GTL Services

Friction Materials, Brakes, Transmissions, Components

Established in 1970 as an extension of the business of building special test machines, Greening Testing Laboratories, Inc. (GTL) was the first independent brake and friction material test facility in the U.S. Over the last 40 years we have been innovators in the areas of test development, data analysis, and methodologies for the transportation industries. GTL continues to push the technology envelope, simulating "in service" environments in the laboratory. We are committed to continuous improvement by re-investing and updating our facilities, enabling us to provide our clients the most accurate and cost effective engineering test services available. Greening personnel actively participate in numerous American and International technical societies and committees involved with developing test procedures and performance standards for automotive components and assemblies.

GTL is active in or accredited by the Society of Automotive Engineers (SAE), the American Society for Testing and Material (ASTM), the Automotive Manufacturers Equipment Compliance Agency (AMECA), and the American Association of Motor Vehicle Administrators (AAMVA). We are ISO 17025 Laboratory Accredited by the American Association for Laboratory Accreditation (A2LA).

COMMERCIAL VEHICLE BRAKE DYNAMOMETER TEST DESCRIPTIONS

AREA OF INTEREST

EXAMPLE TEST PROCEDURES

Performance

FMVSS 121, SAE, ISO, JASO, Industry

Lining Certification Programs

TMC RP-628, APTA BTS-SS-RP-002-05

Durability

SAE J2115, ISO 26867, JASO, Industry, Other

Rotor/Drum Cracking

SAE J2686, ISO, Industry

Moisture/Contaminant Sensitivity

Effects of Moisture and Debris on Brake Noise, Durability, and Performance

Noise Screening

Sound Pressure Levels and Frequencies Under Varied Driving Conditions

Parking Brake

Drawbar Simulation, Performance at Various Grades and Temperatures

Vehicle Test Simulation

Simulation of LA City Traffic, Jennerstown Mountain Descent

Laboratory Testing Services
Transmission Assemblies and Subassemblies	Fluid Characterization and Durability Studies Friction Material Assessments, Clutches
Brake Shoe / Spider Fatigue / Slack Adjuster	SAE J1462, Procedures to suit individual requirements
Spin/Burst	Flywheels, Clutch Assemblies
Rotary Fatigue	Rotary Fatigue Axial Loading of Hub, Bearing, or Wheel Assemblies
Vibration	Road Load/Profile, Acceleration/Frequency Sweeps
Engineering Consulting and Advanced Data Analysis Services	Interpretation of Results and Design Validation

Friction Material Properties Tests
Compressibility	Friction Material Compressibility at Various Temperatures and Loads
Flexural Strength	Material Mechanical Integrity
Dimensional Stability	Friction Material Expansion and Distortion at High Temperatures
Material Sample Screening and Fingerprinting	Effectiveness, Fade and Wear Characteristics – CHASE & F.A.S.T. Tests
Environmental	Corrosion and Effects of Friction Material on Rotor Material
Shear Strength	Friction Material to Backing Plate Bond Integrity
Friction Material Certification	VESC V-3 (AMECA) Edge Code Registration

Vehicle Testing Services
Brake System Performance and Benchmarking	Measurement of Vehicle Braking Performance Including Deceleration, Brake System Pressures, Temperature, Wheel Torque, Pedal Force, Pedal Travel, NVH Accelerometers, Microphones, Velocity and Distance
Brake System Balance	Front/Rear Brake Output Brake Pressures, Torques and Speeds
Vehicle Testing Services	Over the Road Vehicle Testing (ORVT), OBDII, Mileage Accumulation, Complete Instrumentation Services

This information provides only a small glimpse of the testing services and test equipment Greening offers.

Let our experienced team assist with your unique requirements.