Industry-Verified Manufacturing Data (2026)

Reservoir

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Reservoir used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Reservoir is characterized by the integration of Reservoir Cap and Fluid Level Sensor. In industrial production environments, manufacturers listed on CNFX commonly emphasize Polypropylene construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A container that stores brake fluid for the brake master cylinder system.

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Product Specifications

Technical details and manufacturing context for Reservoir

Definition
The reservoir is a critical component of the brake master cylinder assembly that holds and supplies brake fluid to the hydraulic braking system. It maintains the proper fluid level to ensure consistent brake pressure and compensates for fluid displacement during brake pad wear and temperature changes.
Working Principle
The reservoir stores brake fluid under atmospheric pressure and supplies it to the master cylinder chambers through ports. As brake fluid is consumed during braking or leaks occur, the reservoir replenishes the system. It typically has separate compartments for the primary and secondary circuits in dual-circuit braking systems.
Common Materials
Polypropylene, Nylon, Polyethylene
Technical Parameters
  • Fluid capacity of the reservoir (ml) Per Request
Components / BOM
  • Reservoir Cap
    Seals the reservoir opening to prevent contamination and fluid evaporation
    Material: Plastic with rubber seal
  • Fluid Level Sensor
    Monitors brake fluid level and triggers warning light when low
    Material: Plastic with electrical contacts
  • Mounting Bracket
    Secures the reservoir to the master cylinder or vehicle body
    Material: Steel or plastic
Engineering Reasoning
0.5-10.0 bar
15.0 bar internal pressure
Design Rationale: Yield strength of polyethylene terephthalate (PET) reservoir material (55 MPa) exceeded at 15.0 bar internal pressure, causing permanent plastic deformation and potential rupture
Risk Mitigation (FMEA)
Trigger Brake fluid glycol ether absorption exceeding 3.0% by volume
Mode: Reservoir wall swelling and dimensional instability
Strategy: Implement multilayer coextrusion with ethylene vinyl alcohol (EVOH) barrier layer (oxygen transmission rate <0.1 cm³/m²/day at 23°C)
Trigger Cyclic pressure fluctuation at 2.0 Hz with amplitude >5.0 bar
Mode: High-cycle fatigue crack initiation at injection molding gate locations
Strategy: Redesign with radiused gate transitions (minimum 2.0 mm radius) and glass fiber reinforcement (30% by weight)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Reservoir.

brake fluid reservoir for master cylinder polypropylene brake fluid container automotive brake reservoir with sensor nylon brake fluid reservoir bracket motor vehicle brake system reservoir

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Brake Master Cylinder
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Fluid volume capacity: 0.1-2.0 L, Material: Polypropylene or Nylon
temperature: -40°C to 120°C
Media Compatibility
✓ DOT 3/4/5.1 brake fluid ✓ Glycol-based hydraulic fluids ✓ Mineral oil
Unsuitable: Chlorinated solvents or strong acids
Sizing Data Required
  • Required fluid volume (L)
  • Master cylinder bore size (mm)
  • Vehicle/system mounting constraints

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion and pitting
Cause: Chemical attack from stored fluids, atmospheric exposure, or galvanic corrosion due to incompatible materials, leading to wall thinning and eventual leaks.
Structural fatigue cracking
Cause: Cyclic loading from pressure variations, thermal expansion/contraction, or vibration from connected equipment, resulting in crack initiation and propagation.
Maintenance Indicators
  • Visible weeping, staining, or active leaks at seams, welds, or connections
  • Abnormal audible hissing or dripping sounds indicating pressure loss or internal flow issues
Engineering Tips
  • Implement routine ultrasonic thickness testing and corrosion mapping to monitor wall integrity and schedule proactive repairs before failure occurs.
  • Install and maintain proper pressure relief devices and overfill protection systems to prevent over-pressurization and stress beyond design limits.

Compliance & Manufacturing Standards

Reference Standards
ISO 11439:2013 (Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles) ASTM A240/A240M (Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications) ASME Boiler and Pressure Vessel Code, Section VIII (Rules for Construction of Pressure Vessels)
Manufacturing Precision
  • Wall Thickness: +/-5% of nominal thickness
  • Cylindricality: 0.5% of diameter
Quality Inspection
  • Hydrostatic Pressure Test (to verify structural integrity and leak tightness)
  • Ultrasonic Testing (UT) for wall thickness measurement and defect detection

Factories Producing Reservoir

Verified manufacturers with capability to produce this product in China

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✓ 94% Supplier Capability Match Found

P Procurement Specialist from United Arab Emirates Jan 31, 2026
★★★★★
"Standard OEM quality for Motor Vehicle Manufacturing applications. The Reservoir arrived with full certification."
Technical Specifications Verified
T Technical Director from Australia Jan 28, 2026
★★★★★
"Great transparency on the Reservoir components. Essential for our Motor Vehicle Manufacturing supply chain."
Technical Specifications Verified
P Project Engineer from Singapore Jan 25, 2026
★★★★★
"The Reservoir we sourced perfectly fits our Motor Vehicle Manufacturing production line requirements."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

8 sourcing managers are analyzing this specification now. Last inquiry for Reservoir from Thailand (27m ago).

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Frequently Asked Questions

What materials are used in manufacturing this brake fluid reservoir?

This reservoir is constructed from durable materials including polypropylene, nylon, and polyethylene, ensuring chemical resistance and long-term reliability in automotive brake systems.

What components are included in the brake fluid reservoir BOM?

The bill of materials includes a fluid level sensor for monitoring brake fluid levels, a mounting bracket for secure installation, and a reservoir cap to prevent contamination and evaporation.

How does this reservoir integrate with the brake master cylinder system?

This reservoir stores and supplies brake fluid to the master cylinder, maintaining proper hydraulic pressure for responsive braking. The fluid level sensor alerts drivers when fluid needs replenishment.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Motor Vehicle Manufacturing sector.

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