Clicking Noise When Braking: What It Means

By Core Brake Parts Tech Team — Circleville, OH warehouse

A single click when you press the brake pedal, especially at low speed or the first stop after changing between drive and reverse, is most often a brake pad shifting inside its caliper bracket and tapping the abutment. It is common, usually not dangerous, and normally fixed with new pad hardware and the right lubricant. A click or clunk that is loud, repeats on every stop, or comes with a pull, a vibration or a change in pedal feel points to something loose, and that needs an inspection before you keep driving.

Why Brakes Click: Pad Movement in the Caliper

On most modern cars and trucks the brake pads ride in a caliper bracket (sometimes called the anchor or mounting support). The pad ears sit on stainless steel abutment clips, and the pads need a small running clearance so they can slide freely as they wear. That clearance is also the source of the most common click.

When you brake, the spinning rotor drags the pads in the direction of rotation until the pad backing plate lands against one end of the bracket. Change direction, from forward to reverse or back again, and the next brake application pulls the pads to the opposite end. That short trip across the clearance ends in a metal-on-metal tap you hear as a click.

Automakers have documented exactly this. Porsche service information for the 2018-2019 Cayenne describes a clicking noise from the front axle when changing direction of travel or braking suddenly at low speed, and states the cause as the brake pads hitting against the caliper during load or direction changes. The remedy was new rubber-coated retainer springs for the pads. Mazda bulletins for the 2013-2023 CX-5 and 2016-2023 CX-9 describe a click when first moving forward or reverse from a stop, or when first applying the brakes at slow speed, caused by deteriorated grease between the pads and shims that lets the pads move to the other side of the caliper on the next application.

The takeaway: some clearance is designed in, but worn clips, tired retainer springs and dried-out lubricant turn a silent shift into an audible one.

Other Causes of Clicking When Braking

Not every click is a shifting pad. Work through these possibilities, roughly from most to least common.

Deformed pad retainers

Mitsubishi issued a bulletin for the 2022-2024 Outlander and 2023-2024 Outlander Plug-in Hybrid covering noise from the front caliper when braking or turning. Its background explains that the front pad retainers had low rigidity and moved with the pads during braking, which could deform them until they touched the rotor. The fix was an improved pad clip kit, cleaning brake dust from the caliper, and applying anti-friction lubricant to the specified contact areas before reinstalling the pads.

Loose caliper hardware

Power Stop notes that when guide pins and bolts are not secured, the caliper can bounce and produce a popping or clicking sound, and that loose pads can shift and jump when you brake. R1 Concepts adds that loose guide pins let the caliper shift noticeably on each application and that worn caliper bushings produce similar symptoms. This is the version of the noise you should not ignore, because a caliper that is moving on its mounts is not being held where it should be.

Clicks that are not the brakes at all

Some clicks happen during braking but come from elsewhere. A GM bulletin for the 2017-2019 Buick Enclave, Cadillac XT5, Chevrolet Traverse and GMC Acadia traced a front clicking noise during throttle tip-in and tip-out or low-speed turns to drive axle nut torque or movement between the wheel mounting face and the brake rotor hat, and it starts by checking lug nut torque. Ford found a ting, pop or click from the wheel hubs of the 2022-2023 F-150 Lightning when accelerating, braking or shifting between drive and reverse, caused by stick-slip between the hub and halfshaft, and added a washer at that joint. Power Stop also lists loose hubcaps, worn CV joints and tie rods as sources of clicks and pops, particularly when turning.

ABS self-check noise

If you hear a clunk from under the hood right after starting the engine, or just after the vehicle begins to move, that may be the anti-lock brake system checking itself. Toyota's tech tip for the 2018-2019 Sequoia quotes the owner's manual: a sound may be heard from the engine compartment when the pedal is pressed repeatedly, when the engine starts, or just after the vehicle starts moving, and it does not indicate a malfunction. Your own owner's manual is the place to confirm whether your vehicle does this.

How to Diagnose Where the Click Is Coming From

1. Note the pattern. Does it click once per stop, only after switching between drive and reverse, only when turning, or only once after start-up? A once-after-direction-change click is classic pad shift. A once-per-drive clunk from the engine bay suggests ABS self-check. Clicks while turning without braking point away from the brakes.
2. Find the corner. In an empty lot with the windows down, roll forward, brake gently, then reverse and brake again. Have a helper listen outside if you can.
3. Check the lug nuts. Loose wheels click and are dangerous. Tighten to the specification in your owner's manual with a torque wrench.
4. Inspect with the wheel off. Look for missing, cracked or rusted abutment clips, pads that rattle in the bracket by hand, a pad backing plate with shiny wear marks, and a bent dust shield. Try to rock the caliper: it should slide on its pins, not clunk on its mounting bolts.
5. Check the pins and boots. Guide pins should slide smoothly without binding or excess play, and the rubber boots should be intact. Torn boots let water in and lead to corrosion and sticking.
6. Look at the pads and rotors. Uneven wear between inner and outer pads, or a heavily rusted rotor face, means the service should be more than just clips.

The Fix and Which Parts to Buy

For a pad-shift click, the repair is a proper pad service rather than a spray of lubricant through the wheel.

• Replace the hardware every pad job. Power Stop's advice for clicks when changing direction is to use new hardware every time and lubricate the clips with a high-performance synthetic brake lubricant. Stainless abutment clips lose their tension and wear grooves where the pad ears ride. Many of the Power Stop brake kits we carry include hardware and lubricant in the box.
• Clean before you lubricate. Wagner's noise guidance calls for replacing worn anti-rattle clips, springs and pins, cleaning corroded guide pins, and cleaning the caliper contact surfaces so the pads align properly. Rust under a clip can hold the pad at an angle and cause noise even with new hardware.
• Use the right lubricant in the right place. Lubricate where the pad ears ride on the clips and where the manufacturer specifies, typically the guide pins with a compatible brake grease. Follow the pad maker's instructions on shims: Wagner, for example, says its pads with a sound insulator should have no chemical compound on the insulator area. Never let grease reach the friction surface or the rotor face.
• Replace the pads if the backing plates are worn or the pads are low. Quality ceramic brake pads with multilayer shims fit tightly and resist noise.
• Fix loose calipers properly. Tighten caliper bracket and guide pin bolts to the factory service manual torque. If the pins are corroded or the bushings are worn, replace them or the caliper.

What to Replace at the Same Time

If you are pulling the pads to cure a click, check the rotors. Both Mazda bulletins note that rust on the rotor surface can cause separate noise and vibration, and their procedure was to machine the rotors within their limits or replace them along with the pads. Rotors that are rusted, grooved or below minimum thickness (stamped on the rotor or listed in the service manual) should be replaced; browse brake rotors or pair them with new brake pads. Replace torn guide pin boots, and inspect the brake hoses for cracks while the wheel is off. Always service both sides of an axle together.

How Hard Is the Job?

Replacing pad hardware and lubricating the caliper is a basic job for a home mechanic with jack stands, a torque wrench and basic hand tools. Plan on doing one axle at a time. The critical steps are cleaning the bracket where the clips sit, lubricating only the correct surfaces, torquing the caliper bolts and wheel lug nuts to specification, and pumping the pedal to seat the pads before driving. Bed in new pads per the pad maker's instructions; Wagner's published procedure, for instance, uses a series of light slow-downs with cooling time between them.

If the click is a clunk that comes with a pull, a pedal that feels different, a loose caliper you cannot get tight, or a noise from the hub rather than the brake, have the vehicle inspected before driving further.

Frequently Asked Questions

Is a clicking noise when braking dangerous?

A single light click when you first brake after changing direction is usually pad movement and not an immediate safety problem, though it tells you the hardware is worn. A loud clunk on every stop, a pull, or a click from a loose wheel or caliper is a safety issue and needs inspection right away.

Why do my brakes click when I back up?

The pads rest against one end of the caliper bracket when you brake going forward. The first brake application in reverse drags them to the other end, and they tap the bracket. Worn clips or dried lubricant make that tap audible.

Why do my new brake pads click?

The usual reasons are reused abutment clips, missing or incorrectly installed shims or clips, no lubricant on the clip contact points, or rust left on the bracket under the clips. Loose caliper or guide pin bolts cause a heavier clunk. Reinstall with new hardware on a clean bracket and torque everything to specification.

Can I stop the click by spraying lubricant on the brakes?

No. Spray lubricants can contaminate the pads and rotors and reduce braking. The fix is to remove the pads, clean the bracket, install new clips and apply brake lubricant only to the specified contact points.

Is a clunk from under the hood when I start driving the brakes?

It may be the ABS system performing its self-check. Several manufacturers describe a sound from the engine compartment right after start-up or when the vehicle first moves as normal. Check your owner's manual, and have the system scanned if the ABS warning light stays on.

Sources

1. Porsche Technical Information 88/18 (Cayenne), via NHTSA - clicking when changing direction caused by pads hitting the caliper; new retainer springs
2. Mazda CX-5 brake noise bulletin, via NHTSA - click when first moving forward or reverse from deteriorated pad-to-shim grease; rotor rust noise
3. Mazda CX-9 brake noise bulletin, via NHTSA - same pad-shift click condition on the CX-9; machine or replace rusted rotors with pads
4. Mitsubishi TSB-24-35-001 (Outlander), via NHTSA - low-rigidity pad retainers deform and cause noise; improved clip kit and lubricant
5. GM Service Bulletin 18-NA-043, via NHTSA - front clicking from axle nut torque or wheel-to-rotor interface; lug nut torque check
6. Ford TSB 22-2395 (F-150 Lightning), via NHTSA - hub-to-halfshaft click during torque reversals when braking or shifting
7. Toyota Tech Tip T-TT-0538-19 (Sequoia), via NHTSA - engine compartment sound at start-up or move-off from ABS is normal
8. Power Stop: Why Do My Brakes Click When Changing Direction? - worn abutment clips, new hardware and synthetic lubricant; loose pads and calipers
9. Wagner Brake: Brake System Noise Troubleshooting Tips - replace worn clips, springs and pins; clean contact surfaces; shim and insulator lubricant guidance
10. R1 Concepts: Brake Caliper Noise Causes and Fixes - loose guide pins and worn bushings let the caliper shift and click