🔧 4Runner - Front Brake Pad and Rotor Replacement

This repair replaces the front brake pads and both front rotors on your 4Runner. The four-piston front calipers are reused and must be supported carefully so the brake hoses are not damaged.

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

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⚠️ Safety & Precautions

• ⚠️ Replace front pads and rotors on both sides to maintain even braking.
• ⚠️ Support your 4Runner with jack stands. Never work beneath a vehicle supported only by a jack.
• ⚠️ Do not inhale brake dust or blow it away with compressed air. Use brake cleaner.
• ⚠️ Never allow a caliper to hang from its rubber brake hose.
• ⚠️ Do not press the brake pedal while a caliper is removed.
• ⚠️ Brake fluid damages paint. Clean spills immediately with water.
• ⚠️ The battery does not need to be disconnected for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3-ton floor jack
• 3-ton jack stands
• Wheel chocks
• 21mm deep socket
• 19mm socket
• 1/2-inch drive breaker bar
• 1/2-inch drive ratchet
• 1/2-inch drive torque wrench rated 30-150 ft-lbs
• Four-piston brake caliper spreader (specialty)
• Needle-nose pliers
• 3mm pin punch
• 16-ounce ball-peen hammer
• M8 x 1.25 rotor removal bolts (specialty)
• Flat-blade screwdriver
• Brake-fluid extractor (specialty)
• Brake rotor micrometer rated 0-50mm
• Wheel-hub wire brush
• Caliper support hook
• Drain pan
• Nitrile mechanic 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 rotors - Replace in pairs - Qty: 2
• Front brake pad fitting hardware kit - Qty: 1
• Front brake pad anti-squeal shim kit - Qty: 1
• High-temperature silicone brake lubricant - Qty: 1
• Non-chlorinated brake cleaner - Qty: 2 cans
• DOT 3 brake fluid - Qty: 1 pint

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📋 Before You Begin

• 📋 Park your 4Runner on firm, level ground. Shift into Park, apply the parking brake, and switch off the ignition.
• 📋 Place wheel chocks securely behind both rear tires.
• 📋 Open the hood and locate the brake-fluid reservoir. Clean around its cap before opening it.
• 📋 If the fluid is at the MAX line, use the brake-fluid extractor to remove a small amount. Pushing the caliper pistons inward raises the fluid level.
• 📋 No infotainment service mode, scan tool, or battery disconnect is required.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Front Wheel Nuts

• Use the 21mm deep socket and breaker bar to loosen each front lug nut about one-half turn.
• Do not remove the lug nuts while your 4Runner is still on the ground.

Step 2: Raise and Support the Front End

• Position the 3-ton floor jack beneath the front crossmember and raise the front of your 4Runner.
• Place the 3-ton jack stands beneath the approved left and right frame support points.
• Lower your 4Runner onto the stands, then gently test that it is stable.

Step 3: Remove Both Front Wheels

• Use the 21mm deep socket and ratchet to remove the lug nuts.
• Remove both front wheels and place them flat away from the work area.

Step 4: Remove the Brake Pad Retaining Hardware

• Work on one side at a time so the assembled side remains a reference.
• Place the drain pan below the brake assembly, then clean the caliper with non-chlorinated brake cleaner.
• Use needle-nose pliers to remove the small retaining clips from the ends of the two pad pins.
• Hold the anti-rattle spring while using the 3mm pin punch and ball-peen hammer to tap out both pad pins.
• Remove the anti-rattle spring and note its installed direction.
• Take a photo before removing the hardware.

Step 5: Retract the Four Caliper Pistons

• Use the four-piston brake caliper spreader to press the pads outward gently, which pushes the pistons evenly into the caliper.
• A caliper spreader is a tool that presses the caliper pistons inward without twisting or damaging them.
• Watch the brake-fluid reservoir and use the brake-fluid extractor if the level approaches the top.
• Stop if a piston is seized, a dust boot is torn, or brake fluid leaks from the caliper.

Step 6: Remove the Old Brake Pads

• Pull both pads and their shims out through the rear opening of the caliper.
• Use the flat-blade screwdriver only for gentle assistance if a pad is stuck. Do not damage the piston boots.
• Inspect the old pads. Strongly tapered or uneven wear can indicate a sticking piston or damaged hardware.

Step 7: Remove and Support the Caliper

• Use the 19mm socket and breaker bar to remove the two caliper mounting bolts from the back of the steering knuckle.
• Lift the complete caliper from the rotor without pulling or twisting the brake hose.
• Support the caliper from the suspension with the caliper support hook.
• Do not disconnect the brake hose. The hydraulic system should remain sealed.

Step 8: Remove the Old Rotor

• Pull the rotor straight off the hub.
• If corrosion holds it in place, thread the two M8 x 1.25 rotor removal bolts evenly into the rotor's threaded extraction holes.
• Use the 1/2-inch drive ratchet to alternate between the two bolts until the rotor releases. Do not tighten one bolt fully before the other.

Step 9: Clean and Inspect the Hub

• Use the wheel-hub wire brush to remove rust and debris from the hub face.
• Wipe the hub clean with brake cleaner and confirm that no raised rust remains. The new rotor must sit completely flat.
• Use the rotor micrometer to check the removed rotor if desired. Toyota's front rotor discard thickness is approximately 29.0mm; replace any rotor at or below the marked minimum specification.
• A clean hub helps prevent brake-pedal vibration.

Step 10: Install the New Rotor

• Use brake cleaner and nitrile mechanic gloves to remove protective oil from both friction surfaces of the new rotor.
• Slide the rotor fully onto the clean hub.
• Temporarily install two lug nuts by hand to hold the rotor flat while the caliper is installed.

Step 11: Reinstall the Caliper

• Position the caliper over the new rotor without twisting the brake hose.
• Install the two caliper mounting bolts by hand to avoid cross-threading.
• Use the 19mm socket and torque wrench to tighten both mounting bolts to 123 Nm (91 ft-lbs).

Step 12: Prepare and Install the New Pads

• Fit the new anti-squeal shims to the new pads in the same arrangement as the original parts.
• Apply a thin film of high-temperature silicone brake lubricant to the pad ears and shim contact areas only.
• Keep lubricant completely off the rotor, pad friction material, piston boots, and pad faces.
• Slide the inner and outer pads fully into the caliper.

Step 13: Install the Pad Pins and Spring

• Position the new anti-rattle spring in its original direction.
• Insert both pad pins through the caliper, pads, and spring.
• Use the 3mm pin punch and ball-peen hammer to seat the pins gently.
• Use needle-nose pliers to install the retaining clips securely in the pad-pin holes.
• Confirm that both pads can move slightly and all retaining hardware is fully seated.

Step 14: Repeat on the Other Side

• Use the same tools and steps to replace the opposite front rotor and brake pads.
• Confirm both caliper mounting bolts are tightened to 123 Nm (91 ft-lbs) on each side.

Step 15: Reinstall the Front Wheels

• Remove any temporary lug nuts, then install each wheel.
• Thread all lug nuts by hand before using the 21mm deep socket and ratchet to snug them in a star pattern.
• Raise your 4Runner slightly with the 3-ton floor jack, remove the jack stands, and lower the tires to the ground.
• Use the 21mm deep socket and torque wrench to tighten the lug nuts in a star pattern to 113 Nm (83 ft-lbs).

Step 16: Restore Brake Pedal Pressure

• Before starting the engine, press the brake pedal slowly several times until it becomes firm.
• Do not move your 4Runner until a firm pedal is obtained.
• Check the brake-fluid reservoir and add fresh DOT 3 brake fluid only if the level is below MAX.
• Install the reservoir cap securely.

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✅ After Repair

• ✅ Start the engine and hold firm pressure on the brake pedal. The pedal should remain steady rather than sinking toward the floor.
• ✅ Inspect both front calipers and brake hoses for leaks or twisted hoses.
• ✅ At very low speed, test the brakes in a safe, traffic-free area before normal driving.
• ✅ Bed in the pads with 8-10 moderate stops from approximately 50 km/h to 15 km/h. Do not come to a complete stop between applications.
• ✅ Drive for several minutes afterward with minimal braking to cool the brakes. Avoid hard braking or holding the hot brakes at a stop for about 300 km.
• ✅ Recheck the brake-fluid level and wheel lug torque after the road test.
• ✅ If the pedal remains soft, braking pulls to one side, or warning lights appear, stop driving and inspect the work.

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💰 DIY vs Shop Cost

Shop Cost: ₹35,000-₹70,000 (parts + labor)

DIY Cost: ₹20,000-₹50,000 (parts only)

You Save: ₹10,000-₹25,000 by doing it yourself!

Local labor and imported US-market parts pricing vary. This repair takes a shop approximately 2-3 hours.

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