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Carrying out bleeding operation - AR42.10-P-0010-02SX

FRONT AXLE BRAKE CALIPER

Number Designation Model 221 except model 221.074/077/174/ 177/179 Model 221.074/077/174 /177/179
BA42.10-P-1001-10M Bleed screw to brake caliper Nm 14 16
REAR AXLE BRAKE CALIPER

Number Designation Model 216 except 216.374/ 377/379 Model 216.374/ 377/379 Model 221 except model 221.074/ 077/174/ 177/179 Model 221.074/ 077/174/ 177/179
BA42.10-P-1001-12M Bleed screw to brake caliper Nm 14 23 14 23

Opening sequence on 1, 2 or 4 piston brake calipers on front axle 

Fig 1: Opening Sequence On 1, 2 Or 4 Piston Brake Calipers On Front Axle
G07502616Courtesy of MERCEDES-BENZ USA

Opening sequence on 6 or 8 piston brake calipers on front axle 

Fig 2: Opening Sequence On 6 Or 8 Piston Brake Calipers On Front Axle
G07502617Courtesy of MERCEDES-BENZ USA

Opening sequence for model 221 with code (Z07) maximum protection 

Fig 3: Opening Sequence For Model 221 With Code (Z07) Maximum Protection
G07502618Courtesy of MERCEDES-BENZ USA
  1. Set bleeding pressure on filling and bleeding unit to 2 bar.
  2. Remove caps (10) for bleed screws (1, 2, 3, 4, 5, 6) on brake calipers.
  3. Fit bleed wrench (03) and bleed hose (02) on bleed screw (1).
  4. Open bleed screw (1).
  1. 5.1 Bleed the hydraulic system of the brake system (after the hydraulic system was opened for repair): Fully depress brake pedal repeatedly, until new bubble-free brake fluid flows out at the bleed screw (1).

    NOTES To bleeding the brake system correctly it is absolutely essential to pump the brake pedal throughout the entire bleeding process. Otherwise brake system malfunctions and a failure of the brake system can occur due to remaining residual air.

    NOTES In order to avoid the intake of air, do not pump the brake pedal in a jerking manner, but gradually release. The bleed screw (1) can remain open during the entire pumping process.

    Required total quantity of brake fluid: approx. 1.5 l.

  2. 5.2 Replace brake fluid (service 4, hydraulic system of brake system was not previously opened for repair): Keep bleed screw (1) open until new brake fluid flows out.

    IMPORTANT Pumping the brake pedal not required.

  3. 6 Close bleed screw (1).

    For 6, or 8-piston brake calipers on the front axle and for vehicles with code (Z07) Maximum protection: Note different sequence for left and right-hand drive vehicles.

  4. 7 Repeat process at bleed screws (2, 3, 4, 5, 6).

    IMPORTANT The numbering of the bleed screws (1, 2, 3, 4, 5, 6) indicates the opening sequence.

    IMPORTANT

    IMPORTANT Required total quantity of brake fluid: approx. 0.75 l.

  5. 8 Detach bleed hose (02) and bleed wrench (03) and fit caps (10) to bleed screws (1, 2, 3, 4, 5, 6).
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