1、225 Natl Highway Traffic Safety Admin., DOT Pt. 570 569.5 Applicability. (a) General. Except as provided in paragraph (b) of this section, this part applies to all motor vehicle regrooved or regroovable tires manufactured or regrooved after the effective date of the regulation. (b) Export. This part
2、 does not apply to regrooved or regroovable tires in-tended solely for export and so labeled or tagged. 34 FR 1150, Jan. 24, 1969. Redesignated at 35 FR 5118, Mar. 26, 1970 569.7 Requirements. (a) Regrooved tires. (1) Except as per-mitted by paragraph (a)(2) of this sec-tion, no person shall sell, o
3、ffer for sale, or introduce or deliver for introduction into interstate commerce regrooved tires produced by removing rubber from the surface of a worn tire tread to generate a new tread pattern. Any per-son who regrooves tires and leases them to owners or operators of motor vehicles and any person
4、who regrooves his own tires for use on motor vehicles is considered to be a person delivering for introduction into interstate com-merce within the meaning of this part. (2) A regrooved tire may be sold, of-fered for sale, or introduced for sale or delivered for introduction into inter-state commerc
5、e only if it conforms to each of the following requirements: (i) The tire being regrooved shall be a regroovable tire; (ii) After regrooving, cord material below the grooves shall have a protec-tive covering of tread material at least 332-inch thick; (iii) After regrooving, the new grooves generated
6、 into the tread mate-rial and any residual original molded tread groove which is at or below the new regrooved depth shall have a min-imum of 90 linear inches of tread edges per linear foot of the circumference; (iv) After regrooving, the new groove width generated into the tread mate-rial shall be
7、a minimum of 316-inch and a maximum of 516-inch; (v) After regrooving, all new grooves cut into the tread shall provide unob-structed fluid escape passages; and (vi) After regrooving, the tire shall not contain any of the following de-fects, as determined by a visual exam-ination of the tire either
8、mounted on the rim, or dismounted, whichever is applicable: (A) Cracking which extends to the fabric, (B) Groove cracks or wear extending to the fabric, or (C) Evidence of ply, tread, or sidewall separation; (vii) If the tire is siped by cutting the tread surface without removing rubber, the tire co
9、rd material shall not be damaged as a result of the siping proc-ess, and no sipe shall be deeper than the original or retread groove depth. (b) Siped regroovable tires. No person shall sell, offer for sale, or introduce for sale or deliver for introduction into interstate commerce a regroovable tire
10、 that has been siped by cutting the tread surface without removing rubber if the tire cord material is damaged as a result of the siping process, or if the tire is siped deeper than the original or retread groove depth. 39 FR 15039, Apr. 30, 1974, as amended at 42 FR 21613, Apr. 28, 1977 569.9 Label
11、ing of regroovable tires. (a) Regroovable tires. After August 30, 1969, each tire designed and con-structed for regrooving shall be labeled on both sidewalls with the word Regroovable molded on or into the tire in raised or recessed letters 0.025 to 0.040 inch. The word Regroovable shall be in lette
12、rs 0.38 to 0.50 inch in height and not less than 4 inches and not more than 6 inches in length. The lettering shall be located in the side-wall of the tire between the maximum section width and the bead in an area which will not be obstructed by the rim flange. 34 FR 1150, Jan. 24, 1969; 34 FR 1830,
13、 Feb. 7, 1969 PART 570VEHICLE IN USE INSPECTION STANDARDS Subpart AVehicles With GVWR of 10,000 Pounds or Less Sec. 570.1 Scope. 570.2 Purpose. 570.3 Applicability. 570.4 Definitions. 570.5 Service brake system. VerDate Mar2010 14:39 Dec 20, 2010 Jkt 220217 PO 00000 Frm 00235 Fmt 8010 Sfmt 8010 Y:SG
14、ML220217.XXX 220217jdjones on DSKHWCL6B1PROD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-226 49 CFR Ch. V (10110 Edition) 570.1 570.6 Brake power unit. 570.7 Steering systems. 570.8 Suspension systems. 570.9 Tires. 570.10 Wheel assemblies
15、. Subpart BVehicles With GVWR of More Than 10,000 Pounds 570.51 Scope. 570.52 Purpose. 570.53 Applicability. 570.54 Definitions. 570.55 Hydraulic brake system. 570.56 Vacuum brake assist unit and vacu-um brake system. 570.57 Air brake system and air-over-hy-draulic brake subsystem. 570.58 Electric b
16、rake system. 570.59 Service brake system. 570.60 Steering system. 570.61 Suspension system. 570.62 Tires. 570.63 Wheel assemblies. AUTHORITY: Secs. 103, 108, 119, Pub. L. 89 563, 80 Stat. 718 (15 U.S.C. 1392, 1397, 1407); delegation of authority at 49 CFR 1.50. Subpart AVehicles With GVWR of 10,000
17、Pounds or Less SOURCE: 38 FR 23950, Sept. 5, 1973, unless otherwise noted. 570.1 Scope. This part specifies standards and pro-cedures for inspection of hydraulic service brake systems, steering and suspension systems, and tire and wheel assemblies of motor vehicles in use. 570.2 Purpose. The purpose
18、 of this part is to estab-lish criteria for the inspection of motor vehicles by State inspection systems, in order to reduce death and injuries attributable to failure or inadequate performance of motor vehicle systems. 570.3 Applicability. This part does not in itself impose re-quirements on any pe
19、rson. It is in-tended to be implemented by States through the highway safety program standards issued under the Highway Safety Act (23 U.S.C. 402) with respect to inspection of motor vehicles with gross vehicle weight rating of 10,000 pounds or less, except motorcycles or trailers. 570.4 Definitions
20、. Unless otherwise indicated, all terms used in this part that are defined in 49 CFR part 571, Motor Vehicle Safety Standards, are used as defined in that part. 570.5 Service brake system. Unless otherwise noted, the force to be applied during inspection procedures to power-assisted and full-power b
21、rake systems is 25 lb, and to all other sys-tems, 50 lb. (a) Failure indicator. The brake sys-tem failure indicator lamp, if part of a vehicles original equipment, shall be operable. (This lamp is required by Federal Motor Vehicle Safety Standard No. 105, 49 CFR 571.105, on every new passenger car m
22、anufactured on or after January 1, 1968, and on other types of motor vehicles manufactured on or after September 1, 1975.) (1) Inspection procedure. Apply the parking brake and turn the ignition to start, or verify lamp operation by other means indicated by the vehicle manufacturer that the brake sy
23、stem failure indicator lamp is operable. (b) Brake system integrity. The brake system shall demonstrate integrity as indicated by no perceptible decrease in pedal height under a 125 pound force applied to the brake pedal or by no il-lumination of the brake system failure indicator lamp. The brake sy
24、stem shall withstand the application of force to the pedal without failure of any line or other part. (1) Inspection procedures. With the en-gine running on vehicles equipped with power brake systems, and the ignition turned to on in other vehicles, apply a force of 125 pounds to the brake pedal and
25、 hold for 10 seconds. Note any de-crease in pedal height, and whether the lamp illuminates. (c) Brake pedal reserve. When the brake pedal is fully depressed, the dis-tance that the pedal has traveled from its free position shall be not greater than 80 percent of the total distance from its free posi
26、tion to the floorboard or other object that restricts pedal travel. (1) Inspection procedure. Measure the distance (A) from the free pedal posi-tion to the floorboard or other object VerDate Mar2010 14:39 Dec 20, 2010 Jkt 220217 PO 00000 Frm 00236 Fmt 8010 Sfmt 8010 Y:SGML220217.XXX 220217jdjones on
27、 DSKHWCL6B1PROD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-227 Natl Highway Traffic Safety Admin., DOT 570.5 that restricts brake pedal travel. De-press the brake pedal, and with the force applied measure the distance (B) from the depres
28、sed pedal position to the floorboard or other object that re-stricts pedal travel. Determine the percentage as (AB)/A100. The engine must be operating when power-assisted brakes are checked. The pedal reserve check is not required for vehicles equipped with full power (cen-tral hydraulic) brake syst
29、ems, or to ve-hicles with brake systems designed to operate with greater than 80 percent pedal travel. (d) Service brake performance. Compli-ance with one of the following perform-ance criteria will satisfy the require-ments of this section. Verify that tire inflation pressure is within the limits r
30、ecommended by vehicle manufacturer before conducting either of the fol-lowing tests. (1) Roller-type or drive-on platform tests. The force applied by the brake on a front wheel or a rear wheel shall not differ by more than 20 percent from the force applied by the brake on the other front wheel or th
31、e other rear wheel re-spectively. (i) Inspection procedure. The vehicle shall be tested on a drive-on platform, or a roller-type brake analyzer with the capability of measuring equali-zation. The test shall be conducted in accordance with the test equipment manufacturers specifications. Note the lef
32、t to right brake force variance. (2) Road test. The service brake sys-tem shall stop the vehicle in a distance of 25 feet or less from a speed of 20 miles per hour without leaving a 12- foot-wide lane. (i) Inspection procedure. The road test shall be conducted on a level (not to exceed plus or minus
33、 one percent grade) dry, smooth, hard-surfaced road that is free from loose material, oil, or grease. The service brakes shall be ap-plied at a vehicle speed of 20 miles per hour and the vehicle shall be brought to a stop as specified. Measure the dis-tance required to stop. (e) Brake hoses and asse
34、mblies. Brake hoses shall not be mounted so as to contact the vehicle body or chassis. Hoses shall not be cracked, chafed, or flattened. Protective devices, such as rub rings, shall not be considered part of the hose or tubing. (1) Inspection procedure. Examine vis-ually, inspecting front brake hose
35、s through all wheel positions from full left to full right for conditions indi-cated. NOTE: To inspect for paragraphs (f), (g), and (h) of this section, remove at a minimum one front wheel and one rear wheel. (f) Disc and drum condition. If the drum is embossed with a maximum safe diameter dimension
36、 or the rotor is embossed with a minimum safety thickness dimension, the drum or disc shall be within the appropriate speci-fications. These dimensions will be found on motor vehicles manufactured since January 1, 1971, and may be found on vehicles manufactured for several years prior to that time.
37、If the drums and discs are not embossed, the drums and discs shall be within the manufac-turers specifications. (1) Inspection procedure. Examine vis-ually for condition indicated, meas-uring as necessary. (g) Friction materials. On each brake the thickness of the lining or pad shall not be less tha
38、n one thirty-second of an inch over the rivet heads, or the brake shoe on bonded linings or pads. Brake linings and pads shall not have cracks or breaks that extend to rivet holes ex-cept minor cracks that do not impair attachment. Drum brake linings shall be securely attached to brake shoes. Disc b
39、rake pads shall be securely at-tached to shoe plates. (1) Inspection procedure. Examine vis-ually for conditions indicated, and measure height of rubbing surface of lining over rivet heads. Measure bond-ed lining thickness over shoe surface at the thinnest point on the lining or pad. (h) Structural
40、and mechanical parts. Backing plates and caliper assemblies shall not be deformed or cracked. Sys-tem parts shall not be broken, mis-aligned, missing, binding, or show evi-dence of severe wear. Automatic ad-justers and other parts shall be assem-bled and installed correctly. (1) Inspection procedure
41、. Examine vis-ually for conditions indicated. 38 FR 23950, Sept. 5, 1973; 38 FR 25685, Sept. 14, 1973, as amended at 39 FR 12868, Apr. 9, 1974; 39 FR 17321, May 15, 1974 VerDate Mar2010 14:39 Dec 20, 2010 Jkt 220217 PO 00000 Frm 00237 Fmt 8010 Sfmt 8010 Y:SGML220217.XXX 220217jdjones on DSKHWCL6B1PR
42、OD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-228 49 CFR Ch. V (10110 Edition) 570.6 570.6 Brake power unit. (a) Vacuum hoses shall not be col-lapsed, abraded, broken, improperly mounted, or audibly leaking. With re-sidual vacuum exhaust
43、ed and a con-stant 25 pound force on the brake pedal, the pedal shall fall slightly when the engine is started, demonstrating integrity of the power assist system. This test is not applicable to vehicles equipped with full power brake system as the service brake performance test shall be considered
44、adequate test of system performance. (1) Inspection procedure. With engine running, examine hoses visually and aurally for conditions indicated. Stop engine and apply service brakes several times to destroy vacuum in system. Depress brake pedal with 25 pounds of force and while maintaining that forc
45、e, start the engine. If brake pedal does not fall slightly under force when the engine starts, there is a malfunction in the power assist system. 570.7 Steering systems. (a) System play. Lash or free play in the steering system shall not exceed values shown in Table 1. (1) Inspection procedure. With
46、 the en-gine on and the wheels in the straight ahead position, turn the steering wheel in one direction until there is a percep-tible movement of a front wheel. If a point on the steering wheel rim moves more than the value shown in Table 1 before perceptible return movement of the wheel under obser
47、vation, there is excessive lash or free play in the steer-ing system. TABLE 1STEERING SYSTEM FREE PLAY VALUES Steering wheel diameter (inches) Lash (inches) 16 or less . 2 18 . 214 TABLE 1STEERING SYSTEM FREE PLAY VALUESContinued Steering wheel diameter (inches) Lash (inches) 20 . 212 22 . 234 (b) L
48、inkage play. Free play in the steering linkage shall not exceed one- quarter of an inch. (1) Inspection procedure. Elevate the front end of the vehicle to load the ball joints. Insure that wheel bearings are correctly adjusted. Grasp the front and rear of a tire and attempt to turn the tire and whee
49、l assembly left and right. If the free movement at the front or rear tread of the tire exceeds one-quar-ter inch there is excessive steering linkage play. (c) Free turning. Steering wheels shall turn freely through the limit of travel in both directions. (1) Inspection procedure. Turn off steering wheel through the limit of travel in both directions. Feel for bind-ing or jamming in the steering gear mechanism. (d) Alignment. T
