Hydraulic Clutch Master Cylinder for Toyota Land Cruiser XUI3551L-1

CM246

Product Specifications: The following parameters are all measured data and are key bases for procurement verification and installation matching. This product features a unique hybrid mounting design, the only one of its kind in this series. Please verify the following:

Specifications Item	Value / Description
Part No.	XUI3551L-1
Internal Model	CM246
OE Reference Number	31410-60350 / 31410-60550
Piston Diameter	15.87 mm
Mounting Size	Φ26.7 / 72 / 45° / Φ9 + M8×1.25 (bolt)
Mounting Hole Description	Hybrid design: one Φ9 through hole + one M8×1.25 threaded hole, two different hole types combined for fixing
Hydraulic Connection	M10 × 1.0
Mounting Angle	45°
Hole Spacing (Mounting Center Distance)	72 mm
Transmission Compatible	Manual Transmission
Product Certification	ISO 9001 / TS16949

This is an aftermarket replacement part, strictly conforming to Toyota's original equipment (OE) specifications. It is specifically designed for the Toyota Land Cruiser 80 series (J8, 1990-1999), covering OE numbers 31410-60350 and 31410-60550.

If the master cylinder fails, the vehicle will experience problems such as pedals feeling weak and unresponsive, difficulty shifting gears, or inability to shift gears. For heavy-duty off-road vehicles like the Land Cruiser 80, the clutch pump operates under high loads and complex road conditions for extended periods, placing much higher demands on the quality of parts compared to ordinary passenger cars.

Vehicle Application:
XUI3551L-1 is precisely compatible with the following models, covering the Toyota Land Cruiser 80 series in use in major markets worldwide:

Toyota Land Cruiser 80 (_J8_ chassis series, 1990 – 1999)
Chassis code _J8_ represents the eighth generation of the Land Cruiser (80 series), produced from 1990 to 1999, a total manufacturing cycle of 9 years.
One of the world's most recognized heavy-duty off-road SUVs, with a curb weight of approximately 2,300 kg, designed for extreme off-road and heavy-duty conditions.
Factory-installed with various powertrains: including a 4.5L inline-six gasoline engine (1FZ-FE), a 4.2L diesel engine (1HZ), and a 4.2L turbo diesel engine (1HD-T / 1HD-FT), etc. Manual transmission versions all use a hydraulic clutch system.
OE Reference Number 31410-60350 This product corresponds to an earlier version; 31410-60550 corresponds to a later modified version. Both part numbers are compatible.

Core Function: The Land Cruiser 80 is used extensively in extreme off-road conditions, under heavy loads, and in complex terrain, placing extremely high demands on the reliability of its clutch system. The core functions of the XUI3551L-1 are as follows:
Hydraulic Drive: Converts pedal force into precise hydraulic pressure, driving the entire hydraulic clutch circuit to complete the action.
Sealed Pressure Maintenance: Built-in precision sealing components ensure the system is leak-free and the hydraulic pressure remains stable over a long period, preventing the pedal from becoming soft due to pressure loss.
Precise Control: The piston diameter of 15.87mm perfectly matches the original hydraulic ratio, ensuring that the pedal travel and feel are consistent with the original vehicle.
Quick Reset: The spring return mechanism ensures that the pedal rebounds immediately after release, which is especially important in off-road driving scenarios where frequent clutch use is required.
Heavy-Duty Durability: The sealing material is optimized for the high-frequency, heavy-load conditions of heavy-duty SUVs, extending service life and reducing replacement frequency.

What problems can this product solve for overseas customers?
The buyer group for the Land Cruiser 80 differs from that of ordinary pickup truck users. They are typically off-road vehicle owners or professional off-road vehicle parts dealers with high-quality requirements, making them more discerning about parts quality. However, their market pain points are also more concentrated:
High price and long lead time for original parts: Toyota LC80 OE parts (31410-60350/60550) are expensive, and in some markets, they require long delivery times, leading to high costs for repair shops.
High error rate in selection due to mixed hole structure: The mixed installation design of this product with Φ9 through holes and M8 threaded holes is relatively rare in the market. Buyers are easily confused with the double through hole model, resulting in a high rate of purchasing the wrong parts and losses from returns and exchanges.
Extremely poor reputation of counterfeit and inferior parts in the LC80 owner community: The LC80 community has strict requirements for parts quality. Once oil leaks or malfunctions occur, not only will owners complain, but negative reviews will also spread rapidly in the off-road community, affecting the brand's reputation.
LC80 Off-road conditions put significant strain on seal lifespan: Extreme road conditions, high temperatures, and high altitudes accelerate seal aging. Low-quality replacement parts have short lifespans, requiring frequent replacements.
Lack of reliable Chinese suppliers specializing in LC80 parts: LC80 buyers generally struggle to find stable suppliers that offer both certification and familiarity with the specific hole configurations of this part.

Q: Why is the mounting hole design for this product a hybrid design (Φ9 + M8)?
A: The original design for the Toyota Land Cruiser 80 uses a combination of a Φ9 through hole and an M8×1.25 threaded hole. This product completely replicates the original vehicle's mounting structure. This differs from other models in the same series (dual through hole/dual threaded hole); it is a hole configuration specific to the LC80 model. Please verify before installation.

Q: Is this product suitable for the Land Cruiser 70 or 100 series?
A: No. This product is only verified to be compatible with the Land Cruiser 80 series (J8, 1990-1999 models). The clutch pump specifications for the 70 series and 100 series are different; please do not use them interchangeably. For other series products, please provide the OE part number to contact us to confirm availability.