2018-2025 Lexus LS500 Brake Booster: Recall, Diagnosis, and Replacement Guide
This guide covers the critical details of the 2018-2025 Lexus LS500 power brake booster, including a major recall, symptoms of failure, and the important distinction between F-Sport and non-F-Sport models.
- A critical safety recall (NHTSA 19V544000) affects the brake booster pump on some 2019 LS500 models; verify this is complete before buying.
- This booster (part 44610-50410) is ONLY for non-F-Sport models. F-Sport versions have different brakes and are not compatible.
- The primary symptom of failure is a very hard brake pedal and loss of stopping power, which is a critical safety hazard.
- Failure will trigger multiple dashboard warning lights, including ABS, VSC, and the main brake warning.
Known Issues, TSBs, and Recalls
Recall: 2019 Brake Booster Pump Failure (NHTSA ID: 19V544000)
Warning: A critical safety recall was issued for certain 2019 Lexus LS500 models. The brake booster pump could fail, leading to a sudden loss of power braking assist and the deactivation of the Vehicle Stability Control (VSC) system. This dramatically increases stopping distances and the risk of a crash. Dealers will inspect and replace the faulty pump free of charge. Before purchasing a used 2019 LS500, it is essential to verify with a Lexus dealer that this recall (Lexus recall numbers K2F/KLF) has been completed.
TSB: Squawk/Knock Noise When Depressing Brake Pedal (L-SB-0026-20)
Some 2018-2020 LS500 and LS500h vehicles may develop a squawk or knock noise from the engine compartment when the brake pedal is pressed or released. This TSB addresses the issue, which may be related to the booster or pedal assembly.
TSB: Rear Knock/Clunk Noise on Braking (L-SB-0013-22 Rev)
While not directly a booster issue, some 2018-2023 LS500 models may exhibit a clunking noise from the rear of the vehicle when braking. This is a separate issue covered by a technical service bulletin.
Symptoms of a Failing Power Brake Booster
A failing brake booster on an LS500 is a serious safety issue that requires immediate attention. Because it is an electronic system, symptoms can include both physical sensations and electronic warnings.
- Hard Brake Pedal: This is the most common and dangerous symptom. The pedal will feel extremely firm and difficult to press, requiring significantly more leg strength to stop the car. This indicates a loss of power assist.
- Increased Stopping Distance: Because you can't apply as much force to the brakes, the car will take much longer to stop.
- Hissing Noise: A hissing or whooshing sound from the brake pedal area when it's pressed or released often points to a vacuum leak in older systems, but on an electronic booster, it can indicate an internal seal failure. However, a very faint hiss can be normal on some Lexus vehicles. A loud, new, or changing hiss is a cause for concern.
- Illuminated Warning Lights: A failure in the electronic brake booster system will almost certainly trigger multiple warning lights on the dashboard. Expect to see the ABS, Traction Control (VSC), and a general brake warning light. A Check Engine Light may also appear if a related sensor fails.
Compatibility: The F-Sport Difference
Warning: The power brake booster with part number 44610-50410 is specifically for 2018-2025 Lexus LS500 models WITHOUT the F-Sport package. The F-Sport models have a different, higher-performance braking system, including larger six-piston front calipers and bigger rotors, and likely use a different booster and master cylinder assembly. These parts are not interchangeable. Always verify the part number and vehicle options before purchasing.
Buying a Used Power Brake Booster
Given the complexity and safety-critical nature of this part, buying a used unit requires careful consideration. However, a low-mileage OEM recycled part can be a good value compared to a new dealer part.
- Verify the Part Number: The most important step. You must match the OEM part number exactly. For non-F-Sport models, this is 44610-50410. Do not attempt to use a part from an F-Sport model or any other vehicle.
- Check for Recalls: If buying for a 2019 model, insist on proof that the booster pump recall (19V544000) was performed. A seller should be able to provide service history from a Lexus dealer.
- Physical Inspection: Look for any signs of physical damage, corrosion, or fluid leaks. The electrical connectors should be clean and free of bent or broken pins. Ensure all mounting points are intact.
- Mileage and Vehicle History: Failures on these models are not common outside of the recalled units. A part from a low-mileage, accident-free vehicle is ideal. Given the vehicle's age range, mileage is less of a concern than the part's history and proper function.
- Why Used OEM is a Good Choice: Unlike cheap aftermarket alternatives which may not exist for such a specific, modern part, a used OEM booster is the exact same component that was installed at the factory. It guarantees proper fit, function, and communication with the vehicle's complex electronic systems.
Cost Comparison
Replacing the LS500's power brake booster is an expensive repair, primarily due to the cost of the part itself. Labor involves working in a tight space and requires bleeding the entire brake system afterward.
| Part / Service | Estimated Cost |
|---|---|
| New OEM (Dealer) | $580 - $850 |
| New Aftermarket | Not Generally Available |
| Used OEM (Recycled) | $250 - $500 |
| Shop Labor | $350 - $550 |
| Total New OEM Replacement | $930 - $1400+ |
| Total Used OEM Replacement | $600 - $1050+ |
Note: Prices are estimates and can vary based on location, supplier, and vehicle condition.
Frequently Asked Questions (FAQ)
Can I drive my LS500 with a bad brake booster?
No. It is extremely dangerous. A failed brake booster leads to a very hard brake pedal and significantly increased stopping distances, creating a high risk of a crash. The vehicle should be towed to a repair facility immediately.
Is a hissing sound from the brake pedal always a bad booster?
Not always. Some Lexus vehicles exhibit a faint, normal hissing sound during brake operation. However, if the sound is loud, new, or accompanied by a hard brake pedal or warning lights, it indicates a serious problem that could be the booster, a vacuum line, or an internal seal.
Do I need to bleed the brakes after replacing the booster?
Yes, absolutely. Replacing the power brake booster requires disconnecting the master cylinder, which introduces air into the hydraulic brake lines. The entire brake system must be professionally bled according to manufacturer procedures to ensure there is no air in the lines, which would cause a spongy or ineffective pedal.
What is the difference between the brake booster and the master cylinder?
The brake booster and master cylinder work together but have different jobs. The master cylinder is what actually converts the force from the pedal into hydraulic pressure. The power brake booster is the component that provides power assist, making the pedal easy to push. On the LS500, the booster is an electronic pump assembly that sits between the pedal and the master cylinder.
Helpful Videos
Technical Specifications
OEM Part Numbers: 44610-50410
Electronically controlled brake booster pump assembly. Fits non-F-Sport models only.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus LS500:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Known Issues, TSBs, and Recalls
- Recall: 2019 Brake Booster Pump Failure (NHTSA ID: 19V544000)
- TSB: Squawk/Knock Noise When Depressing Brake Pedal (L-SB-0026-20)
- TSB: Rear Knock/Clunk Noise on Braking (L-SB-0013-22 Rev)
- Symptoms of a Failing Power Brake Booster
- Compatibility: The F-Sport Difference
- Buying a Used Power Brake Booster
- Cost Comparison
- Frequently Asked Questions (FAQ)
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