Federal Register - August 5, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Proposed Rules TABLE ISTOPPING SEQUENCEContinued Truck tractors Parking Brake Test at GVWR S5.6
Manual Adjustment of Brakes
60 mph Service Brake Stops at LLVW S5.3.1
60 mph Emergency Service Brake Stops at LLVW S5.7.1
Parking Brake Test at LLVW S5.6
Final Inspection
Single unit trucks and buses
6
7
8
9
10
11
4
6
7
8
9
10
TABLE IISTOPPING DISTANCE IN FEET
Vehicle speed in miles per hour 30
35
40
45
50
55
60
Service brake 1
2
70
96
125
158
195
236
280
3
78
106
138
175
216
261
310
Emergency brake
4
65
89
114
144
176
212
250
5
78
106
138
175
216
261
310
6
84
114
149
189
233
281
335
7
61
84
108
136
166
199
235
8
170
225
288
358
435
520
613
186
250
325
409
504
608
720
Note:
1 Loaded and Unloaded Buses.
2 Loaded Single-Unit Trucks.
3 Loaded Tractors with Two Axles; or with Three Axles and a GVWR of 70,000 lbs. or less; or with Four or More Axles and a GVWR of 85,000 lbs. or less. Tested with an Unbraked Control Trailer.
4 Loaded Tractors with Three Axles and a GVWR greater than 70,000 lbs.; or with Four or More Axles and a GVWR greater than 85,000 lbs.
Tested with an Unbraked Control Trailer.
5 Unloaded Single-Unit Trucks.
6 Unloaded Tractors Bobtail.
7 All Vehicles except Tractors, Loaded and Unloaded.
8 Unloaded Tractors Bobtail.
TABLE IIASTOPPING DISTANCE IN FEET: OPTIONAL REQUIREMENTS FOR: 1 THREE-AXLE TRACTORS WITH A FRONT
AXLE THAT HAS A GAWR OF 14,600 POUNDS OR LESS, AND WITH TWO REAR DRIVE AXLES THAT HAVE A COMBINED GAWR OF 45,000 POUNDS OR LESS, MANUFACTURED BEFORE AUGUST 1, 2011; AND 2 ALL OTHER TRACTORS MANUFACTURED BEFORE AUGUST 1, 2013
Service Brake
Emergency Brake
Vehicle speed in miles per hour 1
30
35
40
45
50
55
60
2
70
96
125
158
195
236
280
3
78
106
138
175
216
261
310
4
84
114
149
189
233
281
335
5
89
121
158
200
247
299
355
6
170
225
288
358
435
520
613
186
250
325
409
504
608
720
Note: 1 Loaded and unloaded buses; 2 Loaded single unit trucks; 3 Unloaded truck tractors and single unit trucks; 4 Loaded truck tractors tested with an unbraked control trailer; 5 All vehicles except truck tractors; 6 Unloaded truck tractors.
5. Amend 571.122 by revising paragraphs S6.1.1.1, S6.1.1.2, S6.1.1.3, and S6.9.7.1a to read as follows:
khammond on DSKJM1Z7X2PROD with PROPOSALS
571.122 Standard No. 122; Motorcycle brake systems.
S6.1.1.1 High friction surface. A
high friction surface is used for all dynamic brake tests excluding the ABS
tests where a low-friction surface is specified. The high-friction surface test area is a clean, dry and level surface, with a gradient of 1 percent. The high-
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friction surface has a peak braking coefficient PBC of 1.02.
S6.1.1.2 Low-friction surface. A lowfriction surface is used for ABS tests where a low-friction surface is specified.
The low-friction surface test area is a clean and level surface, which may be wet or dry, with a gradient of 1
percent. The low-friction surface has a PBC of 0.50.
S6.1.1.3 Measurement of PBC. The PBC is measured using the ASTM
F249319 standard reference test tire, in accordance with ASTM E133719, at a
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speed of 64 km/h both publications incorporated by reference; see 571.5.
S6.9.7.1
a Test surfaces. A low friction surface immediately followed by a high friction surface with a PBC 0.90.
6. Amend 571.126 by revising paragraph S6.2.2 to read as follows:
571.126 Standard No. 126; Electronic stability control systems for light vehicles.
E:FRFM05AUP1.SGM
05AUP1
