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Home >> BMW >> 2018 >> M4 2D Convertible, Automatic DCT Trans >> Repair and Diagnosis >> Transmission >> Clutch >> Clutch - Repair -- M4 (F82 & F83) >> 21 52 Clutch Master Cylinder And Slave Cylinder >> Removing and installing/replacing clutch master cylinder

Removing and installing/replacing clutch master cylinder

Necessary preliminary work: 

Removal: 

Turn locks (1) 90° counter-clockwise.

Lift clamp (2).

Remove cover (3).

G13802887Courtesy of BMW OF NORTH AMERICA, INC.

Draw off brake fluid up to supply hose (1) of clutch hydraulic system.

Detach supply hose (1) from expansion tank.

G13802913Courtesy of BMW OF NORTH AMERICA, INC.

Detach retainers (1).

Slide out bolts (2).

Remove over-center helper spring.

G05778612Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) on clutch master cylinder (2).

G09849905Courtesy of BMW OF NORTH AMERICA, INC.

Detach return spring (1).

Detach retaining clip (3) and pull clutch pedal with clutch master cylinder off bearing support.

Press bolt end (2) together and remove bolt.

G09849911Courtesy of BMW OF NORTH AMERICA, INC.

Detach clamp (1) with a screwdriver (2).

IMPORTANT: Protect the carpet from contamination with brake fluid using suitable agents.

Detach hydraulic line from clutch master cylinder (3).

G04725960Courtesy of BMW OF NORTH AMERICA, INC.

Detach supply hose (1) from clutch master cylinder.

IMPORTANT: Do not pull supply hose completely into passenger compartment.
G04725961Courtesy of BMW OF NORTH AMERICA, INC.

Lever clutch switch (1) out of clutch master cylinder (2) with a screwdriver.

Release plug connection (3) and disconnect connector (4) from clutch switch (1).

G04725962Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Installation note: 

The clutch switch is secured against incorrect assembly.

The clutch switch must snap audibly into place.

Engage connector (4) in plug connection (3).

Lock clutch switch (1) with clutch master cylinder (2).

G04725962Courtesy of BMW OF NORTH AMERICA, INC.

Plug supply hose (1) into connection on clutch master cylinder.

G04725961Courtesy of BMW OF NORTH AMERICA, INC.

Plug hydraulic line into clutch master cylinder (3) and secure with clamp (1).

G04725960Courtesy of BMW OF NORTH AMERICA, INC.

Press bolt ends (2) together and remove bolt.

Slide clutch pedal with clutch master cylinder onto bearing support and secure with retaining clip (3).

Attach return spring (1).

Part  : Replace retaining clip and bolt.

The retaining clip must be seated with both shanks in the bolt groove.

G09849911Courtesy of BMW OF NORTH AMERICA, INC.

Tighten screws (1) on clutch master cylinder (2).

Tightening torque 21 52 2AZ .

G09849905Courtesy of BMW OF NORTH AMERICA, INC.

Install over-center helper spring.

Slide in bolts (2).

Engage retainers (1) audibly.

Part  : Replace retaining clips and bolts.

Installation note: 

Lightly grease bolts (2).

G05778612Courtesy of BMW OF NORTH AMERICA, INC.

Connect supply hose (1) to expansion tank.

Top up brake fluid up to supply hose (1) of clutch hydraulic system.

G13802913Courtesy of BMW OF NORTH AMERICA, INC.

Install cover (3).

Insert clamps (2).

Turn locks (1) 90° clockwise.

G13802887Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: After completing repair work, bleed CLUTCH HYDRAULIC SYSTEM .

Required follow-up work: