Interpretation ID: nht74-5.32

DATE: 04/12/74

FROM: AUTHOR UNAVAILABLE; L. R. Schneider; NHTSA

TO: Chrysler Corporation

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your March 13, 1974, request for confirmation that the intake manifold connector and the brake booster check valve used in connecting the engine intake manifold and the vacuum power brake booster are not subject to Standard 106, Brake hoses.

A brake hose end fitting is defined in Standard 106 as "a coupler, other than a clamp, designed for attachment to the end of a brake hose." As pictured in your schematic, the couplers are the clamps, and the intake manifold connection and brake booster check valve are engine components to which the brake hose has been attached by the clamp couplers. Therefore your interpretation is correct that neither component is subject to Standard 106.

SINCERELY,

March 13, 1977

Elwood T. Driver Director, Office of Operating Systems National Highway Traffic Safety Administration

Re: Docket 1-5; Notice 10 Amendment to MVSS 106 Brake Hoses

Chrysler Corporation requests confirmation of the informal interpretation provided to us by a member of your staff concerning the recently amended requirements of MVSS 106 (39 F.R. 7435) as they apply to the hook-up between the engine intake manifold and the vacuum power brake booster. To make this hook-up one end of a section of vacuum brake hose is slipped onto the intake manifold connector and the other end is slipped onto the brake booster check valve as shown in the attached schematic of this system. The hose is held secure at each end by a spring type hose clamp.

In accordance with that conversation it is our understanding that the vacuum hose used to connect the intake manifold to brake booster is a brake hose within the meaning of the standard. However, since this hose is secured by clamps, it is not a brake hose assembly under the standard and, therefore, the intake manifold connector and the brake booster check valve are not subject to the requirements of MVSS 106. This is in keeping with the amendment to the definition of brake hose assembly deleting the reference to "clamps."

In view of the short time period allowed for compliance with the new requirements, prompt confirmation of our interpretation is requested.

R. O. Sornson Manager Environmental and Safety Relations (Graphics omitted)

BRAKE BOOSTER CHECK VALVE

VAC BRAKE HOSE

VAC HOSE CLAMP

INTAKE MANIFOLD CONNECTOR

ENGINE MANIFOLD