Brake Pad Replacement: Procedure, Tools and Time Required

The Short Answer and Its Scope

This guide covers the general procedure for hydraulic disc brakes, the layout used on most modern passenger cars. It does not cover drum brakes, which use shoes rather than pads. It does not cover opening the hydraulic system, such as replacing hoses or calipers and bleeding the brakes. It also does not cover the service routines for electronic parking brakes or brake-by-wire systems.

Several factors change the job from one vehicle to the next:

Front versus rear axle: Rear calipers with an integrated mechanical parking brake often need the piston wound back with a rotating tool rather than pushed straight in. Electronic parking brake: Many recent models need a scan tool or a dashboard service mode to retract the rear caliper motors before the pistons can move. Caliper type: Floating (sliding) calipers and fixed multi-piston calipers come apart differently. Model year, generation and trim: Bolt sizes, hardware kits, wear-sensor wiring and tightening values all differ, sometimes even within the same model line.

Because of these differences, confirm every specific detail against the service information for your exact vehicle before you start. That includes fastener sizes, torque values, fluid type and any electronic procedure. This article does not supply vehicle-specific specifications.

How Long Brake Pad Replacement Takes

No verified timing data was available for this article, so it gives no specific figure. Several factors determine how long the job takes:

How many axles are being serviced; Whether the rotors are also being replaced or measured; Whether the rear brakes need piston wind-back or an electronic parking brake procedure; How seized or corroded the caliper bolts, slide pins and pad hardware are; Your familiarity with the vehicle and access to the correct tools

For a realistic estimate on your vehicle, you can check the labor time a repair shop or dealer quotes for the job. Allow extra time on a first attempt.

Tools and Parts You Will Typically Need

The exact list depends on the vehicle. A typical DIY brake pad replacement calls for the following:

Replacement brake pads specified for your vehicle and axle, plus any new hardware such as clips, shims or wear sensors supplied or recommended for it; A jack and jack stands rated for the vehicle, plus wheel chocks; A lug wrench or socket and breaker bar for the wheel nuts; Sockets or wrenches that fit the caliper and bracket bolts, which may include hex or Torx bits on some vehicles; A torque wrench covering the ranges given in the service information; A caliper piston tool: a C-clamp or piston spreader for push-back pistons, or a wind-back tool for rear calipers with an integrated parking brake; A scan tool, if the vehicle has an electronic parking brake that needs a service mode; Brake cleaner, a wire brush and lint-free rags; High-temperature brake lubricant approved for caliper slide pins and pad contact points; A micrometer or vernier caliper if you plan to measure rotor thickness; Gloves and eye protection

Step-by-Step: How to Change Brake Pads

1) Prepare the Vehicle and Work Area

Park on firm, level ground and set the parking brake, unless you are working on rear brakes with an electronic parking brake that must be put into service mode first. Chock the wheels that will stay on the ground. If the brakes have just been used, let them cool. Check the brake fluid reservoir level now. Pushing the pistons back later will raise the level, and the reservoir can overflow if it is already full.

2) Loosen the Wheel Nuts and Lift the Vehicle

Break the wheel nuts loose while the tire is still on the ground. Raise the vehicle only at the lift points shown in the owner's manual or service information. Then support it on jack stands placed at the specified support points. Never work under or beside a vehicle held up only by a jack.

3) Remove the Wheel and Inspect the Brake Assembly

Remove the wheel. Before taking anything apart, look over the assembly:

Check for fluid leaks at the caliper and hose. Check for a cracked, swollen or chafed brake hose. Check for torn piston or slide-pin boots. Check for uneven pad wear. Check the rotor surface for cracks, deep grooves or heavy scoring.

Brake dust can be harmful to breathe. Do not blow it off with compressed air. Instead, clean with brake cleaner and wipe up the residue. If you find a leak, a damaged hose or a sticking caliper, stop at this point and have the brakes checked professionally. Those faults go beyond a pad replacement.

4) Release the Caliper

On most floating calipers, you remove the caliper guide bolts (slide-pin bolts) and then lift or pivot the caliper off the pads. Fixed calipers usually release their pads through retaining pins without coming off the bracket. If the pads have wired wear sensors, unplug the sensors first. Support the caliper on a hook, wire or the suspension. Do not let it hang by the brake hose, and do not twist the hose. Do not press the brake pedal while the caliper is off, because the piston can be pushed out.

5) Remove the Old Pads and Hardware

Take out the pads, noting which way each one faces and where any shims or wear indicators sit. Remove the abutment clips or other pad hardware. If new hardware came with the pads, discard the old pieces. Clean the caliper bracket where the pads seat, removing rust and debris so the new pads can slide freely.

6) Check the Rotors

Measure the rotor thickness and compare it with the minimum thickness given by the manufacturer. That figure is often stamped on the rotor itself. Replace rotors that are below the minimum or that are cracked or badly scored, and do it in axle pairs. Removing the rotor usually means taking off the caliper bracket. Its bolts often have their own torque specification and may call for thread-locking compound. Confirm both points in the service information.

7) Retract the Caliper Piston

Push the piston fully back into the caliper bore so the thicker new pads will fit. Use a piston tool or clamp and an old pad to spread the force evenly. Watch the fluid reservoir as you go, and remove excess fluid if it approaches the top.

Rear calipers with an integrated mechanical parking brake usually need the piston turned while you press it in, using a wind-back tool. Forcing it straight back can damage the mechanism. Vehicles with an electronic parking brake usually need the motors retracted with a scan tool or a manufacturer-specified service mode before the piston will move. If you do not have the correct tool or procedure, leave this step to a professional.

8) Clean and Lubricate the Slide Points

Remove the caliper slide pins, clean them, and check that they move freely in their boots. Apply a thin coat of brake-approved high-temperature lubricant to the pins and to the points where the pad backing plates touch the bracket or clips, following the pad or vehicle maker's guidance. Keep lubricant and cleaner off the pad friction material and the rotor braking surfaces.

9) Install the New Pads

Fit the new hardware first, then the new pads, each in its correct position. Pads with a wear indicator or sensor often have to go on a specific side, inner or outer. Reconnect any wired wear sensor. Some manufacturers specify a new sensor whenever pads are replaced, so check that requirement for your vehicle.

10) Refit the Caliper and Tighten to Specification

Put the caliper back over the pads and install the guide bolts or retaining pins. Tighten them to the torque value in the service information for your vehicle. These values vary by model, and this article does not provide them. Some manufacturers specify new bolts or thread-locking compound. Repeat the procedure on the other side of the same axle. Pads should always be replaced as a full axle set.

11) Refit the Wheels and Lower the Vehicle

Refit the wheel and snug the nuts in a star or crisscross pattern. Lower the vehicle, then tighten the nuts to the manufacturer's specified torque with a torque wrench, again in a crisscross pattern. If you used an electronic parking brake service mode, exit it as the vehicle procedure directs.

12) Restore Pedal Pressure and Check Fluid

Before moving the vehicle, pump the brake pedal until it feels firm. This moves the pistons back out against the new pads. Skipping this step can leave you with little or no braking on the first press. Then check the fluid reservoir and correct the level to the marked range, using only the fluid type specified for the vehicle.

Completion Checks

Before returning the vehicle to normal use, confirm each of the following:

The brake pedal is firm and high, with no sponginess or sinking. The brake fluid is within the marked range and there are no leaks at either caliper. All caliper, bracket and wheel fasteners have been torqued to the manufacturer's values. The wheels turn without heavy drag once the vehicle is lifted or rolled. No brake, ABS or parking-brake warning lights remain on. The parking brake holds the vehicle.

Next, bed in the new pads, which transfers an even layer of pad material onto the rotor. Follow the procedure recommended by the pad manufacturer, because routines differ between pad types. Test the brakes at low speed in a safe, open area first. If the pedal feels wrong, the vehicle pulls to one side, or you hear grinding, do not drive further. Have the brakes inspected.

When to Use a Professional Instead

Pad replacement is one of the more approachable brake jobs, but some situations call for a qualified technician:

You find leaking fluid, a damaged hose or a seized caliper or piston. The rear brakes use an electronic parking brake and you lack the scan tool or the documented service procedure. The brake system has been opened and needs bleeding. Warning lights stay on after the job, or the pedal stays soft. You cannot lift and support the vehicle safely, or you lack a torque wrench and the specified values. You have any doubt about the work, since brakes are critical to safety.

Using Brake Pad Replacement Videos

Videos can make the general sequence easier to follow, especially for seeing how a caliper or a set of clips fits together. Choose one that shows the same model, generation and axle as your vehicle. Treat any torque values, fluid types or electronic procedures shown in a video as unverified until you have checked them against the manufacturer's service information.

Information Gaps in This Guide

This guide does not include fastener torque values, minimum rotor thickness, brake fluid specifications, electronic parking brake procedures or a measured job time. All of these depend on the specific vehicle and were not available as verified data. Get them from the service manual or manufacturer information for your vehicle's model year, generation and trim.