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Introduction Some 2010 Prius vehicles may experience rear brake squeak when backing up or moving forward during the ?rst few brake applications when the brakes are cold. An updated rear brake shim kit is available to reduce the likelihood of this condition occurring. Repair Procedure 1. Test drive the vehicle to con?rm the squeak is coming from the rear brakes. The condition occurs more frequently when backing up during light brake pedal application after cold soak. 2. Remove rear brake shims. Refer to the Technical Information System (TIS) 2010 Prius Repair Manual: Brake – Brake (Rear) Brake: Rear Brake: Removal 3. Clean the rear brake pad backing plates with a clean shop towel and apply a small amount of black disc brake grease to the backing plate of each rear brake pad. NOTE Make sure disc brake grease is not applied to the lining of the rear brake pads. 4. Install the No. 1 Anti-squeal shims. Install the No. 2 Anti-squeal shims. Figure 3. 5. Using the Variable Pin Wrench (SST 09960-10010), slowly rotate the caliper piston until the piston groove is positioned as shown in the illustration below. 6. Install new rear brake anti-squeal shims with brake pads into the rear caliper assemblies brackets. Refer to (TIS), 2010 Prius Repair Manual: Brake – Brake (Rear) Brake: Rear Brake: Installation NOTE • When installing the rear disc brake caliper assembly on the rear disc brake caliper mounting bracket, ensure the protrusion on the brake pad is centered in the caliper piston groove. • It is important to ensure the protrusion is not contacting the outer edges of the caliper piston groove. (both sides) 7. Road test the vehicle to con?rm the condition has been reduced.

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CAUTION: Refer to Brake Dust Caution in Cautions and Notices. 1. Inspect the fluid level in the brake master cylinder reservoir. 2. If the brake fluid level is midway between the maximum-full point and the minimum allowable level, then no brake fluid needs to be removed from the reservoir before proceeding. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, then remove brake fluid to the midway point before proceeding. 3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 4. Remove the rear tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels. 5. Install a hand tightened lug nut to retain the rotor to the hub. 6. Compress the caliper piston enough for clearance. Use a C-clamp (3). NOTE: NOTE: Use care to avoid damaging pin boot when rotating caliper. Support the brake caliper with heavy mechanic’s wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

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WARNING: Frequent inhalation of brake pad dust, regardless of material composition, could be hazardous to your health. Avoid breathing dust particles. NEVER use an air hose or brush to clean brush assembly. Use an OSHA-approved vacuum cleaner. REAR DISC BRAKE PADS Removal Raise and support vehicle. Remove wheels. Thoroughly clean outside of caliper to prevent dust and dirt from entering inside. Support caliper with a piece of wire to prevent damage to brake hose. Remove 2 caliper bolts and caliper from bracket. Remove pad shims and pads. Using vernier calipers, measure the thickness of each brake pad lining. Measurement does not include pad backing plate thickness. See DISC BRAKE SPECIFICATIONS . Remove pad retainers. Inspection Clean caliper thoroughly; remove any rust, and check for grooves and cracks. Check brake disc for damage and cracks. Measure brake pad thickness. See DISC BRAKE SPECIFICATIONS . If brake pad thickness is less than service limit, replace pads as a set. Installation 1. Install pad retainers. Apply Molykote M77 compound onto pad side of shim. Wipe excess grease off shim. Keep grease off discs and pads. Install brake pads and shims. Install inner pad with its wear indicator facing downward. If you are reusing pads, install in original position. Rotate caliper piston clockwise into cylinder, then align cutout in piston with tab on inner pad by turning piston back. See Fig. 15 . 2. Lubricate boot with rubber grease to avoid twisting. If boot is twisted, back it out and position properly. Install brake caliper. Install and torque caliper bolts to proper specification. See TORQUE SPECIFICATIONS . Install brake hose onto suspension arm with mounting bolt. After installation, check for leaks. Pump brake pedal several times to seat pads. Bleed brakes as necessary. See BLEEDING BRAKE SYSTEM . NOTE: Engagement of brake may require a greater pedal stroke immediately after brake pads have been replaced as a set. Several applications of brake pedal will restore normal pedal stroke.

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REAR DISC BRAKE PADS Removal Raise and support rear of vehicle. Remove wheels and release parking brake. Remove caliper shield (if equipped). Remove caliper mounting bolts. Remove caliper from bracket. Suspend caliper using wire. Remove brake pads. Inspection Using a vernier caliper, measure friction pad thickness. Service limit is .06″ (1.5 mm). Installation 1. Apply Molykote M77 compound to pad side of inner and outer pad shims. Install brake pads and shims. Rotate caliper piston clockwise in caliper (if necessary). Ensure cutout in piston aligns with tab on inner pad. 2. Avoid twisting piston boot. If boot is twisted, back out piston and reposition boot. Install brake caliper and parking brake cable. Install caliper shield. Tighten shield mounting bolts to specification. See TORQUE SPECIFICATIONS. 3. Pump brake pedal several times to seat pads. Bleed brakes as necessary. See BLEEDING BRAKE SYSTEM.

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1. Raise front of vehicle and support on stands. 2. Remove front wheels. 3. CAUTION: Remove brake fluid spillage immediately from paint work, with clean water. Loosen brake fluid reservoir-cap. Position a cloth around the reservoir to collect any fluid spillage. 4. Remove brake pads from caliper. 1) Remove ‘R’ clips. 2) Withdraw pins from caliper. 3) Remove anti-rattle spring. 4) Discard brake pads. 5. Clean all mating surfaces and remove brake dust, see WARNING above. 6. Repeat above procedure to remove opposite side brake pads. Installation 1. CAUTION: Make sure grease does not contact brake-pad friction surface or brake disc. To prevent brake squeal apply grease to the shoulders of the brake-pad back plate. Apply a uniform layer of grease to back plate shoulders, making sure the whole shoulder is covered. 2. CAUTION: Make sure the brake pads are fitted with the direction arrow following the direction of wheel rotation. Make sure the brake pads are fitted with the direction arrow following the direction of wheel rotation. 3. CAUTION: Retracting the caliper piston may cause the fluid reservoir to over-flow. Remove brake fluid spillage immediately from paint work, with clean water. CAUTION: Make sure the brake pads are installed to the correct orientation. CAUTION: Make sure the brake pads are fitted with the direction arrow following the direction of wheel rotation. CAUTION: Note condition of pins and ‘R’ clips and replace if necessary.