🔧 Ascent - Rear Brake Pads & Rotor Replacement

You’ll remove the rear wheels, take off the rear calipers and brackets, replace the rotors and pads, then reassemble and bed-in the brakes. On your Ascent, the rear calipers work with an electronic parking brake (EPB), so the EPB must be put into service mode before you push the pistons back.

Difficulty Level: Intermediate | Estimated Time: 2.0-3.5 hours

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⚠️ Safety & Precautions

• 🛑 Support the SUV on jack stands; never rely on a jack alone.
• 🧱 Chock the front wheels before lifting the rear.
• 🔥 Brakes can be hot; let them cool before starting.
• ⚡ Do not press the brake pedal with a caliper removed.
• 🅿️ Because you have an electronic parking brake, you must retract it using a scan tool EPB service mode before compressing the rear caliper pistons.

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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
• Torque wrench (20–150 ft-lbs range)
• Breaker bar (1/2-inch drive)
• 19mm socket
• 14mm socket
• 17mm socket
• Ratchet (1/2-inch drive)
• Ratchet (3/8-inch drive)
• Flat trim/pry tool
• C-clamp brake piston compressor tool
• Caliper hanger hook
• Wire brush
• Brake cleaner spray
• Dead-blow hammer
• M8 x 1.25 bolts (2 pieces, 30–40mm long)
• High-temp brake grease
• Nitrile gloves
• Safety glasses
• Scan tool with EPB service mode (specialty)

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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 pad hardware/abutment clip kit - Qty: 1
• Brake caliper slide pin boots (if torn) - Qty: 1
• Brake fluid (DOT 3 or DOT 4) - Qty: 1 bottle

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📋 Before You Begin

• Park on level ground, set the steering straight, and put the transmission in Park.
• Chock both front wheels using wheel chocks.
• Make sure your scan tool can run EPB Service Mode (this retracts the parking brake motor so the piston can be pushed back).
• Loosen the rear wheel lug nuts slightly before lifting the vehicle.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Put the EPB into service mode

• Connect your scan tool with EPB service mode (specialty) to the OBD port.
• Turn ignition ON (engine off) and follow the scan tool prompts for EPB Service Mode / Rear Brake Maintenance Mode.
• Wait until the scan tool confirms the EPB is fully retracted.
• If EPB won’t retract, don’t force the piston.

Step 2: Lift the rear and remove the wheels

• Use a breaker bar (1/2-inch drive) with a 19mm socket to loosen lug nuts 1/2 turn.
• Lift the rear using the floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove lug nuts with a 19mm socket and take both rear wheels off.

Step 3: Remove the rear caliper (do not let it hang)

• Turn the rear hub by hand to access bolts easily.
• Remove the caliper slide pin bolts using a 14mm socket and ratchet (3/8-inch drive).
• Lift the caliper off the bracket and support it with a caliper hanger hook.
• Never hang the caliper by the hose.

Step 4: Remove pads and caliper bracket

• Slide the old pads out of the bracket.
• Remove the caliper bracket bolts using a 17mm socket and breaker bar (1/2-inch drive).
• Set the bracket aside.
• Torque to 80 Nm (59 ft-lbs) for the bracket bolts during reassembly.

Step 5: Remove the rotor

• If the rotor is stuck, spray the hub area with brake cleaner spray and let it soak briefly.
• Thread two M8 x 1.25 bolts (2 pieces, 30–40mm long) into the rotor’s jacking holes evenly, using a ratchet (3/8-inch drive) to “push” the rotor off.
• If needed, tap the rotor hat with a dead-blow hammer to break rust loose.

Step 6: Clean and prep the hub and bracket

• Clean the hub face with a wire brush so the new rotor sits flat.
• Clean the caliper bracket pad contact points with a wire brush and brake cleaner spray.
• Apply a thin film of high-temp brake grease on the pad-to-bracket contact points (not on friction surfaces).

Step 7: Install the new rotor

• Spray both sides of the new rotor with brake cleaner spray to remove protective oil.
• Place the rotor onto the hub and hold it in place with one lug nut (hand-tight) using the 19mm socket.

Step 8: Reinstall the caliper bracket and install new pads

• Reinstall the caliper bracket using a 17mm socket and ratchet (1/2-inch drive).
• Torque to 80 Nm (59 ft-lbs).
• Install new hardware clips (from your pad hardware kit), then slide the new pads into place.

Step 9: Compress the caliper piston and reinstall the caliper

• Open the brake fluid reservoir cap under the hood (loosely) to help the piston compress.
• Use a C-clamp brake piston compressor tool to slowly push the rear caliper piston straight back in. (A piston compressor is a clamp that presses the piston in evenly.)
• Reinstall the caliper over the new pads.
• Install the slide pin bolts using a 14mm socket and ratchet (3/8-inch drive).
• Torque to 27 Nm (20 ft-lbs) for the slide pin bolts.
• Go slow; don’t cock the piston.

Step 10: Repeat on the other rear side

• Repeat Steps 3–9 for the other rear wheel.

Step 11: Re-enable EPB and reinstall wheels

• Use the scan tool with EPB service mode (specialty) to exit service mode and reapply/initialize the EPB per prompts.
• Reinstall both wheels and hand-tighten lug nuts using a 19mm socket.
• Lower the SUV off the stands using the floor jack (rated 3-ton minimum).
• Torque to 120 Nm (89 ft-lbs) for lug nuts using a torque wrench (20–150 ft-lbs range).

Step 12: Pump the brake pedal

• With the vehicle on the ground, press the brake pedal slowly 10–15 times until it feels firm.
• Check the brake fluid level and top off with brake fluid (DOT 3 or DOT 4) if needed.

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✅ After Repair

• Test the EPB: apply and release it several times and confirm no warning lights remain.
• Road test at low speed first; confirm no grinding, pulling, or vibration.
• Bed-in the pads: do 6–10 medium stops from ~35 mph down to ~5 mph, letting brakes cool between stops.
• Recheck lug nut torque after 25–50 miles using a torque wrench (20–150 ft-lbs range).

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💰 DIY vs Shop Cost

Shop Cost: ₹18,000-₹35,000 (parts + labor)

DIY Cost: ₹8,000-₹20,000 (parts only)

You Save: ₹10,000-₹15,000 by doing it yourself!

Shop labor rates vary but typically run ₹1,000-₹2,500/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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