🔧 Rear Brakes & Rotors - Replacement

Replacing your A4’s rear brake pads and rotors means removing the rear wheels, swapping the rotor and pad set, then reassembling everything with clean, lubricated slide pins so the brakes move freely.

This restores stopping power, reduces noise/vibration, and prevents uneven pad wear.

Difficulty Level: Intermediate | Estimated Time: 2.0-4.0 hours

Assumption: Rear disc brakes with mechanical (cable) parking brake at the caliper.

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⚠️ Safety & Precautions

• ⚠️ Work on a flat, solid surface; never rely on a jack alone—use jack stands.
• ⚠️ Release the parking brake before starting rear brake work, or the pads/rotor may be locked in place.
• ⚠️ Brake dust is harmful—wear a dust mask and use brake cleaner (don’t blow with compressed air).
• ⚠️ Don’t let the caliper hang by the hose—support it with a caliper hanger hook.
• ⚠️ If brake fluid rises near the cap when compressing pistons, remove some with a fluid syringe to prevent overflow.

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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
• Lug nut socket 19mm
• Breaker bar 1/2-inch drive
• Torque wrench 1/2-inch drive (20-200 ft-lbs range)
• Ratchet 3/8-inch drive
• Socket set metric 10mm-21mm
• Wrench set metric 10mm-21mm
• Hex key socket set metric 5mm-10mm
• Caliper piston compression tool
• Disc brake piston wind-back tool kit (specialty)
• Caliper hanger hook
• Flathead screwdriver
• Pry bar
• Rubber mallet
• Wire brush
• Brake cleaner spray
• Shop towels
• Nitrile gloves
• Safety glasses
• Dust mask
• Fluid syringe

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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 - Qty: 1
• Brake caliper slide pin grease (silicone) - Qty: 1
• Threadlocker (medium strength) - Qty: 1
• Brake cleaner - Qty: 2 cans
• Anti-seize compound - Qty: 1

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📋 Before You Begin

• Park on level ground, put the transmission in P, and place wheel chocks at the front wheels.
• Make sure the parking brake is fully released before lifting the rear.
• Crack the rear lug nuts loose using a 19mm socket and breaker bar before the wheels leave the ground.
• Open the hood and check the brake fluid level; if it’s near MAX, use a fluid syringe to remove a little fluid.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the rear

• Lift the rear with a floor jack at the proper rear jack point.
• Set the vehicle onto jack stands placed under the rear support points.
• Give the vehicle a gentle shake to confirm it’s stable.

Step 2: Remove the rear wheels

• Remove lug nuts using a 19mm socket and ratchet.
• Remove both rear wheels and set them aside.

Step 3: Remove the caliper (outer piece)

• Turn the steering wheel is not applicable—rear stays straight.
• Locate the rear caliper slide pin bolts (typically on the back of the caliper).
• Remove the caliper slide pin bolts using a ratchet with the correctly sized socket or hex key socket (depending on your caliper).
• Lift the caliper off the bracket. Support it with a caliper hanger hook.
• Don’t twist or stretch the hose.

Step 4: Remove the old brake pads and hardware

• Slide the pads out of the bracket by hand; use a flathead screwdriver to gently pry if stuck.
• Remove the stainless pad clips (hardware) using a flathead screwdriver.
• Clean the bracket pad “lands” (where clips sit) using a wire brush and brake cleaner spray.

Step 5: Remove the caliper bracket

• Remove the caliper bracket bolts using a breaker bar and the correct socket (commonly 15mm-18mm depending on brake package).
• Set the bracket on a towel.
• Reinstall later with medium threadlocker on clean bolt threads.
• Torque to 115 Nm (85 ft-lbs).

Step 6: Remove the old rotor

• If there is a rotor retaining screw, remove it using the correct Torx/Phillips bit socket from your socket set.
• Pull the rotor straight off. If stuck, tap the rotor hat with a rubber mallet.
• If the rotor won’t come off, confirm the parking brake is released, then try again.

Step 7: Prep the hub and install the new rotor

• Clean rust from the hub face using a wire brush and brake cleaner spray.
• Apply a paper-thin film of anti-seize compound to the hub face (avoid wheel studs).
• Clean the new rotor braking surfaces using brake cleaner spray and shop towels.
• Install the new rotor. If equipped, reinstall the retaining screw using a bit socket.
• Torque to 10 Nm (89 in-lbs).

Step 8: Service the slide pins (so the caliper can move)

• Pull the slide pins out of the bracket by hand.
• Wipe them clean with shop towels and spray the bores lightly with brake cleaner spray (let dry).
• Apply brake caliper slide pin grease (silicone) in a thin coat and reinstall the pins.
• Sticky pins cause uneven pad wear.

Step 9: Install new pad hardware and pads

• Install the new pad clips into the bracket by hand; press them fully seated.
• Apply a very light smear of brake caliper slide pin grease where pads contact the clips (not on pad friction material).
• Install the new pads into the bracket.

Step 10: Compress the rear caliper piston

• Before compressing, check the brake fluid reservoir; remove fluid with a fluid syringe if it’s too full.
• Use a caliper piston compression tool to slowly push the piston back in.
• If the piston will not push straight in, use a disc brake piston wind-back tool kit (specialty) (this tool rotates while pressing, used on some rear calipers with parking brake mechanism).
• Stop when the piston is fully seated and the caliper fits over the new pads.

Step 11: Reinstall caliper and bolts

• Place the caliper over the new pads.
• Install and tighten the slide pin bolts using a ratchet and correct socket or hex key socket.
• Torque to 35 Nm (26 ft-lbs).

Step 12: Reinstall wheels

• Reinstall wheels and hand-thread lug nuts.
• Lower the vehicle off the jack stands using the floor jack.
• Tighten lug nuts in a star pattern using a torque wrench.
• Torque to 135 Nm (100 ft-lbs).

Step 13: Repeat on the other rear side

• Repeat Steps 3-12 for the other rear wheel.
• Do one side at a time to stay organized.

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✅ After Repair

• With the engine OFF, pump the brake pedal 10-15 times until it feels firm (this seats the pistons against the pads).
• Check brake fluid level and top off only if needed.
• Re-apply and release the parking brake a few times to confirm normal feel.
• Test drive at low speed first, then perform pad bedding: 6-10 moderate stops from 30-40 mph, allowing a little cool-down between stops.
• Recheck for leaks, odd noises, or pulling. Re-torque lug nuts after 25-50 miles using a torque wrench.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $140-$320 (parts only)

You Save: $310-$530 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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