Sealed pressure-holding clutch slave cylinder XUI4525A for TOYOTA

CM246

Parameter Item	Specification Value	Remarks
Product Model	XUI4525A	Toyota Pickup/Commercial Vehicle Platform Dedicated
Inner Diameter (DIA)	20.64 mm (13/16 inches)	Standard Toyota pickup specification
Installation Dimensions	Φ29.5 / 34 / 2-Φ9	Dual-hole mounting; hole diameter Φ29.5 mm, mounting hole spacing 34 mm
Connection Thread	M10 × 1.0 (double-end)	Dual-pipe interface, standard hydraulic pipeline connection specification
Main Body Material	Gray Cast Iron	High temperature resistant, deformation resistant, suitable for heavy-duty conditions
Piston Material	Steel with rubber seals	Main piston cup seal made of oil-resistant rubber
Applicable Models	Toyota 4Runner / Pickup / T100 / Liteace / Hiace / Dyna / Van / Corona	Fits 1978–1998 models
Compatible Engines	1Y / 2Y / 3Y / 4Y / 18R / 22R-E / 3VZ-E	1.6L–3.0L inline four-cylinder / V6 gasoline engines
Drive Type	Mainly Left-Hand Drive (LHD)	Partial models support Right-Hand Drive (RHD)
Quality Certifications	ISO9001 / TS16949	Compliant with automotive industry quality management systems

This brake caliper was designed specifically for Toyota 4Runner, Pickup, Liteace, Hiace, and Dyna models manufactured between 1978 and 1996. It features a gray cast iron body and an inner diameter of 13/16 inches (20.64mm), making it the standard component for Toyota's Y-series and S-series engines. Compared to aluminum alloy, cast iron brake calipers are more durable under heavy loads and high temperatures, making them more suitable for the environments of pickup trucks and commercial vehicles.

Specific Applications:
Toyota 4Runner (N1) — 1984-1996 models, first-generation compact SUV, equipped with 22R-E 2.4L/3VZ-E 3.0L gasoline engines, chassis codes RN5#/LN5#/VZN6#/RN7#/RN6#/RN10#/VZN13#/VZN10#/RN13#, a mainstay off-road vehicle in the North American and Australian markets.
Toyota Pickup — 1979-1995 models, third to fifth generation Toyota pickup trucks, equipped with 1Y/2Y/18R/3Y/4Y/22R series engines, chassis codes LN3#/RN2#/LN4#/RN3#/RN6#/RN5#/LN6#/YN6#/YN5#/LN5#, a commercial pickup truck with a large presence in the North American, Middle Eastern, and Australian markets.
Toyota T100 — 1994 model, Toyota's first full-size pickup truck for the North American market, equipped with a 3VZ-E 3.0L V6 engine, sharing some clutch hydraulic systems with the Pickup.
Toyota Van — 1989 model, an early Toyota van for the North American market, sharing some chassis components with the Pickup.
Toyota Corona — 1978 model, a classic Toyota sedan, some manual transmission versions used this slave cylinder.
Toyota Liteace Box (M3) — 1983-1998 model, a light commercial van for the Japanese and Southeast Asian markets, equipped with 2Y/3Y/4Y series engines, chassis code CM3#/KM3#, a mainstay model for urban logistics and delivery.
Toyota Liteace Bus (M3) — 1985-1992 model, the passenger version of the Liteace, sharing the clutch hydraulic system with the Box version.
Toyota Liteace Box (KM2_) — 1979-1986 model, an early Liteace... Van version, equipped with 2Y-C/3Y-C/4Y-EC engine
Toyota Dyna 150 Platform/Chassis — 1985-1988 model year, Toyota light truck chassis, targeting the commercial transportation market, equipped with 2Y/3Y engine
Toyota Hiace II Box — 1987-1989 model year, second-generation Hiace van version, equipped with 3Y 2.0L engine, chassis code LH5#/YH7#/LH7#/LH6#/YH6#/YH5#

Core Function: The clutch slave cylinder is the end-effector of the hydraulic clutch system in manual transmission vehicles, XUI4525A Core functions include:
Hydraulic pressure actuation: Receives hydraulic oil pressure from the clutch master cylinder, pushing the piston to generate mechanical thrust.
Disengagement fork drive: Piston thrust is transmitted to the release fork, pushing the release bearing to press against the clutch pressure plate, achieving clutch disengagement.
Precise stroke control: 20.64mm (13/16 inch) standard inner diameter design ensures hydraulic matching with the master cylinder and consistent shifting feel.
Sealed pressure maintenance: Built-in master cup sealing structure, made of oil-resistant rubber, prevents hydraulic oil leakage and maintains system pressure stability.
High-temperature resistant cast iron: The gray cast iron body is more heat-resistant than aluminum alloy and is less prone to deformation under the off-road conditions of pickup trucks and heavy-duty conditions of commercial vehicles.
Dual piping interface: M10×1.0 dual connection thread design, adaptable to the piping layout requirements of different vehicle models.

OE Number Applicable Instructions
31470-20130 Toyota original standard number, universal replacement part for 4Runner/Pickup/Liteace
31470-20131 Same series variant number, consistent mounting dimensions
31470-22150 Toyota original part number, Pickup/Dyna specific version
31470-30260 Toyota original part number, 13/16 inch inside diameter standard specification
31470-35040 Toyota original part number, 4Runner/Pickup later version
31470-35041 Same series variant number, interchangeable with 31470-35040
31470-35050 Toyota original part number, common replacement part for 4Runner/Pickup
31470-35070 Toyota original part number, 4Runner specific version
31470-35071 Same series variant number, interchangeable with 31470-35070
31470-35100 Toyota original part number, Pickup/T100 specific version
DORMAN: CS37525 is a Dorman brand cross-number for the North American market, suitable for Toyota 4Runner 1984-1995/Pickup 1979-1995/T100 1994/Van 1989/Corona 1978.
Important Note: Different OE numbers may have slight differences in piston stroke and mounting bracket design, directly affecting installation compatibility. It is recommended to check the actual vehicle used part or provide the VIN code for confirmation before ordering.

What problems can this product solve for overseas customers?
Original parts out of production 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 leaks and seals: ISO9001/TS16949 quality system control, 100% sealing test before shipment.
Aluminum alloy pump deforms and cracks under off-road conditions: Gray cast iron body, high temperature resistance, impact resistance, suitable for pickup truck off-road and heavy-duty commercial vehicles.
Different OE numbers correspond to different mounting brackets, high return rate for incorrect purchases: Provides detailed numbering tables and mounting bracket confirmation guidelines, supports sample customization.
Small batch trial orders, supplier non-cooperation, support for orders of 100 pieces or more: Logo/packaging customization, lowering the entry barrier for new customers.
Target markets (North America/Middle East) are price-sensitive: Tiered pricing system, bulk purchases can lock in annual prices to resist exchange rate fluctuations.
Classic model restoration projects are difficult to find suitable parts: Complete coverage of Toyota models from 1978-1998. Pickup/Commercial Vehicle Platform, Supporting One-Stop Procurement for Repair Projects

Q1: What is the difference between XUI4525A and the clutch master cylinder?
A: The clutch master cylinder is installed in the driver's compartment and connected to the pedal; the slave cylinder (XUI4525A) is installed near the transmission and connected to the release fork. They are connected via hydraulic lines. The master cylinder generates pressure, and the slave cylinder performs the release action. When replacing, it is necessary to confirm whether the fault lies with the master cylinder or the slave cylinder. Typically, a slave cylinder failure manifests as difficulty shifting, a soft pedal, or oil leakage.

Q2: How can I determine which OE number slave cylinder my vehicle needs?
A: Different OE numbers may differ in piston stroke and mounting bracket angle. Please remove the old part and take photos to confirm the shape and angle of the mounting bracket, or provide the vehicle's VIN code and the old part's OE number, and we will assist in verification.

Q3: Is this slave cylinder compatible with right-hand drive (RHD) and left-hand drive (LHD) vehicles?
A: XUI4525A is primarily compatible with left-hand drive (LHD) vehicles. Some right-hand drive versions of the Toyota Pickup/Hiace can also be used, but it is recommended to provide the VIN code for verification.

Q4: What causes wheel cylinder oil leakage? How to determine if replacement is needed?
A: Wheel cylinder oil leakage is usually due to aging of internal rubber seals or piston wear. Diagnosis methods: Check for oil stains at the bottom of the wheel cylinder, whether the clutch pedal feels soft and weak when depressed, and whether shifting gears is difficult. If any of these symptoms are present, it is recommended to replace it as soon as possible to avoid hydraulic fluid leakage leading to complete clutch failure.