Interpretation ID: nht73-2.26

DATE: 02/26/73 EST

FROM: ROBERT L. CARTER -- NHTSA ASSOCIATE ADMINISTRATOR FOR MOTOR VEHICLE PROGRAMS

TO: LOUIS C. LUNDSTROM -- DIRECTOR, AUTOMOTIVE SAFETY ENGINEERING ENVIRONMENTAL ACTIVITIES STAFF GENERAL MOTORS CORPORATION

COPYEE: C.R. SHARP

TITLE: N40-30 [ZTV]

TEXT: Dear Mr. Lundstrom:

This is in reply to your request of February 1, 1973, for an interpretation of paragraph S5.4.1 of Motor Vehicle Safety Standard No. 105a. You have asked if "a master cylinder with a dam at the 25 percent capacity level" would meet the requirements of the standard.

The paragraph in question requires a "reservoir compartment for each service brake subsystem serviced by the master cylinder" with the further requirement that "loss of fluid from one compartment shall not result in a complete loss of brake fluid from another compartment". In our view, a master cylinder with a dam at the 25 percent level would be compartmentalized within the meaning of S5.4.1.

Sincerely,