🔧 Mustang - Rear Brake Pad & Rotor Replacement

This repair replaces the rear brake pads and rear brake rotors on your Mustang. Rear brakes wear down over time, and replacing pads and rotors together helps restore smooth, quiet braking.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool brake system. Hot rotors and calipers can burn you.
• ⚠️ Use jack stands every time. Never rely on a floor jack alone.
• ⚠️ Your Mustang uses a mechanical rear parking brake at the caliper. Make sure the parking brake is fully released before starting.
• ⚠️ Do not press the brake pedal while a rear caliper is removed.
• ⚠️ Brake dust is harmful. Wear safety glasses and a dust mask, and avoid blowing dust with compressed air.
• ⚠️ Battery disconnect is not required for this rear brake service.

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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
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench
• 3/8-inch drive torque wrench
• 21mm impact socket
• 13mm socket
• 15mm socket
• 18mm socket
• 3/8-inch drive ratchet
• 1/2-inch drive ratchet
• Rear brake caliper wind-back tool (specialty)
• Flat-blade screwdriver
• Small wire brush
• Brake cleaner spray
• Catch pan
• Bungee cord
• Rubber mallet
• C-clamp
• Safety glasses
• Nitrile gloves
• Dust mask

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear brake pad set - Qty: 1
• Rear brake rotors - Qty: 2
• Rear brake hardware kit - Qty: 1
• Brake caliper slide pin grease - Qty: 1
• Brake cleaner spray - Qty: 1-2 cans

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📋 Before You Begin

• Park your Mustang on level ground.
• Put the transmission in 1st gear.
• Fully release the parking brake.
• Place wheel chocks in front of both front tires.
• Open the hood and check the brake fluid reservoir. If it is near the MAX line, remove a small amount with a clean suction tool before compressing the calipers.
• A rear brake caliper wind-back tool is a tool that pushes and turns the caliper piston at the same time. This is needed because the parking brake mechanism is built into the rear caliper.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Rear Lug Nuts

• Use a 21mm impact socket and 1/2-inch drive breaker bar to loosen each rear wheel lug nut about 1/2 turn.
• Do not remove the lug nuts yet.
• Loosen wheels before lifting.

Step 2: Raise and Support the Rear of the Car

• Use a floor jack to lift the rear of your Mustang at a proper rear jacking point.
• Place jack stands under the approved rear support points.
• Lower the car gently onto the jack stands.
• Lightly shake the car by hand to make sure it is stable before working underneath or near the wheels.

Step 3: Remove the Rear Wheels

• Use the 21mm impact socket and 1/2-inch drive ratchet to remove the rear lug nuts.
• Remove both rear wheels and set them flat on the ground.

Step 4: Inspect the Brake Layout

• Look at the rear caliper, pads, rotor, brake hose, and parking brake cable before disassembly.
• Use a flat-blade screwdriver only for light prying if needed. Do not damage the brake hose or parking brake cable.
• Take a phone photo before removing parts if this is your first brake job.

Step 5: Remove the Rear Caliper

• Use a 13mm socket and 3/8-inch drive ratchet to remove the two rear caliper slide pin bolts.
• Slide the caliper off the rotor.
• Use a bungee cord to hang the caliper from the suspension.
• Do not let the caliper hang by the rubber brake hose.

Step 6: Remove the Old Brake Pads

• Pull the old inner and outer brake pads out of the caliper bracket by hand.
• Use a flat-blade screwdriver gently if the pads are stuck.
• Notice how the pad wear indicator is positioned so the new pads go in correctly.

Step 7: Remove the Caliper Bracket

• Use an 18mm socket and 1/2-inch drive breaker bar to remove the two rear caliper bracket bolts.
• Remove the caliper bracket from the knuckle.
• Set the bracket on a clean work surface.

Step 8: Remove the Rear Rotor

• Pull the rear rotor straight off the hub by hand.
• If the rotor is stuck, tap the rotor hat area with a rubber mallet.
• Do not hit the wheel studs.
• If the rotor will not come off, confirm the parking brake is fully released.

Step 9: Clean the Hub Face

• Use a small wire brush to clean rust and debris from the wheel hub face.
• Use brake cleaner spray and a catch pan to wash away loose debris.
• The new rotor must sit flat against the hub to prevent brake vibration.
• Clean hub equals smooth braking.

Step 10: Install the New Rear Rotor

• Clean both sides of the new rotor friction surface with brake cleaner spray.
• Slide the new rotor onto the hub by hand.
• Thread one lug nut on backward by hand to hold the rotor in place while you work.

Step 11: Service the Caliper Bracket

• Use a flat-blade screwdriver to remove the old pad hardware clips from the caliper bracket.
• Use a small wire brush to clean the bracket where the clips sit.
• Install the new rear brake hardware clips by hand.
• Remove the slide pins from the bracket by hand.
• Wipe the pins clean with a shop towel and apply a thin coat of brake caliper slide pin grease.
• Reinstall the slide pins by hand and make sure they move smoothly.

Step 12: Reinstall the Caliper Bracket

• Position the caliper bracket over the new rotor.
• Start both bracket bolts by hand to avoid cross-threading.
• Use an 18mm socket and 1/2-inch drive torque wrench to tighten the rear caliper bracket bolts.
• Torque to 115 Nm (85 ft-lbs)

Step 13: Wind Back the Rear Caliper Piston

• Use the rear brake caliper wind-back tool to push and rotate the rear caliper piston clockwise until it is fully seated.
• Watch the brake fluid reservoir while doing this. Fluid level may rise.
• Make sure the piston boot does not twist or tear.
• Do not use only a C-clamp on this rear caliper. It must rotate while being pushed in.

Step 14: Install the New Rear Brake Pads

• Install the new inner and outer pads into the caliper bracket by hand.
• Make sure the pad friction material faces the rotor.
• The pads should slide smoothly in the new hardware clips.
• If a pad is tight, remove it and clean the bracket contact area again with the small wire brush.

Step 15: Reinstall the Rear Caliper

• Remove the caliper from the bungee cord.
• Slide the caliper over the new brake pads and rotor.
• Start both caliper slide pin bolts by hand.
• Use a 13mm socket and 3/8-inch drive torque wrench to tighten the caliper slide pin bolts.
• Torque to 35 Nm (26 ft-lbs)

Step 16: Repeat on the Other Side

• Repeat Steps 4 through 15 on the opposite rear brake.
• Rear brake pads and rotors should always be replaced in pairs.

Step 17: Reinstall the Rear Wheels

• Remove the temporary lug nut holding each rotor.
• Install the rear wheels by hand.
• Start all lug nuts by hand to avoid cross-threading.
• Use a 21mm impact socket and 1/2-inch drive ratchet to snug the lug nuts in a star pattern.

Step 18: Lower the Car and Torque the Lug Nuts

• Use the floor jack to lift the rear slightly and remove the jack stands.
• Lower the car until the tires touch the ground.
• Use a 21mm impact socket and 1/2-inch drive torque wrench to tighten the rear lug nuts in a star pattern.
• Torque to 204 Nm (150 ft-lbs)

Step 19: Pump the Brake Pedal

• Sit in the driver seat and press the brake pedal slowly several times until it feels firm.
• This moves the caliper pistons back against the new pads.
• Do not drive until the brake pedal feels firm.

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✅ After Repair

• Check the brake fluid reservoir and adjust the level if needed.
• Start your Mustang and press the brake pedal again. It should feel firm, not soft or sinking.
• Test the parking brake before driving normally.
• Drive slowly in a safe area and make several gentle stops.
• Bed in the new pads if the pad manufacturer requires it. A common method is 8-10 moderate stops from about 35-40 mph, letting brakes cool between stops.
• Avoid hard braking for the first 200 miles unless needed for safety.
• Recheck lug nut torque after the first short drive: Torque to 204 Nm (150 ft-lbs)

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💰 DIY vs Shop Cost

Shop Cost: $450-$750 (parts + labor)

DIY Cost: $180-$350 (parts only)

You Save: $270-$400 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.0 hours.

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🎯 Ready to get started?

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