2009 Lexus LS460 Front vs Rear Brakes: What Wears First and What to Replace

By Core Brake Parts Tech Team — Circleville, OH warehouse

On a 2009 Lexus LS460 the front brakes wear out first, usually well before the rears. The front axle does most of the stopping on a heavy, front-engine sedan like this, so the front pads and rotors take most of the heat and wear. The rears last longer, but they carry an extra job the fronts do not: the parking brake shoes live inside the rear rotor hat, and those deserve a look whenever the rear rotors come off.

How the 2009 LS460 brake system is laid out

Every 2009 LS460 uses four-wheel disc brakes with vented rotors front and rear. What changes from car to car is the rotor size, and that is the first thing to sort out before you order anything. For 2007 to 2009 LS460 and LS460L cars without the Touring Package, the kit specifications list a 13.2-inch front rotor with 1.2-inch nominal thickness and a 12.4-inch rear rotor with 0.8-inch nominal thickness.

Parts catalogs for the 2009 LS460 also list a larger front rotor (357 mm) and a larger rear rotor (335 mm) alongside the standard 315 mm rear, which is why brake kits for this car are split by package. A pad or rotor for one system will not fit the other. The simplest way to confirm which one you have is to measure the rotor diameter or read the part number off the pads you remove.

One common point of confusion: Lexus says the factory Sport Package, with its Brembo brakes, was new for the 2010 model year and was offered only on the rear-wheel-drive LS 460. If a 2009 car has big multi-piston calipers, confirm what is actually on it before buying pads.

Why the front brakes wear first

When you brake, weight shifts forward onto the front tires. The front tires can then carry more braking force, so the system is designed to send most of the work to the front axle. Brake references put the front share at roughly 60 to 90 percent of a car's total braking power, and that is why front rotors and pads are larger and thicker than the rears. On an LS460 you can see it in the numbers above: the front rotor is both bigger and thicker than the rear.

The result is predictable. Front pads get replaced more often than rears, and front rotors see more heat, which is what leads to vibration and uneven wear. Power Stop says it plainly: front pads wear faster because they do most of the work. Plenty of owners go through more than one set of front pads before the rears need attention, but that is not a rule, so measure both axles every time the wheels are off rather than assuming.

Symptoms and how to tell which end is worn

• Brake pad wear warning on the dash: the LS460 uses pad wear sensors. When the warning comes on, inspect both axles, because the light tells you a pad is low but not which one.
• Steering wheel shake when braking: almost always front rotors. The front discs carry most of the heat, so they are the ones that develop uneven thickness.
• Pulsation felt through the seat or brake pedal but not the wheel: points more toward the rears.
• Squeal or grinding: grinding means metal is touching metal. Stop driving on it and inspect right away, since a pad worn to the backing plate will cut the rotor quickly.
• Parking brake that will not hold or needs extra pedal travel: this is the rear parking brake shoes, not the rear pads. They are a separate part and wear on their own schedule.

To check pad thickness, look through the wheel spokes at the outer pad or, better, pull the wheel and check both the inner and outer pads. An inner pad can wear faster than the outer one if a caliper slide is sticking, and you will not see that from outside the wheel.

What to replace, front and rear

Front brake job

For most LS460 owners the front job means new pads and new rotors together. Power Stop recommends replacing pads and rotors as a pair so the new pads can lay down an even friction layer on a fresh surface, and that matters on a heavy car where worn front rotors are the usual source of pedal shake. Shop brake pads for the LS460 and replacement brake rotors matched to your rotor size.

If you want more bite than the stock pads give, our EBC Yellowstuff front brake pads for the LS460 use a compound built for street and track use, with beveled edges and center slots to fight noise, and EBC backs them with a 12-month, 10,000-mile warranty. They are a performance pad, so compare the pad shape to the pads on your car before ordering. For a quiet, low-dust daily pad, look at our ceramic brake pads.

Rear brake job

Rear pads and rotors on the LS460 come apart like any other disc brake, with one extra step: the parking brake shoes sit inside the rear rotor hat. Lexus lists the parking brake shoe set (part 46530-50041) for 2007 to 2017 LS460 models, and rear kits for this car are sold with the shoes included for that reason. With the rotor off, check the shoe lining and the hardware, and back off the parking brake adjuster if the rotor will not slide off.

Always replace pads in axle sets, both sides at once. Power Stop recommends doing both fronts or both rears together, and doing all four when you want the most even braking and a chance to catch a problem hiding on one side.

Replace at the same time

• Pad hardware and abutment clips. New clips cost little and prevent pad drag and noise. See our brake hardware kits.
• Caliper slide pin grease, using a brake-specific lubricant.
• Pad wear sensors if the old ones have contacted the rotor or the warning has come on.
• Brake fluid, if it is dark or past the interval in your maintenance schedule. Use the fluid type printed on the master cylinder reservoir cap.
• A sticking caliper, if one pad wore much faster than its partner. We carry brake calipers for that repair.

How hard the job is and what to watch for

A front pad and rotor job on the LS460 is a reasonable driveway job for someone who has done brakes before. The calipers are large and the rotors are heavy, so plan on a good jack, jack stands, a torque wrench and a tool to push the caliper pistons back. Torque caliper bracket bolts and lug nuts to the values in the factory service manual rather than guessing, since these parts carry a lot of load on a heavy car.

The rear job takes longer because of the parking brake shoes inside the hat. If you are replacing the shoes, work one side at a time so you have the other side to copy from, and adjust the shoes afterward so the parking brake holds without dragging. The LS460 rides on air suspension, so check your owner's manual for the correct lifting procedure before you put the car on stands.

After any brake job, bed the new pads in with a series of moderate stops before hard driving. It spreads an even pad layer on the rotor and helps prevent the vibration that sends many cars back for a second front job.

On recalls: the NHTSA recall database lists two campaigns for the 2009 LS460, one for the fuel delivery pipe and one for the variable gear ratio steering. Neither involves the brakes, so brake wear on this car is a normal maintenance item, not a known defect.

Frequently Asked Questions

Do the front brakes on a 2009 LS460 always wear before the rears?

In normal driving, yes. The front axle does most of the braking because weight shifts forward when you slow down, so the front pads and rotors wear faster. Still measure both axles at every service, because a sticking rear caliper can wear a rear pad early.

Can I replace only the front pads and leave the rears?

Yes, as long as the rear pads and rotors are still within spec. Replace pads in axle pairs, left and right together, and check the rears at the same visit.

Should I replace rotors every time I replace pads?

On the front of an LS460 it is usually worth it, because worn or uneven front rotors cause the steering wheel shake owners complain about. Power Stop recommends pads and rotors together for even, long-lasting braking.

Why will my rear rotor not come off?

The parking brake shoes inside the rotor hat can hold it, especially if a lip has worn into the drum surface. Make sure the parking brake is released and back off the shoe adjuster before pulling the rotor.

How do I know which size brakes my LS460 has?

Measure the rotor diameter or compare the part numbers on your old pads. The 2007 to 2009 cars without the Touring Package use the 13.2-inch front and 12.4-inch rear rotors; cars with the larger system use bigger rotors and different pads.

Are there any brake recalls on the 2009 LS460?

The NHTSA recall list for the 2009 LS460 shows two recalls, for the fuel delivery pipe and the steering system. Neither covers the brakes.

Sources

1. Power Stop Z23 kit listing, LS460 2007-2009 without Touring Package - front 13.2 in. x 1.2 in. and rear 12.4 in. x 0.8 in. rotor specs
2. AllRotors 2009 Lexus LS460 catalog - 357 mm front and 315 mm / 335 mm rear rotor options
3. AllRotors: which brakes are more important, front or rear - front brakes supply roughly 60 to 90 percent of braking and use larger rotors and pads
4. Power Stop brake pad FAQ - front pads wear faster; replace in axle sets; pads and rotors together
5. Lexus parts catalog: LS460 parking brake shoe - part 46530-50041 fits 2007-2017 LS460
6. TRQ LS460 rear kit with parking shoes - rear kit includes parking brake shoes; 315 mm vented rear rotor
7. Lexus Newsroom: revised LS 460 - Sport Package with Brembo brakes first offered for 2010, RWD only
8. EBC Yellowstuff DP41867R product details - pad design and 12-month, 10,000-mile warranty
9. NHTSA recalls for 2009 Lexus LS460 - two recalls, fuel pipe and steering, none for brakes