34 11 000 Removing and Installing/Renewing Brake Pads on Both Front Disc Brakes

34 11 000 Removing And Installing/Replacing Brake Pads On Both Front Disc Brakes (M3/1-Series M Coupe)

Special tools required:







IMPORTANT:
- Brake pad wear sensor: after removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
- Retaining spring: for vehicles older than 48 months it is recommended to replace the retaining spring.

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner BMW part no. 83 19 2 154 780 and apply a thin coating of brake pad paste BMW part no. 83 19 2 158 851.
European version only.
Sport brake pads for M3:
- Due to the increased strain on the brake discs, we recommend that you also replace the brake discs when fitting a set of brake pads
- It is absolutely essential to replace the brake discs if cracked ≥ 13 mm even before the brake pad is worn







Necessary preliminary tasks:
- Remove wheels.
- Remove brake pad wear sensor







Lever out retaining spring (1) in direction of arrow towards rear.

Installation note:
Replace retaining spring (1).
Attach retaining spring (1) first at top and bottom and then allow retaining lug (2) to engage in recess of brake caliper housing.







Remove plastic plugs (1).







Left:
Pull brake pad wear sensor (1) towards rear out of pad.
Release guide screws (2) with special tool 34 1 080. Withdraw brake calliper backwards.

Installation note:
Only clean guide bolts; do not grease.

Check threads.
Replace all guide screws which are not in perfect condition.
Tightening torque 34 11 4AZ.







Press back brake pads and piston with special tool 34 6 320.

IMPORTANT:
When forcing piston back:
- Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paintwork.







Press brake pads inwards and remove.
The two brake pads are seated with a spring in the piston or in the brake caliper housing and must not be mixed up.

IMPORTANT: Mark any worn brake pads.

In the event of one-sided brake pad wear, do not change brake pads round.
Observe minimum thickness of brake pads.
Clean brake pads.
Do not apply grease to brake lining backplate.







Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure.
- Compare measurement result and lowest value with setpoint value.







IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH).







Check dust boot (1) for damage and replace if necessary.
Clean contact surface (2) of brake piston with brake cleaner and apply a thin coating of brake pad paste.

IMPORTANT: Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.







Clean contact surfaces (1) and (2) of brake pad T-heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.

NOTE: Grease contact surfaces on brake calliper at top and bottom.







IMPORTANT:
- Do not grease contact surface (1).
- Clean contact surface (1) with brake cleaner.
Contact surface must be free from oil and grease.







Brake pad with adhesive film must be installed in each case on the outside in direction of travel.
Detach protective film (1) from brake pad and install pad.







So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner and apply a thin coating of brake pad paste.







So as not to damage the surface coating, if possible do not mechanically clean pad guides (1). Instead, clean with brake cleaner and apply a thin coating of brake pad paste.







NOTE:
After completing work:
- Fully depress brake pedal several times so that brake pads contact brake discs.
- When installing new brake pads 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.
- If necessary, when replacing pads, reset CBS display in accordance with factory specification.