A 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 Chock the front wheels, slacken the rear roadwheel bolts, then jack up the rear of the vehicle and support it on axle stands (see Jacking and vehicle support). Remove the rear roadwheels.
2 Slacken and remove the caliper lower guide pin bolt, and swing the caliper up, pivoting around the top guide pin bolt, and tie it in place.
3 Withdraw the inner and outer pads from the caliper bracket, along with the anti-rattle shims (see illustration).
4 Recover the upper and lower pad support plates from the caliper mounting bracket.
5 First measure the thickness of the friction material of each brake pad. If either pad is worn at any point to the specified minimum thickness or less, all four pads must be renewed. Also, the pads should be renewed if any are fouled with oil or grease; there is no satisfactory way of degreasing friction material, once contaminated. If any of the brake pads are worn unevenly, or fouled with oil or grease, trace and rectify the cause before reassembly.
6 If the brake pads are still serviceable, carefully clean them using a clean, fine wire brush or similar, paying particular attention to the sides and back of the metal backing. Clean out the grooves in the friction material, and pick out any large embedded particles of dirt or debris. Carefully clean the pad locations in the caliper body/mounting bracket.
4.4j If new pads have been fitted, before refitting the caliper, push back the caliper piston whilst opening the bleed screw. This is to prevent any dirt/debris being forced back up the hydraulic circuit in the ABS modulator
7 Prior to fitting the pads, check that the guide pins are free to slide easily in the caliper body, and check that the rubber guide pin gaiters are undamaged. Brush the dust and dirt from the caliper and piston, but do not inhale it, as it is a health hazard. Inspect the dust seal around the piston for damage, and the piston for evidence of fluid leaks, corrosion or damage. If attention to any of these components is necessary, refer to Section 9.
8 If new brake pads are to be fitted, the caliper piston must be pushed back into the cylinder to make room for them. In order to retract the piston, the piston must be turned clockwise
4.4k Close the bleed screw as soon as the piston is retracted, then refit the caliper and tighten the bolts to the specified torque as it is pushed into the caliper. Toyota tool No SST 09719 -14020 is available to retract the pistons, as are several available from good accessory/parts retailers. Clamp off the flexible brake hose leading to the caliper then connect a brake bleeding kit to the caliper bleed nipple. Open the bleed nipple as the piston is retracted, the surplus brake fluid will then be collected in the bleed kit vessel. Apply pressure to the piston and rotate it clockwise at the same time, until the piston rotates freely, then align the piston 'stopper' groove with the caliper protrusion. Close the bleed nipple just before the caliper piston is pushed fully
■ Psd Suppon Plain
5.3 Rear brake pad details
5.8 Retract the caliper piston by turning it clockwise until it turns freely, then align the stopper grooves and caliper protrusion into the caliper (see illustration). This should ensure no air enters the hydraulic system Note: The ABS unit contains hydraulic components that are very sensitive to impurities in the brake fluid. Even the smallest particles can cause the system to fail through blockage. The pad retraction method described here prevents any debris in the brake fluid expelled from the caliper from being passed back to the ABS hydraulic unit as well as preventing any chance of damage to the master cylinder seals.
9 Refit the pad support plates to the caliper mounting bracket, then slide the brake pads into position in the caliper, ensuring each pad's friction material is facing the brake disc. Fit the anti-rattle shims to the back of each pad, ensuring they are correctly located.
10 Untie the caliper and lower it into position. Insert the caliper lower guide pin bolt, and tighten it to the specified torque.
11 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.
12 Repeat the above procedure on the remaining rear brake caliper.
13 Check the operation of the handbrake and, if necessary, carry out the adjustment procedure as described in Section 17.
14 Refit the roadwheels, then lower the vehicle to the ground and tighten the roadwheel bolts
15 Check the hydraulic fluid level as described in Weekly checks.
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 kilometers or so after pad renewal.
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