34 21 200 Removing and installing/replacing both rear disc brakes

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Special tools required:

34 1 050

Necessary preliminary tasks:

Remove wheels, see 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

NOTE: After completing work:

Fully depress brake pedal several times so that brake linings contact brake discs.
When installing new brake linings at front and rear axles, brake fluid level must be brought up to "MAX" marking.
Read and comply with notes on braking in new brake discs / brake pads, see 34 00 ... General information on braking in new brake discs / brake pads .

Remove cover plug (1).

Right side:

Disconnect plug connection for brake lining wear sensor.

If necessary, replace brake lining wear sensor.

Fig 1: Cover Plug

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Unscrew guide screws (2).

Installation:

Only clean guide screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque: 34 21 5AZ, see 34 21 REAR BRAKE .

Fig 2: Guide Screw

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Lift out retaining spring (3).

Withdraw brake caliper backwards.

Fig 3: Locating Retaining Spring

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Turn piston fully back with special tool 34 1 050 .

IMPORTANT: When turning back the piston, watch the brake-fluid level in the expansion tank, as overflowing brake fluid will destroy the paintwork.

Fig 4: Turning Piston With Special Tool (34 1 050)

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Remove outer brake lining.

Inner brake lining is located with its spring in the piston.

IMPORTANT: Mark any worn brake linings.

In the event of one-sided brake lining wear, do not change brake linings round.

New brake linings may only be installed if the brake disc thickness is greater than or equal to the minimum brake disc thickness (MIN TH), see 34 21 REAR BRAKE DISCS E83 .

Observe minimum thickness of brake linings, see 34 21 REAR BRAKE DISCS E83 .

Clean brake linings.

Do not grease backs of brake linings sleeve.

Fig 5: Removing Outer Brake Lining

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Check dust sleeve (1) for damage and replace if necessary.

Clean contact face (2) of brake piston and apply a thin coating of anti-squeak compound.

IMPORTANT: Dust sleeve must not come into contact with anti-squeak compound as this may cause the dust sleeve to swell.

Fig 6: Contact Face And Dust Sleeve

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Clean contact faces (1...2) of brake lining hammer heads/brake caliper housing and coat with anti-squeak compound.

Fig 7: Contact Face Of Brake Piston

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Clean contact face (3) of brake caliper and apply a thin coating of anti-squeak compound.

Fig 8: Brake Caliper And Screw

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Clean brake caliper mounting bracket at hammer head guides and apply a thin coating of anti-squeak compound.

Fig 9: Locating Brake Caliper Mounting Bracket

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