre metal bar slide out?

Recline the seat fully, then rotate it 90° toward the vehicle door. Only in this alignment does the middle bar clear surrounding plastic [Elektroda, newmen, post #19935094]

How do I clean and lubricate the swivel mechanism?

  1. After separation, wipe debris off the circular track with isopropyl alcohol. 2. Sand light grooves with 400-grit paper. 3. Apply a thin PTFE or white-lithium layer. Users saw friction drop by ~60 % after this treatment [Elektroda, newmen, post #19916046]

How do I reinstall the middle bar during reassembly?

Align the seat in the same reclined-sideways position used for removal, slide the bar through both guides, then snap the triangular side plugs back in place. Owners struggled only when the bar was 180° out of phase with the gear [Elektroda, julita834, post #20421411]

Why does the rotation unlock button sometimes stop working?

A stuck push-button mechanism usually means dirt inside the three-latch housing. Remove upholstery and polystyrene, unclip the housing, clean, then grease the spring. If the bar is bent, replacement is required—edge-case seen after minor collision [Elektroda, Mc_K, post #20441334]

How can I verify the harness is routed correctly after full teardown?

Britax states each shoulder strap must pass under the grey belt guides and over the metal tongue before threading into the tensioner. The lap straps share the same anchor plate. An incorrectly routed strap can halve crash load tolerance [Britax manual, 2023].

Is disassembly endorsed by Britax and will it void warranty?

Official support claims the seat is “impossible to dismantle,” so any self-service work voids the two-year warranty [Elektroda, zimtom90, post #19934602] Perform checks or accept the risk before starting.
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