Sealed hydraulic clutch master cylinder for TOYOTA LAND CRUISER XUI3804A

CM246

Parameter Items	Specifications
Product Model	XUI3804A
OE Number	31410-60023 / 31410-60024 / 31410-60032 / 31410-60041
Bore (DIA)	19.05 mm (3/4 inch)
Mounting Size	Φ30 / △52 (three-hole distribution) / 3-Φ8.9
Connecting Size	M10 × 1.0
Applicable Transmission Type	Manual Transmission
Applicable Vehicle Platform	Land Cruiser J40 Series / J50 Series / J60 Series
Applicable Vehicle Years	1968 – 2001
Main Target Markets	Middle East, Africa, Australia, Southeast Asia, Latin America

The clutch master cylinder is the core hydraulic component of the clutch system in a manual transmission vehicle. Its working principle is straightforward: pressing the clutch pedal → the master cylinder converts the pedal force into hydraulic pressure → this pressure pushes the driven cylinder through the oil lines → the clutch disc disengages → gear shifting is completed.

When the master cylinder ages or its seals fail, the most common symptoms are: a soft, unrestricted clutch pedal, difficulty shifting gears, and fluid leakage near the pedal. For vehicles frequently driven through water, climbing hills, or off-road, these types of malfunctions directly impact traction and driving safety.

Applicable Models (Application) This product is compatible with the Toyota Land Cruiser Classic Series, specifically covering the following:
• 1968–2001 TOYOTA LAND CRUISER (J4, J5) — Covering classic off-road models such as FJ40/BJ40/HJ45 and large station wagon models such as FJ55/FJ60
• 1980 – TOYOTA LAND CRUISER (J6) — J60 series, Toyota Land Cruiser Classic Station Wagon Platform
• TOYOTA LAND CRUISER Pickup (J4) — J40 series derivative pickup truck version

Market Background: The J40 series (including FJ40, BJ40, HJ45, etc.) is the longest-produced and most representative off-road vehicle in Toyota Land Cruiser history, with production spanning 33 years from 1968 to 2001. This vehicle series boasts a high ownership rate in the Middle East, Africa, Australia, Southeast Asia, and Latin America, and continues to be widely used in off-road adventures, agriculture, mining, and collectible modifications. Due to the average age of these vehicles being between 25 and 55 years, and some models having been discontinued for many years, the supply of original parts is increasingly tight, and the demand for high-quality replacement parts remains constant.

Core Functions
• Hydraulic Pressure Conversion: Linearly converts pedal force into hydraulic output, ensuring precise disengagement and adapting to the long-travel pedal requirements of off-road vehicles.
• Sealed Hydraulic Circuit: Built-in high-precision sealing components prevent brake fluid leakage, maintain long-term stable pipeline pressure, and adapt to frequent vibrations under complex off-road conditions.
• Original Cylinder Bore Matching: The 19.05mm (3/4 inch) cylinder bore matches the original vehicle calibration, and the hydraulic output force meets the Land Cruiser's heavy-duty off-road performance requirements.
• Three-Hole Flange Mounting Design: The mounting flange uses a three-hole fixing structure (Φ30/△52/3-Φ8.9), precisely corresponding to the original vehicle mounting position, ensuring stability and durability, suitable for long-term high-intensity use.
• M10×1.0 Standard Interface: The hydraulic line interface uses a common thread specification found in classic Toyota models, allowing direct connection to the original vehicle's piping without the need for adapters or modifications. 
• Multi-Generation Universal Design: A single product corresponds to 4 original equipment manufacturer (OEM) part numbers, covering multiple model years across more than 30 years of production, simplifying inventory preparation and parts retrieval processes.

Q1: What is the difference between XUI3804A and genuine Toyota parts? A: XUI3804A is an OEM equivalent manufactured to original equipment manufacturer (OE) specifications. The cylinder bore, three-hole flange mounting dimensions, and hydraulic interface threads are all identical to the original parts, conforming to ISO 9001 quality standards. Many Land Cruiser J40 series OE parts are discontinued or have long lead times; this product serves as a stable and reliable alternative.

Q2: Do the four OE part numbers correspond to the same product?
A: The four part numbers 31410-60023, -60024, -60032, and -60041 all point to the same mounting structure and hydraulic specifications in different years and regional versions of the Land Cruiser. XUI3804A can cover all of them. It is recommended to check the vehicle's production year or VIN code before ordering. If you have any questions, please contact us for assistance.

Q3: The J40, J50, and J60 series are very different; are the master cylinders truly interchangeable?
A: Although the J40 (off-road hardcore version), J50 (large wagon version), and J60 (wagon replacement version) differ in body style, these generations of models shared the same clutch hydraulic system mounting structure (three-hole flange + M10×1.0 interface) during this period, so the same master cylinder can be used. However, it is still recommended to check the vehicle year and chassis code for specific details.