Silverado and Sierra 1500 Brake Rotor Sizes by Year (2014-2026): Which Kit Fits Yours

Half-ton Silverado and Sierra brake rotors changed size in 2019. The 2014–2018 trucks use a 330 mm (13.0 in) front rotor and a 345 mm (13.6 in) rear. The 2019–2026 trucks use a 343 mm (13.5 in) front and keep the 345 mm rear. Every 1500 in that span is 6-lug on a 6x139.7 mm pattern.

That 13 mm difference up front is exactly why so many rotor orders come back. The listing says "Silverado 1500," the bolt pattern matches, the box looks right — and then the caliper bracket will not close over the friction ring. Below is the year-by-year breakdown, the measurements you can take in your driveway to confirm it, and the parts you need for the whole job. If you are replacing rotors this weekend, start with brake rotors and hardware for your Silverado or Sierra 1500 and filter by your model year before anything else.

Parts and tools you'll need

• Rotors, pads, and caliper hardware for your 2014–2026 Silverado or Sierra 1500 — buy the pads and the abutment clips with the rotors, not later
• Chevrolet Silverado brake and chassis parts or GMC Sierra brake and chassis parts, depending on which badge is on your tailgate
• Copper paste for the pad abutments — GM specifies it whenever pads come out. See the section below.
• A vernier or dial caliper (a $20 digital caliper is fine) and a tape measure
• A torque wrench that covers 140 lb-ft, a 22 mm socket, and a 15 mm and 18 mm socket for the caliper and bracket bolts

What size are the brake rotors on a Silverado or Sierra 1500?

Front rotors are 330 mm on 2014–2018 trucks and 343 mm on 2019–2026 trucks. Rear rotors are 345 mm across both generations. All of them are 6-lug. The front change happened when GM moved from the K2XX platform to the T1XX platform for the 2019 model year, and the two front rotors are not interchangeable.

The rear rotor being the same diameter across both generations is the part that trips people up. Somebody buys a "2014–2018 and 2019–2024" universal four-wheel kit, installs the rears without a problem, gets to the fronts, and discovers the kit was actually built around one generation. Confirm the front separately from the rear, every time.

One more note before the table: rotor diameter is the outside diameter of the friction ring, not the overall part. A 343 mm rotor and a 345 mm rotor look identical sitting on a bench. Two millimeters is about the thickness of a nickel. You will not eyeball this — measure it.

Silverado and Sierra 1500 rotor sizes by year

Here is the chart. It covers the two current half-ton generations plus the outgoing GMT900 trucks, because those still show up in the same search results and share the 6x139.7 bolt pattern, which is how people end up ordering the wrong thing.

Two traps hide in that table. The first is the 2019 model year itself. GM sold the old body and the new body side by side in 2019 under the names Silverado 1500 LD and Sierra 1500 Limited. If your 2019 truck has the older dashboard and the door handles that sit flush in a black bezel, you have the LD/Limited and you need 2014–2018 parts, not 2019+ parts. Check the eighth digit of the VIN and the build date sticker in the driver's door jamb if you are unsure.

The second trap is 2022. The Silverado 1500 LTD was the last of the old-interior T1XX trucks, sold alongside the refreshed 2022 Silverado 1500. Brake hardware carried over between them — the interior changed, the front rotor did not — but listings often split them out, so search both names.

Why did GM change the front rotor in 2019?

The T1XX trucks got a larger front rotor because they got more capable. Higher tow ratings, more trim variants with 22-inch wheels, and a broader engine lineup all push more heat into the front brakes. Going from 330 mm to 343 mm adds swept area and thermal mass without requiring a bigger wheel.

The practical consequence for you is that the caliper and the caliper bracket changed with it. This is not a case where you can bolt the bigger rotor onto the older truck and gain something. The bracket locates the caliper at a fixed radius from the hub centerline, and a 2014–2018 bracket puts the pads 6.5 mm too far inboard for a 343 mm rotor. The pad would ride off the outer edge of the friction ring.

People do convert older trucks to the larger brakes, and it is a real swap — but it requires the matching knuckle, bracket, caliper, and rotor as a set, and it is outside the scope of a normal pad-and-rotor job. If you just want your truck to stop better, better pads and fresh fluid get you most of the way there for a fraction of the cost.

How do I measure my rotors instead of trusting a chart?

Measure the outside diameter of the friction ring with a tape measure across the center of the hub, then measure thickness with a caliper about 10 mm in from the outer edge. Diameter tells you which rotor to buy. Thickness tells you whether the one on the truck is done. Both take about ninety seconds per corner with the wheel off.

1. Park on level ground, chock the rear wheels, and break the lug nuts loose before you lift anything.
2. Raise the corner and support it on a jack stand rated for the weight. A floor jack alone is not a support device. Do not put any part of your body under the truck until it is on stands.
3. Remove the wheel. Lay a tape measure across the face of the rotor, through the center of the hub, and read the outside edge of the friction ring to the outside edge on the other side. You are looking for roughly 13.0 in versus 13.5 in up front — a half inch is easy to see even with a sloppy measurement.
4. Set your caliper to measure thickness roughly 10 mm inboard of the outer edge, past the lip of ridge that wear leaves behind. Take three readings around the rotor and use the smallest.
5. Look at the rotor hat — the raised center section. GM casts the minimum thickness right into it. If it is legible under the rust, that number beats anything you read online.
6. Write down what you measured before you go to the computer. Do not measure and shop at the same time; that is how confirmation bias sells you the wrong rotor.

If you are measuring because something sounds wrong rather than because you are on a maintenance schedule, spend five minutes first working out what the noise your brakes are making actually indicates. A grind and a squeal point at different parts, and the fix for one is not the fix for the other.

What is the minimum thickness before I have to replace a rotor?

For 2014–2018 half-tons, the front rotor discard thickness is 1.102 in (28 mm) from a 1.181 in (30 mm) new thickness, and the rear is 0.728 in (18.5 mm) from 0.787 in (20 mm) new. The 2019–2026 front rotor uses the same 30 mm new and 28 mm discard figures. Below discard, the rotor gets replaced — it does not get machined.

Rear rotor thickness figures vary more between sources and between model years than the front figures do. Read the number cast into your own rotor hat before you decide to machine anything, and if it is unreadable, replace rather than resurface.

That last row is the one nobody measures and it is the one that causes the complaint. Thickness variation — the difference between the thickest and thinnest point around one rotor — is what you feel as a pulsation in the pedal. Seven ten-thousandths of an inch is a very tight tolerance. It is also why a rotor that measures fine for thickness can still need to come off.

Should I resurface these rotors or just replace them?

Replace them. GM's factory half-ton rotors carry a ferritic nitrocarburized (FNC) surface treatment for corrosion resistance, and turning a rotor on a lathe removes that layer entirely. You end up with a thinner rotor that also rusts faster, for a labor charge that is often close to the price of a new one.

This is one of those cases where the industry's old advice has quietly stopped being correct. Resurfacing made sense when rotors were heavy, expensive castings and machine time was cheap. On a modern half-ton with coated rotors, the math does not work. If the rotor is scored, pulsing, or under spec, buy a new one.

The step that stops the new brakes squealing

New rotors and pads that squeal within a week are usually missing one thing, and it is not a part most people know to buy.

GM's service bulletin 17-NA-040 instructs technicians to apply copper paste to the pad backing plate abutments — the ends of the pad that contact the caliper bracket — covering the abutment area completely with roughly 0.10 g (0.0035 oz) at each end. The paste must never extend onto the friction material.

GM says to apply it whenever the pads are removed or replaced, not only when chasing a noise complaint. That makes it part of a rotor job, not an optional extra.

Two things worth knowing alongside it. Pressure washing removes it — GM warns that wheel cleaners or a power washer aimed at the caliper can wash the paste off and that it may need reapplying, which is why a squeal sometimes appears right after a detail. And for that particular condition — a squeal on the first few applies after the truck has sat, at low speed and light pedal, clearing after a handful of stops — GM's instruction is explicitly not to replace the pads.

Do Tahoe, Suburban, Yukon and Escalade rotors interchange with the 1500?

From 2021 forward, yes on the front. The 2021–2026 Tahoe, Suburban, Yukon, Yukon XL, Escalade and Escalade ESV share the 343 mm front rotor with the 2019–2026 Silverado and Sierra 1500. Earlier full-size SUVs on the K2XX platform share the 330 mm front rotor with 2014–2018 trucks.

The reason is simple: those SUVs moved to the T1XX architecture for the 2021 model year, one generation after the pickups. So a 2020 Tahoe is a K2XX-family vehicle and a 2021 Tahoe is not, even though they look related from twenty feet away. If you are shopping by "Tahoe rotor" without a year, you have a coin flip.

Rear brakes are where this interchange gets less reliable. The full-size SUVs went to an independent rear suspension in 2021 with different rear brake hardware, and parking brake configuration differs as well. Verify the rear by part number and by measurement, not by assuming it follows the front.

What fits a Trail Boss, AT4, ZR2 or a truck with the Max Trailering package?

Off-road and trailering trims run the same rotor diameters as the rest of the half-ton line for their model year — the lift and the tires change, the brake rotors do not. Where option packages can differ is in pad compound and, on some builds, caliper hardware. Verify your specific truck by RPO code before ordering pads.

Your RPO codes are on a sticker, usually in the glovebox or on the inside of the center console lid on these trucks. It is a grid of three-character codes. Brake-related RPOs start with J. If you want to know exactly what your truck left the factory with, that sticker is the source of truth, and it costs you nothing to photograph it with your phone before you order.

Do not assume a heavier-duty pad is the upgrade. Aggressive pad compounds bite harder when hot and worse when cold, and most half-tons spend their lives cold. Unless you tow near the truck's rating regularly or run mountain grades, the standard ceramic pad is the right choice and the cheap option really is fine here.

What about the 2500HD and 3500HD?

Heavy-duty trucks are a different conversation entirely. They use 8-lug hubs, larger rotors, and different calipers, and nothing in the chart above applies to them. If your truck has eight lug nuts per wheel, stop reading this table and shop by the specific 2500HD or 3500HD year and body style.

The confusion here is understandable, because listings frequently write "Silverado" without the trailing number and let the fitment widget sort it out. When the widget is wrong — and it is wrong often enough — you have a box of rotors that will not clear anything. Count your lugs first.

How tight do the wheels go back on?

GM specifies 140 lb-ft (190 Nm) for half-ton Silverado, Sierra, Tahoe, Suburban, Yukon and Escalade wheel nuts, on M14×1.5 studs with a 22 mm socket. Torque in a star pattern, in two passes, with clean dry threads. Then verify against the placard in your driver's door jamb, because that placard is specific to your truck.

Three things ruin more studs than anything else on these trucks. First, an impact gun — a mid-range cordless impact delivers well over 400 lb-ft on burst, and 140 lb-ft is the target. Second, anti-seize or oil on the threads, which turns a correct torque reading into a badly over-clamped joint. Third, aftermarket wheels with conical seats and factory lug nuts, which never develop proper clamping force no matter how hard you pull.

Re-torque after 50 to 100 miles, particularly on aluminum wheels. It takes four minutes and it is the cheapest insurance in the entire job.

A short safety note

Brakes are a system where "close enough" has consequences. Support the truck on rated jack stands, never on a jack alone or on cinder blocks. Do not reuse a caliper bracket bolt that has visible thread damage. Bed the new pads in properly before the first hard stop — a series of moderate stops from about 35 mph, without coming to a complete halt, is the usual method and the pad manufacturer's instructions override anything you read here. And if the pedal goes soft or the truck pulls under braking after the job, stop driving it and find out why.

Coated, drilled, or slotted — which rotor do you actually want?

For a street-driven half-ton, a plain coated rotor. Cross-drilling was developed to vent gases from 1960s pad materials that no longer exist, and on a heavy truck it mostly adds crack initiation sites. Slots have a narrower real benefit and cost pad life. Coating the non-friction surfaces, on the other hand, does something you will notice every time you look at your wheels.

If you tow heavily, the useful upgrade is not a pattern of holes. It is more thermal mass, a pad compound rated for the heat you are actually generating, and fresh high-temperature brake fluid. Fluid is the most overlooked item on that list — it absorbs moisture, and moisture is what gives you a long pedal on the fourth stop down a grade.

If you are working through the rest of the front end while you have the wheels off, there are more GM parts and fitment guides covering the systems that tend to fail alongside brakes. Wheel bearings and rotors, in particular, are a common pair.

What to check before you order

1. Count the lugs. Six means half-ton and this guide applies. Eight means HD and it does not.
2. Pin down the generation, not just the year. 2019 and 2022 both had two different trucks sold under similar names. Check the body, the VIN, and the door jamb build sticker.
3. Measure the front rotor. 13.0 in means 330 mm and a 2014–2018 part. 13.5 in means 343 mm and a 2019+ part.
4. Measure thickness at three points and compare to the number cast into the rotor hat, not to a number from the internet.
5. Order pads, rotors, and hardware together, and add copper paste for the abutments while you are at it.
6. Confirm the rear separately from the front. They follow different rules across these generations.
7. Have a torque wrench before you start, not after. And read the door jamb placard rather than trusting a generic figure.

Frequently Asked Questions

What size are the front rotors on a Silverado 1500?

330 mm (13.0 in) on 2014–2018 trucks and 343 mm (13.5 in) on 2019–2026 trucks. The change came with the move from the K2XX to the T1XX platform for 2019, and the two are not interchangeable because the caliper bracket locates the pads at a different radius.

Are the front and rear rotors the same size on a Silverado 1500?

No. Rear rotors are 345 mm across both generations, so on a 2014–2018 truck the rear is larger than the front, and on a 2019–2026 truck they are within 2 mm of each other. Confirm the front and rear separately — a kit that fits your rears does not prove it fits your fronts.

My truck is a 2019. Which parts do I need?

That depends on which 2019 you have, because GM sold two. The Silverado 1500 LD and Sierra 1500 Limited were the carryover old-body trucks and take 2014–2018 parts. The new-body 2019 takes the 343 mm front rotor. Check the eighth VIN digit and the build sticker in the driver's door jamb before ordering.

Can I fit the bigger 2019 front rotors on my 2018 truck?

Not as a rotor swap. The caliper bracket positions the pads at a fixed radius, and a 2014–2018 bracket puts them roughly 6.5 mm too far inboard for a 343 mm rotor, so the pad would ride off the outer edge. A genuine conversion requires the matching knuckle, bracket, caliper and rotor as a set. Better pads and fresh fluid deliver most of the improvement for far less money.

How thin is too thin on a Silverado brake rotor?

Discard thickness is 1.102 in (28 mm) on the front, from 1.181 in (30 mm) new. The number cast into your rotor hat is authoritative for your specific part. Measure at three points around the rotor and use the smallest reading, taken about 10 mm inboard of the outer edge so you are past the wear ridge.

Should I have my rotors resurfaced?

No. GM's factory half-ton rotors carry a ferritic nitrocarburized coating for corrosion resistance, and machining removes it entirely. You end up with a thinner rotor that rusts faster, for a labor charge close to the price of a new one. Resurfacing made sense when rotors were expensive castings; on a modern coated rotor the maths no longer works.

Why does my pedal pulse when the rotors measure fine?

Because thickness and thickness variation are different measurements. The variation spec is 0.0007 in — seven ten-thousandths — between the thickest and thinnest point around one rotor. A rotor can pass a thickness check and still be well outside that, and the variation is what you feel through the pedal.

Why did my new brakes start squealing?

Most often because the pad abutments were not treated. GM specifies copper paste on the pad backing plate abutments whenever pads are removed or replaced — roughly 0.10 g at each end, never on the friction material. It also warns that a power washer aimed at the caliper can wash that paste off, which is why squeals sometimes appear right after a wash.

Do Trail Boss, AT4 and Max Trailering trucks use different rotors?

No, the rotor diameters are the same as the rest of the half-ton line for that model year. The lift and tyres change; the brakes do not. Pad compound and some caliper hardware can differ by option package, so check the RPO sticker in your glovebox before ordering pads.

What torque do the wheel nuts take?

140 lb-ft (190 Nm) on M14×1.5 studs with a 22 mm socket, in a star pattern, on clean dry threads, then verified against the placard in your door jamb. Do not use anti-seize on the threads, do not finish with an impact gun, and re-torque after 50 to 100 miles — particularly on aluminium wheels.

A Note on Sourcing

The copper paste specification, the quantity, the pressure-washing warning and the instruction not to replace pads for that condition come from GM service bulletin 17-NA-040, August 2020 revision (PDF), published by NHTSA as a manufacturer communication and read directly.

Rotor diameters, thickness specifications and platform boundaries come from GM parts catalogue and service specification data. Rear rotor thickness figures vary more between model years and sources than the front figures do, which is why this page tells you to read the number cast into your own rotor hat rather than relying on the table.

The lug nut figure is consistent across the full-size platform and is confirmable in your owner's manual and on the door jamb placard. Caliper fastener torques are not consistent and are deliberately not given here.

The rotor type recommendations, the pad compound guidance and the resurfacing position are our own, based on service experience rather than manufacturer instruction.

If the noise that started this project is still not identified, it is worth reading through the brake noise diagnosis walkthrough before you spend money. Replacing rotors will not quiet a bad wheel bearing.

Will these rotors fit your truck?

Check your year, model, and generation before you order — the 2019 changeover and the 2019 LD/Limited overlap are where most wrong-part returns come from. Confirm six lugs, measure your front rotor, and then filter GM brake rotors, pads and hardware to your exact truck. Silverado owners can start from Chevrolet Silverado parts; Sierra owners from GMC Sierra parts.