34 00 025 Replacing fluid in ABS/ASC+T brake system

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: When carrying out repairs to the brake system, follow the procedure set out in Bleeding brake system with DSC.

Open cover (1).

Connect bleeder unit to expansion tank (2) and switch on.

IMPORTANT: Check relevant Operating Instructions for each device.
Charging pressure should not exceed 2 bar.

Fig 1: Identifying Expansion Tank And Cover

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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 2: Connecting Bleeder Hose With Collecting Tray To Bleeder Valve On Rear Right Brake Caliper

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NOTE: The clutch slave cylinder must be scavenged in cars with manual transmissions.

Switch off bleeder unit and remove from expansion tank.

Check brake fluid level. If necessary, top up/draw off to max. level.

Close expansion tank.

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

Fig 3: Rubber Seal (1) In Sealing Cap

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