Brake Caliper Removal Guide

Replacing your car's brake pads or rotors is a common maintenance task that many DIY enthusiasts can tackle. A crucial part of this process involves removing the brake caliper. This component houses the brake pads and the piston(s) that press them against the rotor. Knowing how to correctly remove and reinstall a brake caliper is essential for ensuring your braking system functions safely and effectively. This guide will walk you through the process, covering both front and rear brake systems, along with the necessary tools and important considerations.

Disclaimer: The procedures, methods, and products described here were specific to the circumstances of the author and were performed on a 2001 Automatic vehicle. We make no promises that your results will be the same, nor do we claim that this is the definitive best way to perform this task. Proceed at your own risk!

WARNING on working under a raised vehicle: This procedure requires the vehicle to be raised. Never depend on a jack alone. Always use sturdy jack stands and place them securely under the designated lift points as described in your vehicle's owner's manual.

Brake Pad and Rotor Replacement Time Estimates

• Pad Replacement: 1 to 1.5 hours
• Rotor/Pad Replacement: 2 to 2.5 hours

Tools Needed for Front Pad/Rotor Replacement

For Pad Replacement:

• Torque wrench (capable of up to 100 ft lbs)
• 14mm box wrench
• 14mm 3/8” socket
• 17mm combination wrench
• Dead-blow hammer (rubber hammer filled with buckshot)
• Small wood block
• 6” c-clamp or very large channel locks
• Needle nose pliers
• Metal pry bar or the back of a crescent wrench
• Masking tape
• High-quality grease
• Small bungee cord or bent coat hanger
• Turkey baster

Additional Tools for Rotor/Pad Replacement:

• 12mm offset box wrench
• 17mm deep 3/8” socket
• 2” 3/8” extension
• 12mm bolt (ensure it's the correct thread pitch for your rotor)
• 220 grit sand paper

Front Brake Pad/Rotor Replacement Procedure

Step 1: Preparation

Begin by safely jacking up the vehicle. Ensure it is stable on jack stands. Remove the wheel to gain access to the brake assembly.

Step 2: Remove Caliper Bolts

Locate the two 14mm caliper bolts. These typically secure the caliper to the caliper bracket. Use your 14mm socket or box wrench to loosen and remove them. If the bolts are seized or turning without loosening, you may need to use the 17mm open-end wrench on the sliding pin to hold it in place while you turn the bolt. A gentle tap with the dead-blow hammer can help loosen stubborn bolts.

Step 3: Hang the Caliper

Once the caliper bolts are removed, the caliper will be loose. Do not let it hang by the brake hose. Use a small bungee cord or a bent coat hanger to suspend the caliper safely out of the way, ensuring the brake hose is not strained or kinked.

Step 4: Remove Brake Pads and Anti-Squeal Springs

With the caliper out of the way, you can now remove the old brake pads. They may be held in place by anti-squeal springs. Gently pry these springs off using needle nose pliers or a small pry bar. Note the orientation of the pads, especially the inner pad which often has directional arrows indicating the direction of forward rotation. The minimum thickness for a brake pad is typically 1mm.

Step 5: Transfer Shims and Apply Grease

Carefully remove the anti-squeal shims from the old brake pads. These are thin metal plates that help reduce brake noise. Clean these shims thoroughly and reinstall them onto the new brake pads. It's also a good practice to apply a thin layer of high-quality brake grease to the back of the new pads where they contact the caliper piston and the caliper bracket, and also on the sliding pins (if you are removing the caliper bracket). Some people also apply an anti-squeal compound, often referred to as "goop," to the back of the pads before installing the shims, though this is not always strictly necessary.

Step 6: Compress Caliper Pistons

Before installing the new pads, you'll need to retract the caliper piston(s) back into the caliper body. This creates the necessary space for the thicker new pads. To do this, place a small wood block against the piston(s) and use a 6” c-clamp or large channel locks to slowly and steadily push the piston(s) back into the caliper. Be very careful not to scratch or damage the piston or its rubber dust boot. If the dust boot is torn, it's advisable to consult with your dealer about a replacement caliper or boot kit, as this is critical for preventing contamination.

Step 7: Remove Brake Fluid (Optional but Recommended)

As you compress the pistons, brake fluid will be pushed back into the master cylinder reservoir. To prevent overflow, it’s recommended to remove a small amount of brake fluid from the reservoir using a turkey baster. Ensure you have a suitable container for the old fluid.

Step 8: Rotor Replacement - Remove Caliper Bracket

If you are replacing the rotor, you’ll need to remove the caliper bracket as well. This is usually held in place by two 17mm bolts. These bolts can be quite tight, often torqued to around 87 ft lbs. It’s often easier to "snap" them loose with a breaker bar or by applying steady pressure with a wrench rather than trying to maintain constant torque. The dead-blow hammer can be useful here for persuasion. Use a 17mm deep socket to provide better clearance for your wrench or ratchet.

Step 9: Rotor Replacement - Loosen the Rotor

Rotors can become seized to the hub due to rust. Most rotors have two threaded holes. Screw in a 12mm bolt (greased well) into one of these holes. As you tighten the bolt, it acts as a wedge, pushing the rotor off the hub. You may need an offset wrench or ratchet to get sufficient leverage. The rotor might release with a loud "pop." Once you hear this, the rotor should be loose enough to be removed.

Step 10: Rotor Replacement - Hub Preparation

Once the old rotor is off, clean any surface rust from the hub mating surface using 220 grit sandpaper. This ensures the new rotor sits flush and true.

Step 11: Rotor Replacement - Caliper Bracket Sliding Pins

While the caliper bracket is off, it’s a good time to service the sliding pins. Carefully remove the pins by pinching the rubber gasket and twisting. Clean the pins thoroughly and apply a generous amount of high-quality grease to them before reinstalling. This ensures the caliper can move freely, which is vital for even pad wear and proper braking.

Installation is the Reverse of Removal

For both pad and rotor replacement, the installation process is generally the reverse of the removal steps. Ensure all bolts are torqued to the manufacturer's specifications. For the front caliper bolts, torque is typically around 25 ft lbs, while the caliper bracket bolts are usually much tighter, around 87 ft lbs.

Rear Brake Pad/Rotor Replacement Procedure

The rear brake system often has some differences, particularly in how the caliper is retracted and how the pads are held.

Step 1: Remove Anti-Squeal Spring

On the rear caliper, you might find an anti-squeal spring that needs to be removed first. This often involves pushing it away from the caliper.

Step 2: Remove Pad Guide Pin Clip and Pin

Using needle nose pliers, remove the clip that secures the pad guide pin. Then, remove the guide pin itself. This will allow the caliper to pivot or be opened further.

Step 3: Remove Brake Pads

With the guide pin removed, you should be able to access and remove the rear brake pads by pulling them towards the rear of the car.

Step 4: Remove Brake Fluid (Optional)

As with the front brakes, consider removing a small amount of brake fluid from the reservoir to prevent overflow when retracting the rear caliper pistons.

Step 5: Retract Rear Caliper Pistons

Rear caliper pistons often require a special tool to retract them, as many are designed to screw back in rather than simply push. If yours doesn't screw in, you might be able to use a pry bar, but be extremely careful. Wrap the pry bar or the back of a crescent wrench with masking tape to protect the piston surface. Push or screw the piston back into the caliper. A common technique if you're pushing both pistons is to remove one pad, push one piston in, insert a new pad, and then push the opposing piston in. This helps manage the fluid and prevents the first piston from pushing back out as you work on the second.

Step 6: Transfer Shims and Apply Grease

Just like with the front brakes, transfer the anti-squeal shims from the old rear pads to the new ones. Clean them and reinstall them. Apply brake grease to the appropriate contact points and sliding pins.

Step 7: Rotor Replacement - Remove Caliper

To remove the rear caliper for rotor replacement, you'll typically undo two 17mm bolts, similar to the front. These are often torqued to around 77 ft lbs. Again, use a dead-blow hammer to help loosen stubborn bolts.

Step 8: Rotor Replacement - Loosen the Rotor

The method for removing the rear rotor is often the same as the front: use a 12mm bolt screwed into the threaded holes to pry the rotor off the hub. Be prepared for a loud pop as it releases.

Step 9: Rotor Replacement - Hub Preparation

Clean the hub surface with 220 grit sandpaper to remove any rust or debris.

Step 10: Rotor Replacement - Rubber Plug Transfer

Some rotors have a rubber plug that needs to be transferred from the old rotor to the new one. Ensure you align this plug with the corresponding hole in the hub during installation.

Step 11: Rotor Replacement - Hub Lubrication

It's a good idea to apply a small amount of grease to the hub/rotor mating surface. While new rotors often have protective plating, a thin layer of grease can help prevent them from rusting to the hub in the future, making subsequent removal easier.

Installation is the Reverse of Removal

Reinstall the caliper, ensuring all bolts are torqued to the correct specifications. For rear caliper bracket bolts, the torque is typically around 77 ft lbs.

Important Notes and Torque Specifications

When reinstalling, always ensure you use the correct torque settings. For the front caliper bolts, aim for around 25 ft lbs. For the caliper bracket bolts on the front, it's usually 87 ft lbs. On the rear, the caliper bracket bolts are often torqued to 77 ft lbs. Using the correct torque ensures the components are securely fastened without being overtightened, which could lead to damage.

New Rotor/Pad Break-in Procedure

After replacing pads and rotors, it's crucial to perform a break-in procedure to ensure optimal performance and longevity. This typically involves a series of moderate stops from about 30-40 mph down to 10 mph, without coming to a complete stop. Repeat this 5-10 times. Then, allow the brakes to cool completely before driving at higher speeds. This process beds the pads to the rotors, transferring a layer of pad material to the rotor surface.

Troubleshooting Common Issues

Brake Squeal

If your rear brakes squeal excessively after replacement, it might indicate that the rear anti-squeal clip is worn or needs adjustment. Refer to specific vehicle service information or online forums for guidance on bending or replacing these clips.

Sticking Caliper

If you experience a caliper that seems to be sticking, it could be due to corroded sliding pins or a damaged caliper piston/seal. Ensure the sliding pins are clean, lubricated, and move freely. If the piston is the issue, the caliper may need rebuilding or replacing.

By following these detailed steps, you can confidently remove and reinstall your brake calipers, a vital step in maintaining a safe and reliable braking system for your vehicle.