🔧 Sonata - Rear Brake Pads & Rotor Replacement

You’ll remove the rear wheels, unbolt the brake caliper and bracket, replace the pads and rotors, then reassemble and bed-in the new pads. This restores safe stopping power and prevents noise/vibration caused by worn pads or warped rotors.

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

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⚠️ Safety & Precautions

• ⚠️ Work on level ground; chock the front wheels before lifting the rear.
• ⚠️ Support the car with jack stands—never rely on a floor jack alone.
• ⚠️ Release the parking brake fully before removing rear calipers/rotors.
• ⚠️ Don’t let the caliper hang by the brake hose; support it with a hook.
• ⚠️ Brake dust is unhealthy—use brake cleaner, not compressed air.
• ⚠️ Battery disconnect is not required for this rear brake/rotor job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (pair, rated 2-ton minimum)
• Wheel chocks (pair)
• 21mm socket
• Breaker bar (1/2")
• Torque wrench (10–200 Nm range)
• Ratchet (3/8")
• 14mm socket
• 17mm socket
• Short extension (3/8")
• Flathead screwdriver
• C-clamp (6")
• Wire brush
• Bungee cord or mechanics wire
• Rubber mallet
• Phillips screwdriver #3
• Brake cleaner spray
• Catch pan
• Nitrile gloves
• Safety glasses

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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 pad hardware kit (clips/shims) - Qty: 1
• Brake lubricant (high-temp silicone or ceramic) - Qty: 1
• Brake fluid (DOT 3 or DOT 4) - Qty: 1 bottle
• Rear rotor set screws - Qty: 2

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📋 Before You Begin

• Park on level ground, put the shifter in P, and fully release the parking brake.
• Chock both front wheels using wheel chocks.
• Crack the rear lug nuts loose 1/2 turn with a 21mm socket and breaker bar before lifting.
• Open the hood and loosen the brake fluid reservoir cap (do not remove it completely). This helps the caliper piston push back easier.
• Take a quick photo of each side before disassembly.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the rear

• Lift the rear using a floor jack (rated 2-ton minimum) at the rear center jacking point.
• Place jack stands (pair, rated 2-ton minimum) under the left and right rear pinch welds (or rear support points) and lower onto the stands.
• Remove the rear wheels using a 21mm socket and ratchet (3/8").

Step 2: Remove the caliper (outer moving part)

• Turn the steering wheel is not needed for rear; just get comfortable access.
• Remove the two caliper slide bolts using a 14mm socket and ratchet (3/8").
• Lift the caliper off the pads/rotor and hang it from the suspension spring using a bungee cord or mechanics wire. (This prevents brake-hose damage.)

Step 3: Remove old pads and inspect

• Pull the brake pads out of the bracket by hand; use a flathead screwdriver gently if they’re stuck.
• Remove the pad clips/hardware from the bracket using a flathead screwdriver.
• Spray the bracket area with brake cleaner spray and catch runoff in a catch pan.

Step 4: Remove the caliper bracket (the fixed mount)

• Remove the two bracket bolts using a 17mm socket, breaker bar (1/2"), and short extension (3/8") if needed.
• Set the bracket aside.
• When reinstalling later: Torque to 70–80 Nm (52–59 ft-lbs).

Step 5: Remove the rotor

• If your rotor has a retaining screw, remove it using a Phillips screwdriver #3.
• Pull the rotor straight off the hub.
• If it’s stuck, tap the rotor hat area with a rubber mallet while rotating the rotor.
• Don’t hit wheel studs.

Step 6: Clean the hub and prep the new rotor

• Clean rust off the hub face using a wire brush. A clean hub helps prevent rotor wobble and pedal pulsation.
• Spray the new rotor surfaces with brake cleaner spray and wipe clean (removes shipping oil).
• Install the new rotor onto the hub. If equipped, reinstall the retaining screw using a Phillips screwdriver #3 and snug it (do not over-tighten).

Step 7: Reinstall the caliper bracket with new hardware clips

• Install the new pad clips/hardware onto the bracket (from your hardware kit).
• Reinstall the bracket bolts using a 17mm socket and ratchet (3/8").
• Torque to 70–80 Nm (52–59 ft-lbs) using a torque wrench (10–200 Nm range).

Step 8: Compress the caliper piston

• Place the old inner pad against the piston face, then compress the piston slowly using a C-clamp (6").
• A C-clamp is a screw clamp that pushes the piston straight back into the caliper.
• Watch the brake fluid reservoir as you compress—if it gets too full, remove a little fluid safely (use the catch pan).
• Go slow to avoid damaging seals.

Step 9: Install new pads and refit the caliper

• Apply a thin layer of brake lubricant (high-temp silicone or ceramic) to pad ears (where pads slide in the clips). Do not get lube on pad friction material or rotor.
• Install the new pads into the bracket by hand.
• Lower the caliper over the new pads/rotor.
• Reinstall the caliper slide bolts using a 14mm socket and ratchet (3/8").
• Torque to 25–30 Nm (18–22 ft-lbs) using a torque wrench (10–200 Nm range).

Step 10: Repeat on the other rear wheel

• Repeat Steps 2–9 on the other rear side.
• Do one side at a time to avoid mixing parts.

Step 11: Reinstall wheels and torque lug nuts

• Reinstall both wheels using a 21mm socket.
• Lower the car off the jack stands (pair, rated 2-ton minimum) using the floor jack (rated 2-ton minimum).
• Torque the lug nuts in a star pattern using a torque wrench (10–200 Nm range): Torque to 90–110 Nm (66–81 ft-lbs).

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✅ After Repair

• Before driving, pump the brake pedal 10–15 times until it feels firm. This seats the pistons against the new pads.
• Check the brake fluid level and top off with DOT 3 or DOT 4 if needed.
• Do a slow test drive in a safe area. Confirm no grinding, pulling, or warning lights.
• Bed-in the pads: make 6–10 moderate stops from ~50 km/h to ~10 km/h, letting brakes cool a minute between stops.
• Re-check lug nut torque after 50–100 km using a torque wrench (10–200 Nm range).

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💰 DIY vs Shop Cost

Shop Cost: ₹12,000–₹25,000 (parts + labor)

DIY Cost: ₹6,000–₹14,000 (parts only)

You Save: ₹6,000–₹11,000 by doing it yourself!

Shop labor rates vary locally; this repair typically books about 2–3 hours.

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