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Brakes, suspension & tyres BMW 3-Series 2005 - 2008 Diesel 330d - 3.0

OnDemand step-by-step maintenance & repair BETA

BMW 3-Series 2005 - 2008  | 330d - 3.0 Brakes, suspension & tyres

  • time 20 minutes
  • difficulty 3
Start with the front wheels
With the wheel off the ground, check for wear in the wheel hub bearings by grasping the wheel and trying to rock it. Very slight play is OK, but if the movement is appreciable, you should seek further advice
Now remove the wheel
Check condition of the brake discs. Some light scoring is normal on the area in contact with the brake pads, but if heavy scoring and/or cracks are found on the disc or around the wheel bolt holes, the disc must be renewed. ALWAYS replace both front discs & pads
Now locate the brake pads, there are two, one on each side of the disc. Locate the brake pad's wearing surface, it's the wear material that is pressed against the brake disc to slow the vehicle when the brake pedal is applied
Using a ruler, measure the approximate thickness of the remaining wear material on the brake pad. If it is less than 3.7mm, all front pads need replacement. If you need to replace the front pads, click below
- Close + Open

Front brake pads replacement

Warning: Renew both sets of front brake pads at the same time – never renew the pads on only one wheel, as uneven braking may result. Note that the dust created by wear of the pads may contain asbestos, which is a health hazard. Never blow it out with compressed air, and don’t inhale any of it. An approved filtering mask should be worn when working on the brakes. DO NOT use petrol or petroleum-based solvents to clean brake parts; use brake cleaner or methylated spirit only.
1 Apply the handbrake, then slacken the front roadwheel bolts. Jack up the front of the vehicle and support it on axle stands. Remove both front roadwheels.
2 Follow the relevant accompanying photos for the pad renewal procedure. Be sure to stay in order and read the caption under each illustration, and note the following points:
  1. New pads may have an adhesive foil on the backplates. Remove this foil prior to installation.
  2. Clean the caliper guide surfaces with non-abrasive cleaners only, and apply a little brake assembly grease (BMW pad paste 83 23 9 407 830 or Copperslip).
  3. When pushing the caliper piston back to accommodate new pads, keep a close eye on the fluid level in the reservoir.
  4. BMW insist that the brake pad wear sensor must be renewed if it’s been removed.
  5. On vehicles over 2 years old, BMW recommend that a new retaining spring is fitted.
Using a screwdriver between the edge of the disc and the caliper body, lever the caliper outwards a little, forcing the piston to retract. This provides clearance for the pads to be removed from a worn disc
Open the plastic box on the inner wing (retaining clip arrowed) . . .
. . . and disconnect the pad wear sensor wiring plug (white)
Prise up the bleed screw plastic cap and release the pad wear sensor wiring loom
Pull the wear sensor from the inner pad. Note that BMW insist the sensor is not re-used, as the retaining clip distorts during removal
Using a screwdriver, compress the spring and remove it from the caliper
Prise out the rubber caps . . .
. . . and unscrew the guide pins using a 7.0 mm Allen key/bit
Slide the caliper and pads from the mounting bracket/disc
Pull the outer pad from the caliper . . .
. . . then pull the inner pad from the caliper piston
To avoid straining the rubber hose, suspend the caliper from the coil spring
Use brake cleaner and a soft brush to clean the caliper/bracket mounting surfaces
Measure the thickness of the pads friction material – if it’s less than 2.0 mm on any pad, all the front pads must be renewed
If new pads are to be fitted, push the piston back into the caliper body using a retraction tool. Keep an eye on the brake fluid level whilst pushing the piston back
Apply a very thin smear of brake assembly grease (supplied with genuine pad kits) to the mounting edges of the pads backing plate
Fit the outer pad to the mounting bracket, ensuring the friction material is against the disc surface
Press the inner pad clip into the caliper piston . . .
. . . then slide the caliper into place
Tighten the guide pins to the specified torque . . .
Guide pin bolts: Nm Ibf ft
  Socket head 30 22
  Hexagon head 35 26
. . . and refit the rubber caps
Use a screwdriver to manoeuvre the retaining spring . . .
. . . back into place
Slide the new pad wear sensor into the inner pad groove . . .
. . . clip the wear sensor wiring loom back under the bleed screw cap strap . . .
. . . and reconnect the sensor wiring plug
3 Depress the brake pedal repeatedly, until the pads are pressed into firm contact with the brake disc, and normal (non-assisted) pedal pressure is restored.
4 Repeat the above procedure on the remaining front brake caliper.
5 Apply the little anti-seize grease to the hub surface, then refit the roadwheels, lower the vehicle to the ground and tighten the roadwheel bolts to 120 Nm (89 Ibf ft).
6 Check the hydraulic fluid level.
Caution: New pads will not give full braking efficiency until they have bedded-in. Be prepared for this, and avoid hard braking as far as possible for the first hundred miles or so after pad renewal.
TIP! - Virtually all cars have this inspection window in the brake caliper body, you can usually see the brake pad thickness from here
Now quickly check all the brake pipes for condition, check for any leaks, also inspect the rubber gaitors for integrity.
It is a similar procedure with the rear wheels. Check for wheel bearing movement, then remove the wheel
Check condition of the rear brake discs
Locate rear brake pads
Measure brake pad wear thickness. If it is less than 3.7mm, all rear pads need replacement. If you need to replace the rear pads, click below
- Close + Open

Rear brake pads replacement

Warning: Renew both sets of rear brake pads at the same time – never renew the pads on only one wheel, as uneven braking may result. Note that the dust created by wear of the pads may contain asbestos, which is a health hazard. Never blow it out with compressed air, and don’t inhale any of it. An approved filtering mask should be worn when working on the brakes. DO NOT use petrol or petroleum-based solvents to clean brake parts; use brake cleaner or methylated spirit only.
1 Apply the handbrake, then slacken the rear roadwheel bolts. Jack up the rear of the vehicle and support it on axle stands. Remove both rear roadwheels.

Teves caliper

2 Follow the relevant accompanying photos for the pad renewal procedure. Be sure to stay in order and read the caption under each illustration, and note the following points:
  1. New pads may have an adhesive foil on the backplates. Remove this foil prior to installation.
  2. Clean the caliper guide surfaces with non-abrasive cleaners only, and apply a little brake assembly grease (BMW pad paste 83 23 9 407 830 or Copperslip).
  3. When pushing the caliper piston back to accommodate new pads, keep a close eye on the fluid level in the reservoir.
  4. BMW insist that the brake pad wear sensor must be renewed if it’s been removed.
  5. On vehicles over 2 years old, BMW recommend that a new retaining spring is fitted.
Using a screwdriver between the edge of the disc and the caliper body, lever the caliper outwards a little, forcing the piston to retract. This provides clearance for the pads to be removed from a worn disc
Undo the nut . . .
. . . pull back the wheel arch liner, and disconnect the pad wear sensor wiring plug
Pull off the bleed screw rubber cap to release the pad wear sensor wiring loom
Pull the wear sensor from the inner pad. Note that BMW insist the sensor is not re-used, as the retaining clip distorts during removal
Using a screwdriver, compress the spring and remove it from the caliper
Prise out the rubber caps . . .
. . . unscrew the guide pins with a 7.0 mm Allen key/bit . . .
. . . and slide the caliper with pads from the mounting bracket
Prise away the outer brake pad . . .
. . . and pull the inner brake pad clip from the caliper piston
To avoid straining the rubber hose, suspend the caliper from the vehicle body
Measure the thickness of the pads friction material – if it’s less than 2.0 mm on any pad, all the rear pads must be renewed
Use brake cleaner and a soft brush to clean the caliper/bracket mounting surfaces
If new pads are to be fitted, push the piston back into the caliper body using a retraction tool. Keep an eye on the brake fluid level whilst pushing the piston back
Apply a very thin smear of brake assembly grease (supplied with genuine pad kits) to the mounting edges of the pads backing plate
Fit the outer brake pad to the caliper mounting bracket, ensuring the friction material is against the disc surface
Press the inner brake pad retaining clip into the caliper piston . . .
. . . and slide the caliper into position
Tighten the guide pins to 35 Nm (26 Ibf ft) . . .
. . . and refit the rubber caps
Slide the new pad wear sensor into the inner pad groove . . .
. . . clip the wear sensor wiring loom back under the bleed screw cap strap and reconnect the sensor wiring plug
Use a screwdriver to lever the retaining spring . . .
. . . back into position

TRW caliper

3 Follow the relevant accompanying photos for the pad renewal procedure. Be sure to stay in order and read the caption under each illustration, and note the following points:
  1. New pads may have an adhesive foil on the backplates. Remove this foil prior to installation.
  2. Clean the caliper guide surfaces with non-abrasive cleaners only, and apply a little brake assembly grease (BMW pad paste 83 23 9 407 830 or Copperslip).
  3. When pushing the caliper piston back to accommodate new pads, keep a close eye on the fluid level in the reservoir.
  4. BMW insist that the brake pad wear sensor must be renewed if it’s been removed.
Using a screwdriver between the edge of the disc and the caliper body, lever the caliper outwards a little, forcing the piston to retract. This provides clearance for the pads to be removed from a worn disc
Undo the nut . . .
. . . pull back the wheel arch liner, and disconnect the pad wear sensor wiring plug
Pull off the bleed screw rubber cap to release the pad wear sensor wiring loom
Pull the wear sensor from the inner pad. Note that BMW insist the sensor is not re-used, as the retaining clip distorts during removal
Undo the guide pin bolts on the inside of the caliper . . .
. . . counterhold the guide pins with an open-ended spanner as the bolts are slackened
Slide the caliper from the mounting bracket . . .
. . . and suspend it from the vehicle body to prevent straining the rubber fluid hose
Pull the outer brake pad from the mounting bracket . . .
. . . followed by the inner pad
Remove the lower pad shim . . .
. . . and the upper pad shim
Measure the thickness of the pads friction material – if it’s less than 2.0 mm on any pad, all the rear pads must be renewed
Use brake cleaner and a soft brush to clean the caliper/bracket mounting surfaces
Refit the upper . . .
. . . and lower pad shims
Apply a very thin smear of brake assembly grease (supplied with genuine pad kits) to the mounting edges of the pads backing plate
Fit the inner brake pad to the mounting bracket . . .
. . . and the outer brake pad. Ensure the friction material is against the disc surface
If new pads are to be fitted, push the piston back into the caliper body using a retraction tool. Keep an eye on the brake fluid level whilst pushing the piston back
Manoeuvre the caliper back into position
Apply a little thread locking compound to the guide pin bolts . . .
. . . and tighten them to 35 Nm (26 Ibf ft)
Slide the new pad wear sensor into the slot in the inner brake pad backplate . . .
. . . reconnect the sensor wiring plug, refit the wheel arch liner, and secure the wiring loom with the retaining clips

All calipers

4 Depress the brake pedal repeatedly, until the pads are pressed into firm contact with the brake disc, and normal (non-assisted) pedal pressure is restored.
5 Repeat the above procedure on the remaining rear brake caliper.
6 Apply the little anti-seize grease to the hub surface, then refit the roadwheels, lower the vehicle to the ground and tighten the roadwheel bolts 120 Nm (89 Ibf ft).
7 Check the hydraulic fluid level.
Caution: New pads will not give full braking efficiency until they have bedded-in. Be prepared for this, and avoid hard braking as far as possible for the first hundred miles or so after pad renewal.
Take a good look around brake system and the suspension arm, check for any leaks. Seek advice should you any detect leakage and/or serious damage to the components Should the rear shock absorber need to be replaced, click below
- Close + Open

Rear shock absorber replacement

Removal

1 Check the front wheels, then jack up the rear of the car and support it on axle stands. To improve access, remove the rear roadwheel.

Saloon models

2 Lift out the luggage compartment floor panel, prise up the centre pins, lever out the 4 expansion rivets, then prise out the caps, undo the 2 bolts and remove the boot lid sill trim panel (see illustrations) .
Prise up the centre pins and remove the plastic expansion rivets
Prise up the caps and remove the bolts beneath
3 Remove the warning triangle from the holders (where applicable), then rotate the holders anti-clockwise and remove them (see illustration) .
Remove the warning triangle holder
4 Undo the Torx bolt securing the luggage stowage anchor (see illustration) .
Undo the Torx bolt securing the stowage anchor
5 Prise up the centre pin and lever out the retaining clips (see illustrations) .
Prise up the centre pins . . .
. . . and remove the plastic expansion rivets
6 Remove the luggage compartment side trim panel.

Touring models

7 Fold the rear seat backrest forwards.
8 Remove the luggage compartment floor panel.
9 Pull up the plastic cover over the seat belt inertia reel, and feed the seat belt though the slot (see illustration) .
Pull up the cover over the inertia reel

Left-hand panel

10 Operate the release handle, open the access panel in front of the rear lights, and lift it from place.
11 Remove the 2 bolts, and prise out the expansion rivet at the top edge of the luggage compartment side trim panel (see illustration) .
Undo the 2 bolts and prise out the plastic expansion rivet
12 Disconnect the power outlet wiring plug (where applicable), prise out the expansion rivet and undo the bolt securing the stowage hook (see illustration) . Lift the panel from place.
Undo the stowage hook bolt and prise out the plastic expansion rivet

Right-hand panel

13 Rotate the fasteners anti-clockwise and lift out the panel above the battery.
14 Prise up the centre pin, remove the plastic expansion rivet, then undo the stowage hook Torx bolt at the lower section of the side panel (see illustration) .
Prise out the expansion rivets and undo the stowage hook bolt
15 Undo the 2 bolts at the top of the panel, prise up the centre pin and remove the plastic expansion rivet (see illustration) .
Undo the bolt and remove the expansion rivet
16 Lift the side panel from place.

All models

17 Position a jack underneath the hub carrier, and raise the jack so that it is supporting the weight of the carrier. This will prevent the hub carrier dropping when the shock absorber is unbolted.
18 Slacken and remove the nut securing the shock absorber to the lower mounting (see illustration) . Counterhold the shock absorber shaft with a spanner. Note that a new nut must be fitted.
Rear shock absorber lower mounting nut
19 From within the luggage compartment, prise up the rubber cap, then unscrew the upper mounting nut, counterholding the shock absorber shaft with a spanner (see illustrations) . Lower the shock absorber out from underneath the car. Note that a new nut must be fitted.
When refitting the rubber cap above the shock absorber mounting, the arrow must point upwards
Rear shock absorber upper mounting nut
20 If required, undo the two bolts and remove the mounting from the suspension arm (see illustrations) . Note that new bolts must be fitted.
Undo the shock absorber mounting bolts . . .
. . . and manoeuvre the mounting from place

Refitting

21 If removed, refit the lower mounting to the suspension arm, and tighten the bolts to the specified torque.
Lower mounting bolts: Nm Ibf ft
  M10 60 44
  M12 100 74
22 Ensure the upper mounting and body contact surfaces are clean and dry.
23 Manoeuvre the shock absorber into position, and fit the new upper mounting nut.
24 Engage the lower end of the shock absorber with the mounting, then fit the nut, tightening it to 37 Nm (27 Ibf ft).
25 Tighten the upper mounting nut to the specified torque setting then refit the rubber cap over the upper mounting, noting that the arrow must point upwards.
Upper mounting nut: Nm Ibf ft
  M10 27 20
  M14 37 27
26 Refit the luggage compartment trim panel.
27 Refit the roadwheel and lower the car to the ground. Tighten the roadwheel bolts to 120 Nm (89 Ibf ft).
Check rubber exhaust mountings
Before refitting the tyres, take a look at the tyre tread, there is a UK legal requirement to have a minimum of 1.6mm remaining tread depth. Also check sidewalls for any kerb damage
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