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Home , Rim (wheel), Steering, Steering wheel

Nat’l Highway Traffic Safety Admin., DOT § 570.60

(1) Inspection procedure. Examine vis- (b) play. Free play in the ually for the condition indicated, linkage shall not exceed the measuring as necessary. values shown in Table 3. (c) Friction materials. On each , (1) Inspection procedure. Elevate the the thickness of the lining or pad shall front end of the to load the ball not be less than one thirty-second of an joints, if the vehicle is so equipped. In- inch over the fastener, or one-sixteenth sure that bearings are correctly of an inch over the brake shoe on bond- adjusted. Grasp the front and rear of a ed linings or pads. Brake linings and and attempt to turn the tire and pads shall not have cracks or breaks wheel assemble left and right. If the that extend to rivet holes except minor free movement at the front or rear cracks that do not impair attachment. The wire in wire-backed lining shall tread of the tire exceeds the applicable not be visible on the friction surface. value shown in Table 3, there is exces- linings shall be securely sive steering linkage play. attached to brake shoes. pads shall be securely attached to shoe TABLE 3. FRONT WHEEL STEERING LINKAGE plates. FREE PLAY (1) Inspection procedure. Examine vis- Play ually for the conditions indicated, and Nominal bead diameter or size (inches) (inches) measure the height of the rubbing sur- 1 face of the lining over the fastener 16 or less ...... ⁄4 16.01 through 18.00 ...... 3⁄8 heads. Measure bonded lining thickness 18.01 or more ...... 1⁄2 over the surface at the thinnest point on the lining or pad. (c) Free turning. Steering shall (d) Structural and mechanical parts. turn freely through the limit of travel Backing plates, brake spiders and cal- in both directions. iper assemblies shall not be deformed (1) Inspection procedure. With the en- or cracked. System parts shall not be gine running on a vehicle with power broken, misaligned, missing, binding, steering, or the steerable wheels ele- or show evidence of severe wear. Auto- vated on a vehicle without power steer- matic adjusters and other parts shall ing, turn the through be assembled and installed correctly. the limit of travel in both directions. (1) Inspection procedure. Examine vis- ually for conditions indicated. Feel for binding or jamming in the steering gear . § 570.60 Steering system. (d) Alignment. -in or toe-out con- (a) System play. Lash or free play in dition shall not be greater than 1.5 the steering system shall not exceed times the values listed in the vehicle the values shown in Table 2. manufacturer’s service specification (1) Inspection procedure. With the en- for alignment setting. gine on and the steering wheels in (1) Inspection procedure. Drive the ve- the straight ahead position, turn the hicle over a sideslip indicator or meas- steering wheel in one direction until ure with a tread gauge, and verify that there is a perceptible movement of the the toe-in or toe-out is not greater wheel. If a point on the steering wheel than 1.5 times the values listed in the rim moves more than the value shown vehicle manufacturer’s service speci- in Table 1 before perceptible return fication. movement of the wheel under observa- (e) system. The power tion, there is excessive lash or free play steering system shall not have cracked, in the steering system. frayed or slipping belts, chafed or abrated hoses, show signs of leakage or TABLE 2. STEERING WHEEL FREE PLAY VALUES have insufficient fluid in the reservoir. (1) Inspection procedure. Examine Steering wheel diameter (inches) Lash (inches) fluid reservoir, hoses and pump belts 16 or less ...... 2 for the conditions indicated. 18 ...... 21⁄4 NOTE: Inspection of the suspension system 20 ...... 21⁄2 must not precede the service brake perform- 22 ...... 23⁄4 ance test.

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