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 do not 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.
Apply the handbrake, then loosen the front roadwheel nuts. Jack up the front of the vehicle and support it securely on axle stands. Remove both front roadwheels.
Follow the accompanying photos for the pad renewal procedure. Be sure to stay in order and read the caption under each illustration.
Some models are fitted with wire springs between the pads …
… squeeze the sides and remove them
If there’s a wear lip on the edge of the disc, you may need to lever between the disc and caliper body to force the piston back into the caliper a little
Undo the lower guide pin bolt (arrowed) …
… pivot the caliper upwards …
… and secure it to the spring to prevent straining the fluid hose
Remove the outer pad …
… followed by the inner pad
Remove the lower shims …
… and the upper shims
On models with wire springs, remove the upper shim …
… and lower shim
Clean the pad mounting surfaces using aerosol brake cleaner and a soft brush
Measure the thickness of the pad friction material – renew all 4 pads if it’s less than 2.0 mm (Sports suspension) or 1.0 mm (Except sports suspension)
Apply a thin smear of high-temperature anti-seize grease (Copperslip) to the pad backplate where it contact the caliper mounting bracket
Fit the anti-rattle plate to the new pad backing plate
Refit the lower shim (wire spring type shown) …
… and upper shim
Fit the outer pad – ensure the friction material is against the disc ...
… followed by the inner pad
If new pads have been fitted, push the piston back into the caliper using a retraction tool. Keep an eye on the fluid level in the reservoir
Lower the caliper into place and refit the lower guide pin bolt …
… and tighten it to the specified torque
|Guide pin bolts:
| All except 270 mm diameter discs
||50 Nm (37 Ibf ft)
| 270 mm diameter discs
||26 Nm (19 Ibf ft)
Refit the upper wire spring (where applicable) …
… and the lower wire spring
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.
Repeat the above procedure on the remaining front brake caliper.
Refit the roadwheels, then lower the vehicle to the ground and tighten the roadwheel nuts to 110 Nm (81 Ibf ft).
Check the hydraulic fluid level.
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.