🔧 Impreza - Rear Brake Pads & Rotor Replacement

You’ll remove the rear wheels, take off the rear calipers, replace the pads, and swap the rear rotors. On your Impreza, the parking brake is a small drum brake inside the “hat” of the rear rotor, so the rotor can stick if the parking brake is adjusted too tight or rusty.

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

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⚠️ Safety & Precautions

• 🛑 Work on level ground and support the car on jack stands—never rely on a jack alone.
• 🧤 Brake dust is harmful—wear a mask and safety glasses; use brake cleaner, not compressed air.
• 🔥 Brakes can be hot—let everything cool before touching.
• 🚫 Do not press the brake pedal with a caliper removed (the piston can pop out).
• 🧷 Release the parking brake fully before rear rotor removal.

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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, pair)
• Wheel chocks
• 19mm socket
• 3/8" drive ratchet
• 1/2" drive breaker bar
• Torque wrench (20–200 Nm range)
• 14mm socket
• 17mm socket
• 14mm wrench
• Flathead screwdriver
• C-clamp or brake caliper piston compressor (specialty)
• Steel wire hook or bungee cord
• Hammer (16 oz)
• Rubber mallet
• Wire brush
• Micrometer or vernier caliper (specialty)
• Shop towels
• Safety glasses
• Nitrile gloves

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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 pad hardware kit (clips/shims) - Qty: 1
• Brake parts cleaner - Qty: 1
• High-temp silicone brake grease - Qty: 1
• DOT 3 brake fluid - As needed - Qty: 1
• Anti-seize compound - Optional - Qty: 1

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📋 Before You Begin

• 🧱 Park on level ground, put the shifter in Park, and chock the front wheels with wheel chocks.
• 🅿️ Fully release the parking brake (rear rotor won’t come off if it’s applied).
• 🧴 Open the hood and check the brake fluid level; as you compress pistons, fluid can rise—remove a little if it’s near “MAX.”

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen lug nuts and raise the rear

• Use a 19mm socket and breaker bar to loosen rear lug nuts about 1 turn (do not remove yet).
• Lift the rear with a floor jack (rated 2-ton minimum) and set the car on jack stands at the proper rear jack points.
• Remove the wheels using the 19mm socket.

Step 2: Remove the rear caliper (the clamp that squeezes pads)

• Turn the steering wheel straight and look at the rear caliper.
• Use a 14mm socket (and a 14mm wrench if needed to hold the slide) to remove the two caliper slide bolts. Slide bolts are the small bolts on the caliper.
• Lift the caliper off the bracket and hang it from the suspension using a steel wire hook or bungee cord (never let it hang by the hose).

Step 3: Remove old pads and inspect the bracket

• Pull the old brake pads out of the caliper bracket by hand (use a flathead screwdriver gently if they’re stuck).
• Remove the pad clips/hardware from the bracket using a flathead screwdriver.
• Clean the bracket pad “rails” with brake parts cleaner and a wire brush.

Step 4: Remove the caliper bracket (the pad carrier)

• Use a 17mm socket and breaker bar to remove the two caliper bracket bolts.
• Set the bracket aside.
• Torque spec (reinstall later): Torque to 65 Nm (48 ft-lbs)

Step 5: Remove the rotor (and back off the parking brake if needed)

• Pull the rotor straight off the hub.
• If the rotor won’t come off, the internal parking brake (drum-in-hat) is likely holding it:
  • Use a flathead screwdriver to remove the small rubber access plug on the rotor hat/backing plate area (if equipped).
  • Use the flathead screwdriver to turn the star-wheel adjuster to loosen the parking brake shoes (small turns, then retry rotor removal).
• If rust is holding it, tap the rotor hat with a rubber mallet or hammer (16 oz) (controlled hits, don’t hit studs).

Step 6: Prep the hub and install the new rotor

• Clean the hub face with a wire brush and brake parts cleaner so the rotor sits flat.
• Apply a very thin film of anti-seize compound to the hub center (optional; keep it off braking surfaces).
• Install the new rotor. If it’s oily from packaging, spray both sides with brake parts cleaner and wipe with shop towels.

Step 7: Service slide pins and reinstall the caliper bracket

• Pull the caliper bracket slide pins out (they’re the smooth pins the caliper slides on). Slide pins must move freely.
• Wipe old grease off with shop towels, then apply fresh high-temp silicone brake grease and reinstall pins.
• Reinstall the caliper bracket using a 17mm socket.
• Torque spec: Torque to 65 Nm (48 ft-lbs)

Step 8: Install new pad hardware and pads

• Install new pad clips/hardware into the bracket (from the rear pad hardware kit).
• Apply a light smear of high-temp silicone brake grease where the pad ears touch the clips (metal-to-metal contact only).
• Install the new pads into the bracket (inner/outer orientation should match your old pads).

Step 9: Compress the caliper piston and reinstall the caliper

• Use a C-clamp or brake caliper piston compressor (specialty) to slowly push the rear caliper piston back in. This makes room for thicker new pads.
• Watch the brake fluid reservoir while compressing; remove excess fluid if needed.
• Place the caliper over the new pads and install the slide bolts using a 14mm socket (hold with 14mm wrench if the pin spins).
• Torque spec: Torque to 27 Nm (20 ft-lbs)

Step 10: Repeat on the other rear wheel

• Repeat Steps 2–9 on the other side (do one side at a time so you can reference the assembled side).

Step 11: Reinstall wheels and torque lug nuts

• Reinstall wheels and hand-thread lug nuts.
• Lower the car off the jack stands using the floor jack.
• Use a torque wrench (20–200 Nm range) with a 19mm socket to tighten lug nuts in a star pattern.
• Torque spec: Torque to 120 Nm (89 ft-lbs)

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✅ After Repair

• 🦶 Pump the brake pedal 10–15 times until it feels firm (this seats the pads against the rotors).
• 🧴 Recheck brake fluid level and top off with DOT 3 brake fluid if needed.
• 🔍 Check for leaks, confirm caliper bolts are tight, and make sure wheels spin freely with parking brake released.
• 🛣️ Bed-in the pads: make 6–10 moderate stops from ~60 to 20 km/h, with cool-down driving between. Avoid hard stops while stopped (prevents pad imprint).
• 🅿️ Test the parking brake hold on a safe incline after a short drive.

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💰 DIY vs Shop Cost

Shop Cost: ₹9,000-₹18,000 (parts + labor)

DIY Cost: ₹4,500-₹10,000 (parts only)

You Save: ₹4,500-₹8,000 by doing it yourself!

Shop labor rates vary but typically run ₹800-₹2,000/hour. This repair takes a shop approximately 1.5-2.5 hours.

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