34 11 000 Removing and installing/replacing brake pads on both front disc brakes
Special tools required:
Attention!
- Brake pad wear sensor: After removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
- Retaining pins and expanding 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, but rather clean with brake cleaner BMW TI. number 83 19 2 154 780 and apply a thin coating of break pad paste BMW TI. number 83 19 2 158 851 (3 gr.) or 83 19 2 158 852 (100 gr.).
Spread brake pad paste onto the marked surfaces using a brush!
Observe GUIDELINE FOR APPLYING BRAKE PAD PASTE ON BRAKE PADS AND BRAKE ANCHOR PLATE !
Necessary preliminary tasks:
- Remove FRONT WHEELS .
- Remove BRAKE PAD WEAR SENSOR .
Pull the brake pad wear sensor (1) toward the front out of the brake bad (left side only).
Release guide screw (3).
If necessary, grip at hexagon head (2).
Feed brake hose out of holder (4).
Tilt brake caliper upwards.
Installation note:
Replace guide screw.
Tightening torque 34 11 3AZ .
Remove brake pads (1) in direction of arrow from caliper carrier.
Attention!
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 measuring result and lowest value with SETPOINT VALUE .
Attention!
New brake pads may only be installed if the brake disk thickness is greater than the MINIMUM BRAKE DISC THICKNESS .
Attention!
If new brake pads are mounted on a brake disc, the following must be observed:
- Bevel edges in the area (1) slightly (dimension A must not exceed maximum 1 mm).
These procedures apply for all the following described brake systems.
Press brake piston fully back with special tool 34 1 050 .
Attention!
When pressing piston back, note brake fluid level in expansion tank.
Overflowing brake fluid will damage the paintwork.
Check dust boot for damage and renew if necessary.
Clean contact surface (1) of brake piston with brake cleaner and apply a thin coating of brake pad paste.
Attention!
Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.
Clean contact surface (1) of brake caliper 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 the guide surface (1) for the brake pads on the brake caliper mounting bracket. Clean guide surface (1) with brake cleaner and apply a thin coating of brake pad paste.
Apply a thin coating of brake pad paste to both sides of T-head of brake pad in area (1).
Attention!
Brake pad with bulge (1) is intended for accommodating the brake pad wear sensor and must be fitted on the piston side.
- 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" mark.
- Read and comply with notes on BREAKING-IN NEW BRAKE DISCS/BRAKE PADS .
- If necessary, when replacing brake pads, reset CBS display as per factory specification.
Replacement:
Remove lining spring (1) and replace.
Installation note:
So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1) for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner and apply a thin coating of brake pad paste.