34 00 050 Bleeding brake system with DSC: Overview

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NOTE: Read and comply with General Information.

When replacing or repairing, observe the filling and bleeding instructions for the following parts:

Tandem brake master cylinder
Hydraulic unit
Components and connecting lines which are fitted between these assemblies.

Connect bleeder unit with max. 2 bar filling pressure.

A second person is needed to help carry out this work.

Unclip retaining tabs (1).

Pull cover (3) out of guide (2) and remove.

Fig 1: Retaining Tabs, Cover And Guide

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Connect DIS.

Select path: Service functions - Chassis/Suspension - Slip control systems - Bleeding procedure.

Connect brake fluid changer to expansion tank and switch on.

IMPORTANT: Check relevant Operating Instructions for each device.

Charging pressure should not exceed 2 bar.

Fig 2: Connecting Brake Fluid Changer To Expansion Tank

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Flushing brake system completely

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve and purge until clear, bubble-free brake fluid emerges.

Close bleed valve.

Follow same procedure on rear left, front right and front left wheel brake.

Fig 3: Connecting Bleeder Hose With Collecting Tray

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Bleeding rear-axle brake circuit

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor; clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at rear left.

Fig 4: Connecting Bleeder Hose With Collecting Tray

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Bleeding front-axle brake circuit

Connect bleeder hose with collecting tray to bleeder valve on front right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor, clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at front left.

Fig 5: Bleeding Front-Axle Brake Circuit

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Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level.

Close expansion tank.

NOTE: Pay attention to rubber seal (1) in sealing cap.

Fig 6: Brake Fluid Level Mark And Sealing Cap Rubber Seal

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