Loosen the front wheel bolts and chock the rear wheels, then jack up the front of the car and support it on axle stands. Remove the front roadwheels, noting how the locating peg fits into the back of the wheel. Using a screwdriver, carefully extract the brake pad retaining spring, taking care not to deform it. Remove the protective caps over the two caliper guide pins and unscrew both pins using a 7 mm Allen key. Withdraw the caliper off the brake pad and caliper bracket, ensuring not to stretch the brake hose, and if necessary, lever the pads away from the disc with a flat bladed screwdriver. Remove the inboard pad with spring clip retainer from the caliper piston and the outboard brake pad from the caliper bracket, then suspend the caliper using string or wire tied to a convenient suspension component, avoiding pressing the brake pedal while the caliper is removed. Measure the thickness of the pad friction linings; if any one pad lining has worn down to the specified minimum, all four front pads must be renewed, and do not interchange pads to even out wear. Clean the caliper and bracket with an aerosol brake cleaning product and an old paint brush, inspecting the caliper piston and dust boot for signs of fluid leakage, as well as the guide pin rubber bushes, repairing or renewing as necessary. Remove any scale or rust from the outer rim of the brake disc with a wire brush or file, and inspect the visible surface of the brake disc for deep scoring, cracks, or grooves, or if brake judder or snatch has been a problem, carry out a more thorough inspection. If new pads are to be fitted, press the caliper piston back into its bore with a piston retraction tool or G-clamp, being careful not to damage the dust boot, and remove some fluid from the master cylinder reservoir to prevent overflowing. Position the outboard pad in the caliper bracket with the friction surface towards the disc, engage the spring clip retainer of the inboard pad with the caliper piston, and push the pad fully into contact with the piston before placing the caliper over the disc and onto the caliper bracket. Lubricate the guide pins with silicone grease, insert them into the caliper, and tighten both to the specified torque, then refit the protective caps to the guide pins. Refit the brake pad retaining spring clip, ensuring it sits behind the 'fingers' of the caliper, and press the brake pedal several times to bring the pads up to the disc. Repeat the operations on the other front brake, then refit the roadwheels, lower the car, and tighten the wheel bolts in a diagonal sequence to the specified torque. Check the brake fluid level and top-up if necessary, and if new pads have been fitted, avoid hard braking for the first few hundred miles to allow the linings to bed-in.