🔧 Prius - Rear Brake Pad Replacement

Replacing the rear brake pads on your Prius requires retracting both caliper pistons, installing the new pads, and carefully reactivating the electronically controlled brake system. The hybrid brake actuator can pressurize unexpectedly, so the 12-volt battery must be disconnected before touching the calipers.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Keep hands and tools away from all orange high-voltage cables. This repair does not require opening the hybrid system.
• ⚠️ Disconnect the 12-volt battery before removing a caliper. Opening a door or pressing the brake pedal can otherwise activate the brake actuator.
• ⚠️ Never press the brake pedal while a caliper is removed.
• ⚠️ Support your Prius with jack stands. Never work beneath a vehicle supported only by a floor jack.
• ⚠️ Do one side at a time so the assembled side remains available as a reference.
• ⚠️ Do not let a caliper hang from its rubber brake hose.
• ⚠️ Brake dust may be harmful. Do not use compressed air to clean it.

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🔧 Required Tools

You'll need the following tools for this repair:

• 21mm deep socket
• 14mm socket
• 10mm wrench
• 3/8-inch drive ratchet
• 3/8-inch drive breaker bar
• 3/8-inch drive torque wrench rated 10-150 Nm
• Rear brake caliper piston compression tool (specialty)
• Plastic trim removal tool
• Small flat-blade screwdriver
• Brake fluid syringe
• Nylon brake cleaning brush
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Rubber wheel chocks
• Caliper support hook
• Nitrile mechanic gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear brake pad set - Qty: 1
• Rear brake pad fitting hardware kit - Qty: 1
• Rear brake pad wear indicators - Qty: 2
• High-temperature silicone brake grease - Qty: 1
• Non-chlorinated brake cleaner - Qty: 1
• Toyota DOT 3 brake fluid - Qty: 1 small bottle

Replace the rear pads on both sides as a complete axle set.

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📋 Before You Begin

• Park your Prius on firm, level ground. Shift to Park, apply the parking brake, and switch the vehicle completely off.
• Open the hood and inspect the brake-fluid level. If it is near the MAX line, use the brake fluid syringe to remove a small amount before compressing the pistons.
• Keep the driver’s door open and lower a window before disconnecting power. Do not press the brake pedal afterward.
• Use the 10mm wrench to disconnect the negative terminal from the 12-volt battery. Isolate the cable so it cannot spring back onto the terminal.
• Wait at least two minutes before working on the brakes. This allows stored brake-system pressure to settle.
• No infotainment setting, electronic parking-brake service mode, or high-voltage isolation is required for this configuration.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Secure and Raise the Rear

• Use the rubber wheel chocks to block both sides of the front wheels.
• Release the parking brake after the front wheels are securely chocked. The rear calipers must be free from parking-brake tension.
• Use the 21mm deep socket and breaker bar to loosen each rear wheel nut approximately one-quarter turn.
• Use the floor jack at the rear center lifting point, then place the jack stands beneath the two rear side support points.
• Lower your Prius gently onto the jack stands and verify that it is stable.

Step 2: Remove the Rear Wheels

• Use the 21mm deep socket and ratchet to remove the five nuts from each rear wheel.
• Remove both wheels and slide them beneath the side sills as an additional safety measure.

Step 3: Inspect the Brake Assembly

• Use the non-chlorinated brake cleaner and nylon brake cleaning brush to remove loose dust.
• Check each rotor for deep grooves, cracks, heavy rust, or a pronounced outer lip.
• Check the caliper boots and brake hoses for splits, wetness, or fluid leakage. Stop the repair if a hydraulic leak is present.
• Use a small flat-blade screwdriver only as a visual pointer to note the position of the wear indicator and pad hardware before disassembly.

Step 4: Remove the Caliper

• Use the 14mm socket and ratchet to remove the lower caliper slide-pin bolt.
• Pivot the caliper upward. If clearance is limited, use the 14mm socket to remove the upper slide-pin bolt as well.
• Use the caliper support hook to support the caliper from the suspension. Do not pull, twist, or stretch the brake hose.
• Photograph the pad positions before removal.

Step 5: Remove the Old Pads and Hardware

• Use gloved hands to slide the inner and outer pads out of the caliper bracket.
• Use the small flat-blade screwdriver to carefully lift the stainless pad-support hardware from the bracket.
• Use the brake cleaner and nylon brake cleaning brush to clean the pad contact surfaces.
• Do not scratch the rubber slide-pin boots with the screwdriver.

Step 6: Retract the Caliper Piston

• Place an old brake pad against the piston, then use the rear brake caliper piston compression tool to press the piston slowly and evenly into the caliper.
• This configuration uses a straight compression action. Do not force the piston to rotate.
• Watch the brake-fluid reservoir while compressing the piston. Use the brake fluid syringe if the level approaches the top.
• Stop if the piston binds, tilts, or requires excessive force. A seized caliper must be repaired or replaced.

Step 7: Install the New Hardware and Pads

• Use gloved hands to snap the new pad-support hardware completely into the caliper bracket.
• Apply a very thin film of high-temperature silicone brake grease to the pad ears where they contact the hardware.
• Keep grease completely off the rotor, pad friction surfaces, and rubber piston boot.
• Install the new inner and outer pads by hand. Position the wear indicators the same way as the original Toyota pads.
• Confirm that both pads slide freely in the bracket without excessive looseness.

Step 8: Reinstall the Caliper

• Use your fingers to confirm that both slide pins move smoothly and that their rubber boots are seated.
• Swing the caliper over the new pads without twisting the brake hose.
• Start each slide-pin bolt by hand to prevent cross-threading.
• Use the 14mm socket and torque wrench to tighten the rear caliper slide-pin bolts to 34 Nm (25 ft-lbs).

Step 9: Repeat on the Opposite Side

• Use the same 14mm socket, piston compression tool, and cleaning tools to replace the pads on the other rear brake.
• Use the torque wrench to tighten that side’s slide-pin bolts to 34 Nm (25 ft-lbs).
• Verify that both brake hoses are untwisted and all rubber boots are properly seated.

Step 10: Reinstall the Wheels

• Use gloved hands to install each wheel and start all five nuts by hand.
• Use the 21mm deep socket and ratchet to snug the nuts in a star pattern.
• Use the floor jack to raise your Prius slightly, remove the jack stands, and lower the vehicle completely.
• Use the 21mm deep socket and torque wrench to tighten the wheel nuts in a star pattern to 103 Nm (76 ft-lbs).

Step 11: Restore Brake-System Power

• Use the 10mm wrench to reconnect and securely tighten the negative 12-volt battery terminal.
• Do not switch your Prius to READY yet.
• Press and release the brake pedal slowly several times until it feels firm. This seats the pistons and pads against the rotors.
• Apply and release the parking brake several times to confirm normal operation.

Step 12: Check the Brake Fluid

• Inspect the brake-fluid reservoir visually and confirm the level is between MIN and MAX.
• If needed, add only fresh Toyota DOT 3 brake fluid from a sealed container.
• Use brake cleaner and the nylon brush to remove any accidental contamination before driving.

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✅ After Repair

• ✅ Switch your Prius to READY and confirm that the red brake, ABS, and slip-indicator lights turn off normally.
• ✅ Keep your foot on the brake and shift between Park, Reverse, and Drive before moving. The pedal must remain firm.
• ✅ Test the brakes at walking speed in a safe, traffic-free area.
• ✅ Perform several gentle stops from approximately 30 mph, allowing time between stops for cooling. Avoid hard braking for the first 150-200 miles unless required for safety.
• ✅ Recheck the brake-fluid level and inspect both rear calipers for leaks after the road test.
• ✅ Recheck wheel-nut torque to 103 Nm (76 ft-lbs) after approximately 50 miles.
• ✅ If warning lights remain on, the pedal feels soft, or braking is uneven, do not continue driving. Have the electronically controlled brake system scanned for faults.

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💰 DIY vs Shop Cost

Shop Cost: ₹10,000-₹20,000 (parts + labor)

DIY Cost: ₹4,000-₹9,000 (parts only)

You Save: ₹6,000-₹11,000 by doing it yourself!

Local labor rates vary. This repair takes a shop approximately 1-1.5 hours.

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