🔧 Sienna - Front Brake Pads & Rotor Replacement

You’ll be removing the front calipers (the clamp that squeezes the brake pads) to replace the pads and the rotors (the metal discs the pads grab). This is a straightforward DIY, but clean work and correct torque are critical for quiet, safe braking.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and use jack stands—never rely on a jack alone.
• ⚠️ Brake dust is harmful—use brake cleaner, don’t blow dust with air.
• ⚠️ Do not press the brake pedal with the caliper removed.
• ⚠️ Brake parts can be hot—let them cool before starting.
• ⚠️ Keep grease/oil off pad friction material and rotor surfaces.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• 21mm socket
• 14mm socket
• 17mm socket
• Breaker bar (1/2")
• Torque wrench (20–150 ft-lbs range)
• Ratchet (3/8" or 1/2")
• Flathead screwdriver
• C-clamp (6" or larger)
• Wire brush
• Bungee cord
• Brake cleaner spray
• Shop rags
• Nitrile gloves
• Safety glasses
• M8 x 1.25 bolts (about 25–35mm long)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front brake pad set - Qty: 1
• Front brake rotors - Replace in pairs - Qty: 2
• Front pad hardware/clip kit - Qty: 1
• Brake caliper grease (silicone brake grease) - Qty: 1
• Brake parts cleaner - Qty: 1
• Brake fluid (DOT 3) - Qty: 1 bottle

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📋 Before You Begin

• Park on level ground, shift to Park, and apply the parking brake.
• Place wheel chocks behind both rear tires.
• Crack the front lug nuts loose about 1/4 turn using a 21mm socket and breaker bar before lifting.
• Open the hood and check the brake fluid reservoir level; you may need to remove a little fluid if it’s already near MAX.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the front

• Use a floor jack to lift the front jacking point, then support with jack stands at the proper support points.
• Remove the front wheels using a 21mm socket.

Step 2: Remove the caliper (save the brake hose)

• Turn the steering wheel to give yourself space (left for right side work, right for left side work).
• Remove the two caliper slide bolts using a 14mm socket.
• Lift the caliper off and hang it from the strut spring using a bungee cord (do not let it hang by the brake hose).
• Hanging caliper prevents hose damage.

Step 3: Remove pads and hardware

• Slide the old pads out by hand; use a flathead screwdriver gently if they’re stuck.
• Remove the old pad clips/hardware from the bracket.
• Clean the bracket pad “tracks” (where the clips sit) with a wire brush and brake cleaner spray.

Step 4: Remove the caliper bracket

• Remove the two caliper bracket bolts using a 17mm socket and breaker bar.
• Set the bracket aside on a rag.
• Torque to 123 Nm (91 ft-lbs) when reinstalling.

Step 5: Remove the rotor

• Pull the rotor straight off the hub.
• If it’s stuck: thread two M8 x 1.25 bolts into the rotor’s “push-off” holes and tighten evenly with a ratchet until the rotor pops loose.
• Clean the hub face with a wire brush and brake cleaner spray so the new rotor sits flat.

Step 6: Install new rotors

• Clean both sides of the new rotor with brake cleaner spray and shop rags (removes protective oil).
• Install the rotor onto the hub.
• If the rotor wants to wobble, hand-thread one lug nut to hold it in place (use your fingers; remove it before the wheel goes on).

Step 7: Reinstall bracket and new hardware

• Install the new pad clips/hardware onto the bracket.
• Reinstall the bracket using a 17mm socket and torque wrench.
• Torque to 123 Nm (91 ft-lbs).

Step 8: Compress the caliper piston

• The piston is the round “plunger” that pushes the pads; it must be pushed back in to fit the thicker new pads.
• Place an old pad against the piston face, then slowly compress using a C-clamp.
• Go slowly and watch the brake fluid reservoir level under the hood.

Step 9: Install new pads (grease only the correct spots)

• Apply a thin layer of brake caliper grease to the pad ears (the ends that slide in the clips).
• If your pad set includes shims, install them as supplied with the pads.
• Slide the new pads into the bracket by hand.
• Do not get grease on the pad friction surface.

Step 10: Reinstall the caliper

• Lower the caliper over the new pads.
• Install the two caliper slide bolts using a 14mm socket, then tighten with a torque wrench.
• Torque to 34 Nm (25 ft-lbs).

Step 11: Reinstall wheels

• Put the wheels back on and hand-thread all lug nuts.
• Lower the vehicle off the jack stands using the floor jack.
• Tighten lug nuts in a star pattern using a torque wrench.
• Torque to 103 Nm (76 ft-lbs).

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✅ After Repair

• Before moving: pump the brake pedal 8–12 times until it feels firm (this seats the pistons against the new pads).
• Check brake fluid level and top off with DOT 3 if needed.
• With the engine running, hold the brake pedal for 20 seconds; confirm it stays firm.
• Test drive at low speed first, listening for grinding or pulling.
• Pad bedding (recommended): do 6–8 medium stops from ~40 mph to ~10 mph, with 30–60 seconds between stops to cool.

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $180-$450 (parts only)

You Save: $270-$450 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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