SAE J2995

Annotation of standard text SAE J2995 :

To assess the strength and durability for hydraulic brake components as a function of test conditions. These conditions may include: braking torque, hill-holding, braking forces, hydraulic pressure, brake temperatures, environmental and corrosion effects, vibration, and time. This RP includes a systematic reference to other test methods and provides new test methods for durability life prediction based on the VDA 311 for operating strength for brake calipers. When using AK load collectives from vehicle testing for life prediction, the nominal vehicle life corresponds to 300000 km. Braking torques and forces take into account inputs from non-ABS, ABS, EPB, and ESC systems. It also applies to gasoline, diesel, hybrid, and electric vehicles. This RP applies to vehicles below 4540 kg of GVWR. With the appropriate engineering review and assessment for a given test program, this RP can apply (or be used) to scale the duty cycle (or special collective) to reflect regional, on-road special applications, or vehicles up to 7 tons of GVWR.

Except for the AK load collectives, which have proven correlation to customer usage, the damage content of other procedures requires (a) the quantification with actual laboratory testing to develop the corresponding S/N curves, and (b) the calculation of the equivalent damage at the test conditions for a given load collective.

The hydraulic components covered by this RP include:

• a

Non-vacuum apply system (brake booster and master cylinder)

b

ABS modules

c

Service, IPB, and EPB calipers

d

Proportioning valves

e

Wheel cylinders

This RP has an accompanying electronic appendix with the tabular presentation as a spreadsheet of different test procedures by type and by component.

SUBJECT TAXONOMY: Chassis, Braking systems, Maintainability and supportability, Liability, Hydraulic systems, Durability, Tests and Testing, Test procedures

SUBFILE: Automotive

TYPE OF DOCUMENT: Ground Vehicle Standard