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Assembling stepped tandem brake master cylinder - AR42.10-P-0315-02A

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TEST VALUES FOR BRAKE MASTER CYLINDER

Number Designation Model 129.05/06 (Teves, Lucas) Model 140.02/03/1 (Teves, Lucas)
BE42.10-P-1001-04A Master brake cylinder dia. Pushrod circuit mm 25.40 25.40
inch 1 1
Floating circuit mm 19.05 19.05
inch 3/4 3/4
BE42.10-P-1002-04A Stroke Master brake cylinder Pushrod circuit mm 17 17
Floating circuit mm 15 15

IMPORTANT Repair kits and housing from different manufacturers can be used as an alternative.

  1. Separate packing sleeves (040) from sleeve (041).
  2. Remove secondary sealing pack and piston for the primary brake circuit from the sleeve (041).
    Fig 1: Identifying Packing Sleeves And Sleeve
    G04685685Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  3. Clamp housing (22) inclined slightly, with the bore downwards.
  4. Coat the bore of the housing (22) slightly with brake fluid.
  5. Insert packing sleeve (040) in the bore and, using a screwdriver, push in the secondary piston (20) as far as the stop.

    NOTES Ensure that when installing the secondary piston (20) the guide slot (arrow) is vertical.

  6. Insert parallel pin and pull out packing sleeve (040).
  7. Clamp tandem master brake cylinder so that the bore points upwards.
  8. Insert secondary sealing pack in the housing (22) and press downwards using a drift.
  9. Hold piston (7), insert stop plate (8) and fit circlip (5).

    NOTES Ensure that the circlip (5) seats correctly in the groove of the housing (22).

    Fig 2: Identifying Secondary Piston
    G04685686Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
    Fig 3: Identifying Groove Of Housing
    G04685687Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  10. Coat the container plug (9) lightly with brake fluid and press into the housing (22).
  11. First insert the brake fluid reservoir (10) into the housing (22) with one pipe socket (22), turn through 180° and then press the second pipe socket into the housing (22).
    Fig 4: Identifying Container Plug, Brake Fluid Reservoir And Housing
    G04685688Courtesy of MERCEDES-BENZ OF NORTH AMERICA.