2005-2012 Acura RL Brake Job Guide: Symptoms, Costs and the Right Parts

By Core Brake Parts Tech Team — Circleville, OH warehouse

A brake job on a 2005-2012 Acura RL means four-wheel ventilated discs: a 12.6-inch rotor with an aluminum four-piston caliper up front and a 12.2-inch rotor with a single-piston aluminum caliper in back. Most owners replace front pads and rotors first, then do the rears on a later service, and the job is a normal driveway repair as long as you respect the aluminum calipers, the rear rotor collets and the specific brake fluid this car was built with.

How the RL Brake System Is Built

When Acura launched the second-generation RL for 2005, it treated the brakes as a flagship feature. Honda's chassis release says the engineers benchmarked the top sedans from Audi, BMW and Mercedes-Benz and set out to meet or beat them. The result is a stronger setup than a typical front-drive Honda sedan, and it matters when you buy parts.

Every RL of this generation has Acura's Super Handling All-Wheel Drive, ABS, Electronic Brake-force Distribution (EBD), Brake Assist and Vehicle Stability Assist (VSA). EBD shifts pressure between the front and rear axles as load changes, and VSA can brake individual wheels to correct a slide. None of that changes how you swap pads and rotors, but it does mean the hydraulic unit depends on clean fluid and a proper bleed, which is why the fluid choice matters more than usual on this car.

Two details catch people out. First, the RL rear discs are ventilated, not solid, so a thin solid rear rotor from a smaller Acura will not fit. Second, Honda says the rear discs attach to the hub with lightweight aluminum collets. Handle them carefully when the rotor comes off and put them back as they came out.

Signs Your RL Is Due for a Brake Job

• Metallic screech when braking. The owner's manual describes the pad wear indicators plainly: when the pads need replacing you will hear a distinctive, metallic screeching sound when you press the pedal, and if you ignore it the pads will screech all the time.
• Grinding. Once the screech turns into a grind, the friction material is gone and the backing plate is cutting the rotor. At that point rotors are no longer optional.
• Vibration or a pulsing pedal. A shake in the steering wheel under braking usually points to uneven front rotor thickness or pad material transfer. A pulse felt more in the seat often points to the rears.
• Low fluid in the reservoir. The manual says that if the level is at or below MIN, the system needs attention and should be inspected for leaks or worn pads. Fluid drops as pads wear because the caliper pistons move out.
• Warning messages. The RL can show BRAKE FLUID LOW or CHECK BRAKE SYSTEM on the multi-information display. Treat either as a reason to inspect before the next drive.
• Long, soft or sinking pedal. This is hydraulic, not a pad issue. See the master cylinder recall below before you buy parts.

The Maintenance Minder lists "Inspect front and rear brakes" and "Check parking brake adjustment" among its main service items, so an oil change visit is a good time to have pad thickness measured.

Front vs Rear: What Wears and in What Order

Honda lists the 2005 RL weight distribution at 59 percent front and 41 percent rear, and the 2009 car at 58/42. The front axle carries more weight and does most of the braking, so front pads almost always wear out first. On a sedan approaching two tons, the fronts also make the most heat, which is what glazes, warps or cracks rotors.

Rears last longer but are not maintenance-free. VSA brakes individual wheels, and a single-piston sliding caliper can stick on its guide pins if it is not cleaned and lubricated. A rear pad worn far more on one side than the other is the usual sign of a seized slide pin.

A practical plan for most owners:

1. Front pads and rotors together at the first brake service.
2. Rear pads, plus rotors if they are scored, below minimum thickness or pulsing, on the next service or when the rear indicators start to squeal.
3. A full fluid replacement at whichever of those visits falls closest to the three-year fluid interval.

The Right Parts for a 2005-2012 RL

Buy by year and confirm the part fits the RL specifically. A part listed for a TL or TSX is not the same, because the RL front uses a four-piston caliper and a 12.6-inch rotor and the rear uses a ventilated 12.2-inch rotor.

• Pads. Ceramic pads suit how most RL owners drive: low dust on the factory alloy wheels and quiet operation. Browse ceramic brake pads or the full range of brake pads and match your model year.
• Rotors. Replace rotors in axle pairs. If your current rotors are below the minimum thickness stamped on them, deeply scored, or causing a pulse, replace rather than machine. See brake rotors.
• Hardware. New abutment clips and shims help the pads slide freely and stay quiet. A brake hardware kit is cheap insurance on a car that is now well over a decade old.
• Calipers and hoses. If a caliper piston is seized or a rubber hose is cracked or swollen, fix it during the job. Look at brake calipers and brake hoses.

If you are not sure which pad compound or rotor style to choose, start with all brake parts and match the listing to your model year.

Brake Fluid: The Detail That Matters Most on This Car

The RL owner's manual is unusually direct about fluid. It says to always use Honda Heavy Duty Brake Fluid DOT 3. If that is not available, use only DOT 3 or DOT 4 from a sealed container as a temporary replacement, then have the system flushed and refilled with the Honda fluid as soon as possible. It also warns that DOT 5 fluid is not compatible and can cause extensive damage.

There is a documented reason for that warning. NHTSA recall 10V504000 covers 2005-2007 RL models. The factory fluid contains polymers that lubricate certain brake components. If the car is refilled with fluid that lacks those polymers, part of the rubber seal at the rear of the brake master cylinder can dry out and curl as the piston moves, and slowly leak fluid into the brake booster. NHTSA notes this can change pedal feel and, over time, degrade braking performance. The remedy was a free master cylinder seal replacement at the dealer.

The manual also sets the interval: replace the brake fluid every 3 years, independent of mileage and independent of the Maintenance Minder messages. Check the level monthly.

Recalls to Check Before You Start

Run your VIN through NHTSA's recall lookup before a brake job. Two brake-related campaigns apply to this generation:

• 10V504000, brake master cylinder seal (2005-2007 RL). Described above. A leaking seal can put fluid into the booster, which a pad and rotor job will not fix.
• 13V092000, VSA control module (2005 RL). NHTSA says a capacitor in the VSA module may have been damaged in manufacturing, which can cause intermittent automatic brake application, and a loose ground connection may apply partial brake force. The remedy was a wiring harness with a capacitor and a tightened ground connection.

If your 2005 RL has ever grabbed a brake on its own, or a 2005-2007 car has a sinking pedal with no visible external leak, have the recall status checked first.

How Hard Is the Job?

For someone who has done brakes before, front pads and rotors on an RL are an intermediate job. The four-piston front calipers mean you push back several pistons evenly, and the calipers are aluminum, so the bolts must be torqued to the value in the factory service manual rather than by feel. Clean the caliper and bracket contact points, lubricate slide pins and pad ears with brake-specific grease, and never let a caliper hang on its hose.

The rear is similar in effort. Keep the aluminum rotor collets in order, make sure the parking brake is fully released before pulling the rotor, and check the parking brake adjustment afterward, as the Maintenance Minder calls for.

What drives the cost of an RL brake job is mostly scope. Pads only on one axle is the smallest job; pads and rotors on both axles plus a fluid flush is the largest. Seized hardware, a stuck caliper or an open recall add to it. On a car with rotors this large, parts are usually a bigger share of the bill than labor.

After the job, pump the pedal to seat the pistons before moving the car, verify the fluid level, and bed the new pads with a series of moderate stops from medium speed so the pad material transfers evenly to the rotor.

Frequently Asked Questions

Do all 2005-2012 Acura RL models use the same size brake rotors?

Honda's 2005 and 2009 specifications list the same sizes: 12.6-inch ventilated front rotors and 12.2-inch ventilated rear rotors. Still confirm fitment by model year before ordering, since packages and wheel sizes changed in 2009.

Does the Acura RL have rear disc brakes or drums?

It has disc brakes at all four wheels. The rear discs are ventilated and use single-piston aluminum calipers, and the parking brake is set with a foot pedal.

What brake fluid does an Acura RL take?

The owner's manual specifies Honda Heavy Duty Brake Fluid DOT 3. DOT 3 or DOT 4 from a sealed container is acceptable only as a temporary fill, followed by a flush with the Honda fluid. Never use DOT 5.

How often should RL brake fluid be changed?

Every 3 years, regardless of mileage, according to the owner's manual.

Should I replace rotors every time I replace pads on my RL?

Not automatically. Replace rotors if they are below the minimum thickness marked on them, deeply scored, cracked or causing a pulse. On an older RL still on its original rotors, replacement is often better value than machining.

Why does my RL brake pedal sink slowly?

On 2005-2007 cars, check NHTSA recall 10V504000 first. A master cylinder seal leaking into the booster can change pedal feel without any visible fluid under the car.

Sources

1. Honda News: 2005 Acura RL Specifications - rotor diameters, wheels, ABS and VSA, curb weight, weight distribution
2. Honda News: 2005 Acura RL Chassis - four-piston front and one-piston rear aluminum calipers, rear rotor collets, EBD, Brake Assist, benchmark targets
3. Acura News: 2009 Acura RL Specifications - 2009 rotor sizes, 18-inch wheels, curb weight, weight distribution
4. 2006 Acura RL Owner's Manual - brake fluid spec, 3-year fluid interval, wear indicator sound, parking brake pedal, Maintenance Minder brake items
5. NHTSA recalls: 2007 Acura RL - master cylinder seal recall 10V504000
6. NHTSA recalls: 2005 Acura RL - VSA control module recall 13V092000