🔧 Mustang - Rear Brake Pad & Rotor Replacement

This repair replaces the rear brake pads and rear brake rotors on your Mustang. Rear brake pads squeeze the rotors to slow the car, and worn pads or warped rotors can cause noise, vibration, longer stopping distance, or poor braking feel.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a flat, solid surface and support your Mustang with jack stands. Never rely on a jack alone.
• ⚠️ Do not press the brake pedal while a rear caliper is removed.
• ⚠️ Brake dust can be harmful. Do not blow it with compressed air; use brake cleaner and a rag.
• ⚠️ Rear caliper pistons on your Mustang must be rotated while pushed in. A piston rewind tool turns and compresses the piston at the same time.
• ⚠️ Keep brake fluid off paint. It can damage painted surfaces quickly.
• ⚠️ Replace rear pads and rotors on both sides together so braking stays even.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench
• 3/8-inch drive ratchet
• 13mm socket
• 15mm socket
• 19mm socket
• 6mm hex socket
• Rear brake caliper piston rewind tool (specialty)
• Flat-blade screwdriver
• Wire brush
• Small bungee cord
• Brake cleaner
• Shop rags
• Brake caliper hanger hook

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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 - Replace in pairs - Qty: 2
• Rear brake hardware kit - Qty: 1
• Brake lubricant - Qty: 1
• Brake cleaner - Qty: 1-2 cans
• DOT 4 brake fluid - Qty: 1 small bottle

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📋 Before You Begin

• 🅿️ Park your Mustang on level ground.
• 🛞 Put wheel chocks in front of the front tires.
• 🔓 Leave the parking brake released before lifting the rear of the car.
• 🔧 Put the manual transmission in 1st gear only after the rear wheels are secured and chocked.
• 🧴 Open the hood and check the brake fluid reservoir. If it is completely full, remove a small amount with a clean tool so it does not overflow when the pistons are pushed back.
• 📌 A caliper is the clamp-shaped brake part that holds the pads and squeezes the rotor.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Rear Wheel Lug Nuts

• Use a 19mm socket and 1/2-inch drive breaker bar to loosen each rear lug nut about half a turn.
• Do this while the tires are still touching the ground so the wheels do not spin.
• Break loose, do not remove.

Step 2: Lift and Support the Rear of the Car

• Use a floor jack at the rear jacking point to raise the rear of your Mustang.
• Place jack stands under the approved rear support points.
• Gently lower the car onto the jack stands and lightly shake the car to confirm it is stable.
• Keep the floor jack nearby as a backup, but do not use it as the only support.

Step 3: Remove the Rear Wheels

• Use a 19mm socket to remove the loosened lug nuts.
• Remove both rear wheels and place them flat under the side of the car as an extra safety backup.

Step 4: Inspect the Brake Assembly

• Put on safety glasses and nitrile gloves.
• Look at the brake hose, caliper, pads, and rotor before taking anything apart.
• Use brake cleaner and shop rags to clean heavy dust from the area.
• Do not spray brake cleaner on hot parts.

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 carefully.
• Hang the caliper from the suspension using a brake caliper hanger hook or small bungee cord.
• Do not let the caliper hang by the rubber brake hose.

Step 6: Remove the Old Brake Pads and Hardware

• Use a flat-blade screwdriver to gently pry the old brake pads out of the caliper bracket.
• Remove the old pad clips from the bracket by hand or with the flat-blade screwdriver.
• The pad clips are thin metal guides that let the pads slide smoothly.
• Remember the direction of the old pads and clips before removing them.

Step 7: Remove the Rear Caliper Bracket

• Use a 15mm socket and 3/8-inch drive ratchet to remove the two rear caliper bracket bolts.
• If the bolts are tight, use the 1/2-inch drive breaker bar carefully for extra leverage.
• Remove the caliper bracket and set it aside.

Step 8: Remove the Rear Rotor

• Check the face of the rotor for a small retaining screw.
• If equipped, use a 6mm hex socket and 3/8-inch drive ratchet to remove the rotor retaining screw.
• Pull the rotor straight off the hub.
• If it is stuck, tap around the rotor hat with controlled force using the handle end of a tool. Do not hit the wheel studs.
• Rust can hold rotors tight.

Step 9: Clean the Hub Surface

• Use a wire brush to clean rust and debris from the wheel hub face.
• Wipe the surface with brake cleaner and a shop rag.
• This helps the new rotor sit flat and reduces brake vibration.

Step 10: Install the New Rear Rotor

• Clean both sides of the new rotor with brake cleaner and a shop rag.
• Slide the new rotor onto the hub.
• If equipped with a rotor retaining screw, install it using a 6mm hex socket.
• Torque rotor retaining screw to 10 Nm (89 in-lbs).
• If there is no retaining screw, hold the rotor in place with one lug nut installed finger-tight using the 19mm socket.

Step 11: Prepare the Caliper Bracket

• Use a wire brush to clean the pad contact areas on the caliper bracket.
• Install the new rear brake hardware clips by hand.
• Apply a thin film of brake lubricant only where the pads touch the clips.
• Do not get lubricant on the pad friction material or rotor surface.

Step 12: Reinstall the Caliper Bracket

• Place the caliper bracket over the new rotor.
• Start both bracket bolts by hand to avoid cross-threading.
• Use a 15mm socket and 3/8-inch drive ratchet to snug the bolts.
• Use a torque wrench and 15mm socket to tighten them.
• Torque rear caliper bracket bolts to 103 Nm (76 ft-lbs).

Step 13: Compress and Rotate the Rear Caliper Piston

• Use the rear brake caliper piston rewind tool to rotate the piston clockwise while pushing it inward.
• Go slowly and keep the tool square against the piston.
• Watch the brake fluid reservoir while compressing the piston so it does not overflow.
• The piston must fully seat so the caliper fits over the new, thicker pads.
• Slow pressure protects the seals.

Step 14: Install the New Rear Brake Pads

• Install the new rear brake pads into the caliper bracket by hand.
• Make sure the pad friction material faces the rotor.
• The wear indicator, if present, should match the original pad position.
• Slide the pads back and forth slightly to confirm they move freely in the clips.

Step 15: Reinstall the Rear Caliper

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

Step 16: Repeat on the Other Rear Side

• Repeat Steps 4 through 15 on the opposite rear brake.
• Use the same tools and the same torque specs.
• Always replace rear pads and rotors as a left-and-right pair.

Step 17: Reinstall the Rear Wheels

• Install each rear wheel onto the hub.
• Start all lug nuts by hand first.
• Use a 19mm socket to snug the lug nuts in a star pattern.
• Raise the car slightly with the floor jack, remove the jack stands, and lower the car until the tires touch the ground.
• Use a torque wrench and 19mm socket to tighten the lug nuts in a star pattern.
• Torque rear wheel lug nuts to 204 Nm (150 ft-lbs).

Step 18: Pump the Brake Pedal

• Before moving the car, press the brake pedal slowly several times until it feels firm.
• This moves the caliper pistons back against the new pads.
• Check the brake fluid reservoir and top off with DOT 4 brake fluid if needed.
• Install the brake fluid reservoir cap securely.

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✅ After Repair

• ✅ Start your Mustang and press the brake pedal again. It should feel firm, not spongy.
• ✅ Recheck for brake fluid leaks around both rear calipers.
• ✅ Test the parking brake at low speed in a safe area.
• ✅ Do a gentle road test first. Avoid hard braking until the pads are bedded in.
• ✅ Bedding-in procedure: make 8-10 moderate stops from about 35 mph to 10 mph, allowing 30-60 seconds between stops for cooling.
• ✅ After the test drive, recheck lug nut torque with a torque wrench and 19mm socket.

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💰 DIY vs Shop Cost

Shop Cost: $350-$650 (parts + labor)

DIY Cost: $120-$280 (parts only)

You Save: $230-$370 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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