Two Bolts clutch master cylinder for TOYOTA TT, TC XUI3554A-1

CM246

Parameter Item	Specification Value	Remarks
Product Model	XUI3554A-1	One Bolt Version
OE Number	31410-14800	Toyota Original Standard Number, More Common Replacement Part
Inner Diameter (DIA)	15.87mm (5/8 inch)	Early Toyota Pickup Truck Standard Size
Installation Dimensions	Φ26.7 / 72 / 45° / Φ9, M8×1.25 single bolt fixing	Hole diameter Φ26.7mm, installation angle 45°
Connecting thread	M10 × 1.0	Standard hydraulic pipeline connection specification
Main body material	Cast iron	Surface rust-proof treatment, high pressure resistant
Piston material	Aluminum alloy + rubber seals	Main seal + auxiliary seal double sealing
Applicable models	Toyota TT/TC (14#) Pick-Up 1982 and later	—
Compatible engines	20R / 22R gasoline series 2.2L–2.4L inline four-cylinder	—
Quality certification	ISO9001 / TS16949	Compliant with automotive industry quality management system

This master cylinder with a one-bolt mounting structure was designed specifically for Toyota TT and TC (14#) pickup trucks manufactured in 1982 and later. It features a cast iron body and an inner diameter of 5/8 inches (15.87mm), a standard specification for early Toyota pickup models. Compared to the dual-bolt version, the single-bolt structure is easier to install, fully meeting the requirements for standard road conditions while reducing installation complexity and maintenance time.

Specific Applications
Compatible Models
Toyota TT Pick Up — 1982 and later models, early Toyota pickup truck series, light commercial pickup trucks for the Japanese domestic and export markets.
Toyota TC Pick Up — 1982 and later models, sharing chassis and powertrain architecture with the TT series, known in some markets as Toyota Pickup or Toyota Truck.
Toyota TC (14#) — Specific chassis number version, 14# represents a specific production batch or configuration code, sharing the clutch hydraulic system with the standard TC series.
Toyota Pickup (1982-1983) — Certain years of the third-generation Toyota pickup truck in the North American and Australian markets, equipped with 20R/22R gasoline engines.
Toyota 4Runner (early versions) — Some early SUV models sharing a chassis with the pickup truck.

Core Function
The clutch master cylinder is the starting control unit of the hydraulic clutch system in manual transmission vehicles, XUI3554A-1 The core functions include:
Hydraulic Pressure Generation: Converts the mechanical force of the driver's pedal input into hydraulic pressure, which is then transmitted to the clutch slave cylinder via pipelines.
Precise Stroke Control: A standard 15.87mm inner diameter design ensures a linear correspondence between pedal travel and clutch disengagement travel.
Sealing and Pressure Holding: A built-in double-sealing structure with main and auxiliary piston cups prevents hydraulic oil leakage and maintains system pressure stability.
Convenient Single-Bolt Installation: M8×1.25 single-bolt installation method, simplifying installation and reducing maintenance and replacement time.
Buffer Seat Design: Note whether the connector is equipped with a buffer seat, as this design directly affects installation compatibility and pipeline connection sealing.

What problems can this product solve for overseas customers? Original parts discontinued or with lead times of 3-6 months: In-stock/near-in-stock supply, lead time 45-50 days, safety stock plan supported.
Aftermarket parts quality varies, frequent sealing leaks: ISO9001/TS16949 quality system control, 100% sealing test before shipment.
Single-bolt version complex installation, high maintenance time: Single-bolt M8×1.25 structure, easy installation, reducing maintenance time and labor costs.
Different batch buffer seat designs, high return rate due to incorrect purchases: Detailed part number comparison table and buffer seat confirmation guide provided, sample customization supported.
Supplier uncooperative with small-batch trial orders: Logo/packaging customization supported for orders of 100 pieces or more, lowering the entry barrier for new customers.
Target market (North America/Australia) price sensitive: Tiered pricing system, bulk purchases can lock in annual prices to resist exchange rate fluctuations.

Q1: XUI3554A-1 and What is the difference between XUI3554A (double bolt) and XUI3554A-2 (boltless)?
A: All three have an inner diameter of 15.87mm and M10×1.0 connecting threads, but their installation and fixing methods differ. XUI3554A-1 uses a single bolt M8×1.25 for fixing and is suitable for Toyota TT/TC (14#) pickup trucks; XUI3554A uses double bolts for fixing and is suitable for Toyota Hilux LN36/LN40 pickup trucks; XUI3554A-2 is a boltless design and is suitable for Toyota Carina II T17 series. Please confirm the version based on the actual vehicle's mounting hole positions and the structure of the old part.

Q2: How can I determine whether my vehicle needs the version with or without a buffer seat?
A: The buffer seat is located at the hydraulic line connection end and is used to absorb line vibration and enhance sealing. Please remove the old part and take photos to confirm whether the connector has a rubber/plastic buffer pad structure, or provide the vehicle's VIN code and the old part's OE number so we can assist with verification.

Q3: Is this master cylinder compatible with right-hand drive (RHD) and left-hand drive (LHD) vehicles?
A: The clutch master cylinder is a universal component for hydraulic systems and is not differentiated by left or right drive. It can be installed as long as the vehicle model and OE number match. Both RHD and LHD versions of Toyota TT/TC are compatible.