GMW GMW16501 PDF

This specification covers light wall vacuum brake hoses for use in power braking systems of vehicles.

Material Description. Materials covered by this specification are divided into two (2) Types. It is possible for a hose to be approved to more than one (1) Type.

• Type A1 hose is suitable for use to temperatures of +125 °C continuous exposure, and +150 °C excursion exposure.

• Type A2 hose is suitable for use to temperatures of +125 °C continuous exposure, and +150 °C excursion exposure but higher compression set values than Type A1.

• Type B1 hose is suitable for use to temperatures of +150 °C continuous exposure and +175 °C excursion exposure.

• Type B2 hose is suitable for use to temperatures of +150 °C continuous exposure and +175 °C excursion exposure with higher changes in properties than Type B1.

Construction. The hose shall consist of a smooth tube of Ethylene Propylene Diene Monomer (EPDM) elastomer reinforced with a ply or plies of braided, knit, spiral, or woven polyester or other vendee approved fabric and furnished with a cover of EPDM elastomer. Hoses shall be black unless otherwise specified. Hose shall conform to the dimensions and tolerances listed in Appendix A; Table A1. The hose shall be legibly marked with the following information:

• Symbol DOT.

• Nominal inside diameter (expressed as fraction of inch).

• Hose manufacturer’s code identification.

• Date code; the symbol VL; and the GM specification number (GMW16501).

Such markings shall be printed parallel to the axis in white or blue block letters not