Sealed Leak-Proof Clutch Hydraulic Master Pump for CHEVROLET, OPEL ASTRA, VAUXHALL XUI3042S

CM246

It's the first hydraulic component triggered when you press the clutch pedal in a manual transmission car. If it leaks, the pedal will become very soft, you won't be able to press it all the way down, or you'll feel the clutch not disengaging completely when shifting gears; in severe cases, you might press the pedal into the void, and the car won't move. Its principle is very similar to the brake master cylinder, except one controls the brakes and the other controls the clutch.

Specific Applications: From 2009: Chevrolet Cruze Sedan (CHEVROLET CRUZE J300)
From 2010: Chevrolet Cruze Hatchback (CHEVROLET CRUZE Hatchback J305)
From 2010: Chevrolet Orlando MPV (CHEVROLET Orlando J309)
2009-2015: Opel Astra J (OPEL Astra J P10)
From 2011: Opel Astra J GTC Coupe (OPEL Astra J GTC)
From 2012: Opel Astra J Sedan (OPEL Astra J Saloon)
2010-2015: Opel Astra J Sports Tourer (OPEL Astra J P10)
2008-2017: Opel Insignia (OPEL Insignia A) G09)
2008-2017 Opel Insignia A Saloon G09
2008-2017 Opel Insignia A Sports Tourer G09
2011 onwards Opel Zafira Tourer C P12
2012 onwards Vauxhall Astra Mk VI Sedan P10)

Core Functions
Hydraulic Pressure Generation: Converts the mechanical force of the driver pressing the clutch pedal into hydraulic pressure, providing a power source for the entire clutch hydraulic system.
Pedal Feel Feedback: Precise internal piston return spring design ensures moderate pedal force and smooth rebound, enhancing the driving experience.
Sealing and Leak Prevention System: Double protection with main and auxiliary seals prevents brake fluid (hydraulic oil) leakage from the reservoir and pushrod.
High Temperature and Corrosion Resistance: The cylinder body is made of aluminum alloy with an anodized surface treatment, resisting high engine compartment temperatures and brake fluid corrosion.
Integrated Reservoir Design: Some configurations feature an integrated reservoir for convenient level checking and replenishment, reducing pipe connection points.
Ready-to-Use Compatibility: Mounting bracket holes, pushrod length, and pipe interface threads are all manufactured according to GM/Opel original factory standards.

OE Number Comparison
OE Number Source Explanation
679081 GM/Opel Original Factory OE Number
55561915 GM/Opel Original Factory OE Number (Facelift/Sub-number)
96829721 GM/Opel Genuine OE Parts (Regional Version)

What problems can this XUI3042S solve for your overseas customers?

OE parts are expensive: GM/Opel genuine clutch master cylinders are imported from Europe or South Korea, resulting in high unit prices and long lead times (usually 6-12 weeks), squeezing customer profit margins. XUI3042S offers equivalent OE quality at a 25%-45% lower price, helping customers rebuild price competitiveness.
Three OE numbers in one inventory: Three original equipment manufacturer (OEM) numbers correspond to one product model, reducing SKUs by two-thirds, streamlining inventory management, and accelerating capital turnover.
Universal platform with multi-model coverage: One model covers over ten models across Chevrolet, Opel, and Vauxhall brands, eliminating the need for separate inventory for each brand and broadening sales coverage.
Core European market models: Cruze, Astra, and Insignia are all models with significant market share in Europe, ensuring stable and predictable after-sales service demand and sustainable customer orders.
Own-brand premium: Supports neutral packaging and customized brand packaging, helping customers escape the predicament of "selling other people's brands" and establish long-term brand assets and end-market pricing power.

Addressing customer pain points

OEM parts supply disruptions or price increases: Some early OE numbers are discontinued or have limited supply, leading to significant fluctuations in GM aftermarket parts pricing. XUI3042S maintains stable production, ensuring the security of the customer's supply chain.

Inconsistent quality of aftermarket parts: Low-priced alternatives on the market often suffer from poor sealing, cylinder block sand holes, and pushrod length deviations, leading to high customer return rates and high after-sales costs. We use OE-grade aluminum alloy materials and precision machining processes, controlling the return rate to within 1%.

Difficult installation and adaptation: Manufactured strictly according to universal/Opel original factory installation dimensions and thread specifications, with 100% matching of mounting bracket holes, pushrod length, and pipe interfaces, ensuring zero installation obstacles for technicians.

High threshold for small-batch trial orders: Some factories require a minimum order quantity of 500 pieces. We support flexible minimum orders to help new customers reduce trial order risks and financial pressure.

Uncontrollable delivery time: Original parts are greatly affected by production scheduling and sea freight. Our regular delivery time is 2-3 weeks, and urgent orders can be compressed to 7-10 days, helping customers cope with sudden replenishment and peak season demands.

Q1: What is the difference between XUI3042S and XUI3042?
A: The two products may belong to different configuration versions of the same product series. The XUI3042S is designed specifically for GM's Gamma/Delta platform vehicles, compatible with models such as the Chevrolet Cruze, Opel Astra J, and Insignia A. Please check the OE number and vehicle year for specific differences.

Q2: Is this master cylinder an original or aftermarket part?
A: It is an OE quality replacement (Aftermarket OE Replacement). We manufacture it according to GM/Opel original drawings and TS16949 quality standards. Its installation dimensions and performance parameters are completely identical to 679081/55561915/96829721, making it 100% replaceable.

Q3: Why can the same product replace three OE numbers?
A: 679081, 55561915, and 96829721 are the same specification clutch master cylinder released by GM in different years, factories, or regional markets. There are no substantial differences in installation dimensions and hydraulic performance. The XUI3042S covers these three numbers through a unified design, helping customers simplify inventory management.