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美国制动液标准 FMVSS-116-2002 DOT

49 CFR Ch. V (10–1–02 Edition)§571.115

§571.115[Reserved]

§571.116Standard No. 116; Motor ve-hicle brake fluids.

S1. Scope. This standard specifies re-quirements for fluids for use in hydrau-lic brake systems of motor vehicles, containers for these fluids, and labeling of the containers.

S2. Purpose. The purpose of this standard is to reduce failures in the hy-draulic braking systems of motor vehi-cles which may occur because of the manufacture or use of improper or con-taminated fluid.

S3. Application. This standard applies to all fluid for use in hydraulic brake systems of motor vehicles. In addition, S5.3 applies to passenger cars, multi-purpose passenger vehicles, trucks, buses, trailers, and motorcycles.

S4. Definitions.

Blister means a cavity or sac on the surface of a brake cup.

Brake fluid means a liquid designed for use in a motor vehicle hydraulic brake system in which it will contact elastomeric components made of sty-rene and butadiene rubber (SBR), ethylene and propylene rubber (EPR), polychloroprene (CR) brake hose inner tube stock or natural rubber (NR). Chipping means a condition in which small pieces are missing from the outer surface of a brake cup.

Duplicate samples means two samples of brake fluid taken from a single packaged lot and tested simulta-neously.

Hydraulic system mineral oil means a mineral-oil-based fluid designed for use in motor vehicle hydraulic brake sys-tems in which the fluid is not in con-tact with components made of SBR, EPR or NR.

Packager means any person who fills containers with brake fluid that are subsequently distributed for retail sale. Packaged lot is that quantity of brake fluid shipped by the manufacturer to the packager in a single container, or that quantity of brake fluid manufac-tured by a single plant run of 24 hours or less, through the same processing equipment and with no change in in-gredients.

Scuffing means a visible erosion of a portion of the outer surface of a brake cup.

A silicone base brake fluid (SBBF) is a brake fluid which consists of not less than 70 percent by weight of a diorgano polysiloxane.

Sloughing means degradation of a brake cup as evidenced by the presence of carbon black loosely held on the brake cup surface, such that a visible black streak is produced when the cup, with a 500±10 gram deadweight on it, is drawn base down over a sheet of white bond paper placed on a firm flat sur-face.

Stickiness means a condition on the surface of a brake cup such that fibers will be pulled from a wad of U.S.P. ab-sorbent cotton when it is drawn across the surface.

S5. Requirements. This section speci-fies performance requirements for DOT 3, DOT 4 and DOT 5 brake fluids; re-quirements for brake fluid certifi-cation; and requirements for container sealing, labeling and color coding for brake fluids and hydraulic system min-eral oils. Where a range of tolerances is specified, the brake fluid shall meet the requirements at all points within the range.

S5.1Brake fluid. When tested in ac-cordance with S6, brake fluids shall meet the following requirements:

S5.1.1Equilibrium reflux boiling point (ERBP). When brake fluid is tested ac-cording to S6.1, the ERBP shall not be less than the following value for the grade indicated:

(a) DOT 3: 205 °C. (401 °F.).

(b) DOT 4: 230 °C. (446 °F.).

(c) DOT 5: 260 °C. (500 °F.).

S5.1.2Wet ERBP. When brake fluid is tested according to S6.2, the wet ERBP shall not be less than the fol-lowing value for the grade indicated:

(a) DOT 3: 140 °C. (284 °F.).

(b) DOT 4: 155 °C. (311 °F.).

(c) DOT 5: 1 180 °C. (356 °F.).

S5.1.3. Kinematic viscosities. When brake fluid is tested according to S6.3, the kinematic viscosities in square millimeters per second at stated tem-peratures shall be neither less than 1.5 mm2/s at 100 °C. (212 °F.) nor more than the following maximum value for the grade indicated:

(a) DOT 3: 1,500 mm2/s at minus 40 °C. (minus 40 °F.).

(b) DOT 4: 1,800 mm2/s at minus 40 °C. (minus 40 °F.).