🔧 Prius - Front Brake Pad Replacement

You’ll remove the front wheels, swing the front brake calipers up, compress the pistons, and install new pads. On your Prius, it’s extra important to keep the car fully OFF so the electric brake system doesn’t try to pressurize itself while parts are removed.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and support the car with jack stands—never rely on a floor jack alone.
• ⚠️ Hybrid safety: keep the car OFF, keep the key fob away from the car, and do not put the car in READY during the job.
• ⚠️ Do not press the brake pedal while a caliper is removed (the piston can pop out and leak fluid).
• ⚠️ Avoid opening/closing doors or turning ignition on while calipers are off; this can wake the brake system.
• ⚠️ Recommended: disconnect the 12V battery negative terminal before starting to reduce the chance the brake actuator runs.
• ⚠️ Brake dust is harmful—use brake cleaner, not compressed air.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (2-ton minimum, pair)
• Wheel chocks
• 21mm socket
• 14mm socket
• 3/8" drive ratchet
• Breaker bar (1/2" drive)
• Torque wrench (10-150 ft-lbs range)
• C-clamp (6" minimum)
• Flathead screwdriver
• Bungee cord
• Wire brush
• 10mm wrench
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front brake pad set - Qty: 1
• Front brake pad hardware kit (clips) - Qty: 1
• Brake caliper grease (silicone) - Qty: 1
• Brake cleaner - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Chock the rear wheels using wheel chocks.
• Turn the car OFF and keep the key fob at least 15 feet away.
• Open the hood and disconnect the 12V battery negative terminal using a 10mm wrench. (The 12V battery powers control modules; disconnecting helps prevent the brake system from activating.)
• Lay out pads and hardware before lifting.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen lug nuts

• Use a 21mm socket and breaker bar to loosen the front lug nuts about 1/2 turn while the tires are still on the ground.

Step 2: Lift and support the front end

• Lift the front of the car with a floor jack (rated 3-ton minimum).
• Set the car securely on jack stands (2-ton minimum, pair) at proper front support points.
• Give the car a firm push to confirm it’s stable before working.

Step 3: Remove the front wheels

• Remove the lug nuts using a 21mm socket and 3/8" drive ratchet.
• Remove both front wheels and slide them under the car as an extra safety backup.

Step 4: Access the caliper and inspect

• Turn the steering wheel by hand to give yourself room (left side: turn wheel right; right side: turn wheel left).
• Look at the rotor surface and brake hose for leaks or damage.

Step 5: Remove the lower caliper slide-pin bolt

• Use a 14mm socket and 3/8" drive ratchet to remove the lower caliper slide-pin bolt.
• Keep the bolt clean; set it aside where it won’t get dirt on it.

Step 6: Swing the caliper up and support it

• Swing the caliper upward like a hinge (it pivots on the top slide pin).
• Support the caliper using a bungee cord so it’s not hanging by the brake hose.
• Never let the caliper dangle by the hose.

Step 7: Remove old pads and hardware

• Remove the inner and outer pads by hand. If stuck, gently pry using a flathead screwdriver.
• Remove the stainless pad clips (hardware) from the bracket.
• Clean the bracket pad lands (where pads slide) using a wire brush.

Step 8: Compress the caliper piston

• Position an old pad against the piston face (to spread pressure evenly).
• Use a C-clamp (6" minimum) to slowly compress the piston fully back into the caliper.
• Go slowly and smoothly. If it fights hard, stop and re-check that everything is aligned.

Step 9: Install new hardware clips and apply brake grease

• Install the new clips from the hardware kit onto the bracket.
• Apply a thin film of brake caliper grease (silicone) where the pad ears slide on the clips.
• Do not get grease on pad friction material or rotor.

Step 10: Install the new pads

• Install the new inner and outer pads into the bracket by hand.
• Make sure the pads slide freely. If they bind, re-clean the pad lands with the wire brush and re-seat the clips.

Step 11: Reinstall the caliper

• Swing the caliper back down over the new pads.
• Install the lower slide-pin bolt by hand first to avoid cross-threading.
• Tighten using a 14mm socket and torque wrench: Torque to 34 Nm (25 ft-lbs).

Step 12: Repeat on the other side

• Repeat Steps 4 through 11 on the other front wheel.
• Always replace pads on both sides.

Step 13: Reinstall wheels and torque lug nuts

• Reinstall the wheels and hand-thread all lug nuts.
• Snug lug nuts in a star pattern using a 21mm socket.
• Lower the car off the jack stands using the floor jack.
• Final-tighten lug nuts with a torque wrench: Torque to 103 Nm (76 ft-lbs).

Step 14: Reconnect the 12V battery

• Reconnect the 12V negative terminal using a 10mm wrench.

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✅ After Repair

• Before starting the car, pump the brake pedal slowly 8–12 times until it feels firm (this seats the pistons against the new pads).
• Start the car and confirm no brake warning lights stay on.
• Do a cautious test drive: confirm normal braking at low speed first.
• Pad break-in: make 6–10 moderate stops from ~30 mph down to ~5 mph, with cool-down time between stops. Avoid hard panic stops for the first 200 miles unless needed for safety.
• Recheck lug nut torque after 25–50 miles using a torque wrench: Torque to 103 Nm (76 ft-lbs).

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $60-$180 (parts only)

You Save: $190-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 hours.

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🎯 Ready to get started?

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