Removing and installing/replacing both brake pads of rear disc brakes (Cooper Convertible)
Special tools required:
- 34 1 280
- 34 6 306
- 34 6 307
- 34 6 308
- 2 294 516
Attention!
- Do not mechanically clean the guide surfaces for brake pads to prevent damage to the surface coating. Clean the guide surfaces using brake cleaner, BMW part number 83 19 2 154 780. Carefully clean highly contaminated guide surfaces with a suitable tool (e.g. brass wire brush, nylon brush). Then thinly coat with brake pad paste BMW part 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 REGULATION on applying brake pad paste to brake pads and brake anchor plates!
- Retaining pins and expanding spring: For vehicles older than 48 months it is recommended to replace the retaining spring.
- Brake pad wear sensor: After removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
- A CBS reset must be done after every brake pad exchange.
- With a sanded brake pad wear sensor (display in CBS menu): CBS reset possible in vehicle.
- With a non-sanded brake pad wear sensor: CBS reset only possible via diagnostic system.
Preliminary work needed:
- Remove WHEELS .
- Remove BRAKE PAD WEAR SENSOR .
Removal:
Unscrew guide bolts (1).
If necessary, grip at hexagon head (2).
Attention!
Both guide bolts must be released and then the brake caliper detached towards the rear!
The springs may be bent when only one bolt is released and the brake caliper is folded up!
Remove brake pads (1) in arrow direction from brake anchor plate.
Attention!
Mark any worn brake pads.
In the event of one-sided brake lining backplate wear, do not change brake pads round.
Observe minimum thickness of brake pads.
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.
Installation:
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 applies for all the following described brake systems.
Attention!
When pressing piston back, note brake fluid level in expansion tank.
Overflowing brake fluid will damage the paintwork.
Screw brake piston into brake caliper using special tool 34 6 306, 34 6 307, 34 6 308, 2 294 516.
Attention!
Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.
Check dust boot for damage and replace if necessary.
Clean contact surface (1) of brake piston with brake cleaner and apply a thin coating of brake pad paste.
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 dent (1) is intended for accommodating the brake pad wear sensor and must be fitted on the piston side.
For replacement:
Replace lining spring (1).
Install brake pad (1) in the brake anchor plate in arrow direction.
Mount brake caliper.
Insert guide bolts (1) and tighten down.
If necessary, grip at hexagon head (2).
Installation note:
Replace guide bolts.
Tightening torque 34 21 3AZ .
Required follow-up work:
- Install the BRAKE PAD WEAR SENSOR .
- Mount the front WHEELS .
- 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 bre.aking in new brake discs/brake pads.