🔧 550i - Rear Brake Pad Replacement

You’ll remove the rear wheels, swing the rear brake calipers out of the way, and swap the old pads for new ones. This restores safe braking and prevents metal-to-metal damage when pads get thin.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and support the car with jack stands—never rely on a jack alone.
• ⚠️ Make sure the electronic parking brake is fully released before starting.
• ⚠️ Brakes may be hot; let them cool before touching calipers/rotors.
• ⚠️ Do not press the brake pedal while a caliper is removed.
• ⚠️ Avoid breathing brake dust; use brake cleaner, not compressed air.

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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
• 17mm socket
• Torque wrench (20–200 Nm range)
• Breaker bar (1/2")
• Ratchet (3/8" or 1/2")
• 7mm hex bit socket
• 16mm socket
• 18mm socket
• Flathead screwdriver
• Brake caliper hanger hook
• C-clamp or brake caliper piston compressor (specialty)
• Wire brush
• Brake cleaner spray
• 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 pad wear sensor - Qty: 1
• Brake lubricant (silicone/ceramic) - Qty: 1
• Brake hardware/anti-rattle clip set - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and make sure the electronic parking brake is released.
• Chock the front wheels with wheel chocks.
• Crack the rear wheel bolts loose slightly using a 17mm socket and breaker bar before lifting.
• Assumption: typical rear caliper uses 7mm guide pins.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and secure the rear

• Use a floor jack to lift the rear at the correct jack point.
• Place jack stands under the rear support points and lower the car onto them.
• Give the car a gentle shake to confirm it’s stable.

Step 2: Remove the rear wheels

• Remove the wheel bolts using a 17mm socket and ratchet.
• Remove both rear wheels and set them aside.

Step 3: Remove the caliper spring clip

• On the outside face of the caliper, pry out the spring/retaining clip using a flathead screwdriver.
• Tip: cover the clip with your hand.

Step 4: Remove the caliper guide bolts

• On the back of the caliper, remove the two guide/slide bolts using a 7mm hex bit socket and ratchet.
• Set the bolts aside where they won’t get dirty.

Step 5: Lift off and support the caliper

• Carefully lift the caliper off the pads/rotor.
• Hang the caliper from the suspension spring using a brake caliper hanger hook.
• Do not let the caliper hang by the brake hose.

Step 6: Remove old pads and hardware

• Pull the inner and outer pads out by hand.
• Remove any pad abutment clips/hardware from the bracket (if included in your kit).
• Clean the bracket pad contact areas using brake cleaner spray and a wire brush.

Step 7: Disconnect and replace the pad wear sensor

• If equipped, the wear sensor is clipped into one of the rear pads (commonly the right rear).
• Unclip the sensor from the old pad by hand (or gently with a flathead screwdriver).
• Follow the wire to its connector, open the small cover, and disconnect it by hand.
• Route the new sensor the same way and reconnect it firmly.

Step 8: Compress the caliper piston

• Place the old inner pad against the piston face.
• Use a C-clamp or brake caliper piston compressor (specialty) to slowly press the piston back into the caliper.
• Go slowly and keep it straight so it doesn’t bind.
• Tip: slow compression helps avoid overflow.

Step 9: Install new hardware and pads

• Install new pad abutment clips/hardware (if provided) by hand.
• Apply a thin film of brake lubricant (silicone/ceramic) to pad ears where they slide on the bracket.
• Install the new inner and outer pads into the bracket by hand.
• Clip the new wear sensor into the correct pad (if applicable).

Step 10: Reinstall the caliper

• Lower the caliper over the new pads and align the guide bolt holes.
• Install and tighten the guide bolts using a 7mm hex bit socket and torque wrench.
• Torque to 30 Nm (22 ft-lbs)

Step 11: Reinstall the caliper spring clip

• Reinstall the spring/retaining clip on the caliper face using a flathead screwdriver.
• Confirm it’s fully seated and secure.

Step 12: Reinstall wheels and torque wheel bolts

• Put the wheels back on and hand-thread the wheel bolts.
• Lower the car to the ground using the floor jack.
• Torque wheel bolts in a star pattern using a torque wrench.
• Torque to 120 Nm (89 ft-lbs)

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✅ After Repair

• With the car on the ground, pump the brake pedal 10–15 times until it feels firm.
• Start the car and confirm the brake warning light behavior is normal.
• Apply and release the electronic parking brake to confirm normal operation.
• Test-drive at low speed first and confirm braking is smooth and quiet.
• Pad bed-in (break-in): do 6–10 moderate stops from ~35 mph to ~5 mph, letting brakes cool a bit between stops.

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💰 DIY vs Shop Cost

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

DIY Cost: $90-$250 (parts only)

You Save: $260-$400 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.