Product Overview

The Railway Vacuum Brake Hose is a critical safety component designed for vacuum braking systems on locomotives, railcars, and rolling stock. Operating at vacuums up to 990 mbar, this hose provides the flexible connection required to transmit vacuum pressure across coupled vehicles, enabling reliable train braking performance.

Engineered for durability and reliability, the vacuum brake hose features a robust construction combining synthetic rubber with steel wire spiral reinforcement and multiple fabric plies. This design ensures the hose maintains its structural integrity under repeated flexing, pressure cycling, and exposure to harsh railway environments.

Key Features & Technical Benefits

Specifications (Quick Reference)

 

 

Parameter	Specification
Product Type	Railway Vacuum Brake Hose / Locomotive Brake Hose
Material	Rubber, steel wire, fabric reinforcement
Operating Vacuum	Up to 990 mbar
Operating Temperature	-25°C to +65°C / -40°C to +80°C (depending on spec)
Tensile Strength	≥14 MN/m²
Elongation at Break	≥500%
Inside Diameter Range	12.5 mm – 76 mm (customizable)
Outside Diameter Range	21 mm – 89 mm
Applicable Standards	AAR / BS 3682-2 / UIC (customizable)
Applications	Locomotives, passenger coaches, freight wagons

1. Scope of Application

This document defines the technical requirements, material specifications, construction details, and test criteria for the Railway Vacuum Brake Hose intended for use in vacuum braking systems on locomotives, railway wagons, passenger coaches, and rolling stock.

The hose is designed for operation at vacuums up to 990 mbar and within temperature ranges as specified per application requirements.

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2. Applicable Standards & References

 

 

Standard	Subject
AAR (Association of American Railroads)	Brake hose specifications for North American railways
BS 3682-2	British Standard for vacuum brake hose specifications
UIC (International Union of Railways)	International railway hose standards
EN 45545-2	Fire safety requirements for railway components (HL3 R22/R23)

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3. Construction

The railway vacuum brake hose shall comprise the following layers (from inner to outer):

 

 

Layer	Material / Description
Internal Wire Spiral	Galvanized steel wire, corrosion-resistant, coil count: 75–115 per meter depending on diameter
Inner Fabric Ply	High-strength fabric reinforcement, extending no more than 10.0 mm beyond the internal wire end
Rubber Lining	Uniform synthetic rubber lining throughout the full length, minimum thickness ≥3.2 mm, free from porosity or defects
Impregnated Fabric Ply	Fabric reinforcement throughout the hose length
End Fabric Reinforcement	Additional fabric reinforcement extending approx. 125 mm from each end
Fabric Cover	Ozone- and oil-resistant synthetic rubber cover over the entire hose length

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4. Dimensional Specifications

 

 

Designation (mm)	Min. Bore of Internal Spiral (mm)	Bore of Soft End (mm)	Distance of Wire from End (mm)	Diameter of Wire (mm)	Coils per Meter
12.5	12.5	21	51	2.0	110–115
19	19	27	51	2.0	110–115
25	25	33.5	51	2.0	95–102
32	32	41	51	2.65	75–82
38	38	48	51	2.65	75–82
51	51	59	51	3.35	75–82
63.5	63.5	76	57	3.35	75–82
76	76	89	63.5	3.35	75–82

Source: Industry standard vacuum brake hose specifications

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5. Material & Mechanical Properties

 

 

Property	Requirement	Test Method
Tensile Strength	≥14 MN/m²	ISO 37
Elongation at Break	≥500%	ISO 37
Adhesion Strength	Withstands 67N separation force; separation rate ≤25 mm/min
Ageing Resistance	After 168 hours at 70±1°C, results vary ≤20% from unaged values