2013 Lexus LX570 Brake Master Cylinder and Booster Assembly Failures
A guide to diagnosing symptoms, understanding replacement costs, and buying a used brake actuator assembly for the 2013 Lexus LX570.
- The part is a complete Brake Booster and Master Cylinder Assembly, not just a simple cylinder. It must be replaced as a single unit (OEM Part # 47050-60510).
- Replacement requires a specialized brake bleeding procedure using diagnostic software like Toyota Techstream to cycle the ABS pump; it is not a simple DIY job.
- Common failure symptoms include a spongy/sinking pedal, multiple dashboard warning lights (BRAKE, ABS, VSC), and the sound of the electric pump running too often.
- There are no common aftermarket or remanufactured options, making a new OEM or a quality-inspected used OEM assembly the only realistic choices.
Understanding the 2013 LX570 Brake System
When troubleshooting brake problems on a 2013 Lexus LX570, it's critical to understand that you are dealing with more than just a simple master cylinder. The part is an integrated electro-hydraulic assembly that includes the master cylinder, an electric brake booster pump, and a pressure accumulator. Failures almost always involve this entire unit, which is why it is typically replaced as a complete assembly. The OEM part number for the complete unit is 47050-60510. While a separate "master cylinder sub-assembly" (part number 47025-60510) exists, it is rarely the sole point of failure or the correct service part for common issues.
Symptoms of a Failing Brake Master Cylinder Assembly
Failure of this assembly can present a combination of physical sensations, sounds, and dashboard warnings. Because it's a critical safety component, these symptoms should be addressed immediately.
- Spongy or Sinking Brake Pedal: This is the most common symptom. The pedal may feel soft, travel further to the floor than usual, or slowly sink while you hold it down at a stop. This often indicates an internal leak within the master cylinder seals.
- Multiple Dashboard Warning Lights: A failure will typically trigger a Christmas tree effect on the dashboard. Expect to see the BRAKE, ABS, VSC, and TRAC lights illuminate.
- Excessive Pump Noise: You may hear a buzzing or electric motor sound from the engine bay more frequently. A healthy system's pump might run for a few seconds when the car is started, but a failing one may run every time you press the brake, or run continuously.
- Diagnostic Trouble Codes (DTCs): A common trouble code stored in the computer is C1256, which points to a fault with the accumulator's low pressure. Other ABS-related codes may also be present.
- Inconsistent Braking Feel: Some drivers report a long pedal throw before the brakes engage, or a sudden increase in braking force as the pump kicks on during a stop.
Warning: Any significant change in brake pedal feel or the appearance of the "BRAKE" warning light indicates a serious safety issue. The vehicle should not be driven and should be inspected by a professional immediately.
Buying a Used 2013 LX570 Brake Master Cylinder: What to Check
Due to the high cost of a new OEM assembly, a quality used unit from a reputable recycler is a viable option. However, careful inspection is key. For this specific part, a low-mileage, tested OEM unit is far superior to a new, unproven aftermarket alternative (which are rare for this assembly anyway).
Inspection Checklist:
- Buy the Complete Assembly: Ensure you are purchasing the entire unit (part number 47050-60510), including the master cylinder, reservoir, pump, and accumulator. Do not buy just the cylinder portion.
- Check for Leaks: Thoroughly inspect the entire unit for any signs of brake fluid leaks. Pay close attention to the seals between the reservoir, cylinder, and pump motor. Oily dirt or wet spots are major red flags.
- Inspect Electrical Connectors: Check the electrical plugs and wiring for corrosion, damage, or brake fluid contamination. Leaking fluid can damage the connectors and cause electrical faults.
- Examine the Fluid Reservoir: The reservoir should be free of cracks. The fluid inside (if any) should not be black or contain debris, as this can indicate internal seal failure.
- Verify Donor Vehicle Information: Whenever possible, purchase from a seller who can provide the VIN and mileage of the donor vehicle. A part from a lower-mileage, non-accident vehicle is always preferable.
Replacement Difficulty and Procedure Overview
Difficulty Rating: 4.5 out of 5
Replacing the brake master cylinder assembly on the LX570 is a complex task recommended for experienced mechanics or very skilled DIYers with the right tools. The physical replacement involves disconnecting brake lines and electrical connectors and unbolting the heavy assembly from the firewall. The most critical and difficult part of the job is the brake bleeding procedure.
Pro Tip: The electro-hydraulic brake system on the LX570 cannot be bled properly using traditional methods. It requires a diagnostic scan tool, such as Toyota's Techstream software, to cycle the ABS pump and accumulator. Attempting to bleed the brakes manually will leave air trapped in the system, resulting in a spongy pedal and unsafe braking performance.
| Cost Breakdown | |
|---|---|
| New OEM Assembly | $1,450 - $1,850 |
| New Aftermarket Assembly | Not commonly available |
| Used OEM Assembly | $700 - $1,400 |
| Remanufactured Assembly | Not commonly available |
| Shop Labor Cost | $400 - $700+ |
| Total (New OEM) | $1,850 - $2,550 |
| Total (Used OEM) | $1,100 - $2,100 |
Note: Prices are estimates and can vary based on location, supplier, and vehicle condition. Labor costs are higher than a standard master cylinder replacement due to the complex bleeding procedure.
Frequently Asked Questions (FAQ)
Can I just replace the master cylinder instead of the whole assembly?
While technically possible, it is not recommended. The most common failure modes involve the integrated pump and accumulator, not just the cylinder. Replacing only the cylinder is unlikely to solve the problem and the system will have to be opened up again. The standard and correct repair is to replace the entire assembly.
Do I really need Techstream software to bleed the brakes?
Yes. The software is required to perform a zero point calibration and to activate the ABS pump and solenoids in a specific sequence to purge all air from the new components. Without it, you cannot properly bleed the system, and the brakes will not function correctly or safely.
Is a part from a Toyota Land Cruiser compatible?
Yes, the 2013 Lexus LX570 shares its platform and many parts with the Toyota Land Cruiser (J200 series). The brake master cylinder assembly (part number 47050-60510) is listed as fitting both the 2013-2016 LX570 and the 2013-2016 Land Cruiser, making them interchangeable.
Are there any recalls for this part on my 2013 LX570?
As of mid-2024, there are no specific recalls issued by the NHTSA for the brake master cylinder or booster assembly on the 2013 Lexus LX570. There was a TSB for brake squeaking, but this related to the brake discs, not the master cylinder assembly.
Technical Specifications
OEM Part Numbers: 47050-60510 47025-60510 47025-60520 4705060520
The primary service part is the complete assembly, OEM part number 47050-60510. This is an electro-hydraulic unit containing a master cylinder, electric booster pump, and pressure accumulator. It is shared with the 2013-2016 Toyota Land Cruiser.
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 LX570: