daniel wrote:All I'm asking is for Nissan to tell us if they've thought of this (I presume they have, but I'd like to hear them say it) and what particular method(s) they've implemented to deal with it.
Daniel - It's good that you care about having brakes that work. But let me start with a question: What do you drive now? Do you have a statement from the manufacturer that they sized the brakes correctly for the car? Actually, you do. If the car is certified to be on US roads, it must meet US safety standards - and that includes brake performance.
"These Federal safety standards are regulations written in terms of minimum safety performance requirements for motor vehicles or items of motor vehicle equipment. These requirements are specified in such a manner "that the public is protected against unreasonable risk of crashes occurring as a result of the design, construction, or performance of motor vehicles and is also protected against unreasonable risk of death or injury in the event crashes do occur."
Standard No. 135 - Light Vehicle Brake Systems
- Passenger Cars (Effective 3-6-95), Multipurpose Passenger Vehicles, Trucks and Buses (Effective 12-1-97)
This standard specifies requirements for vehicles equipped with hydraulic and electric service brakes and parking brake systems to ensure safe braking performance under normal conditions and emergency conditions. Manufacturers of passenger cars and multipurpose passenger vehicles, trucks and buses with a gross vehicle weight rating less than or equal to 3,500 kg (7,716 lbs.) may certify compliance with either FMVSS No. 105, described earlier in this booklet, or FMVSS No. 135. The options expire on September 1, 2000 for passenger cars and on September 1, 2002 for other vehicles, on which dates compliance with FMVSS No. 135 is mandatory.
How will this affect you?
The FMVSS standards are designed to assure new vehicles are capable of stopping within a certain distance deemed necessary for safe driving. FMVSS 135 is the current standard and applies to 2000 and newer cars, and 2002 and newer light trucks. Compared to the earlier FMVSS 105 standard, FMVSS 135 requires roughly a 25% reduction in pedal effort for the same stopping distance.
FMVSS 135 says all vehicles under 10,000 lbs. gross vehicle weight (GVW), except motorcycles, must be capable of stopping within a distance of no more than 230 feet (70 meters) from 62 mph (100 km/h) with cold brakes (under 212 F or 100 C) and with no more pedal effort than 368 ft. lbs. (500 N).
In July 2005, these same requirements were extended to trucks and buses weighing more than 10,000 lbs. Formerly, only school buses had to meet the same stopping requirements as passenger cars and light trucks.
The FMVSS 135 standard also specifies a required stopping distance for vehicles should the power brakes fail (no power assist), or if one of the two hydraulic circuits fail. Under these conditions, the maximum stopping distance from 62 mph (100 km/h) is not to exceed 551 feet (168 meters) with a maximum pedal effort of no more than 368 ft. lbs. (500 N). FMVSS 135 also has a stopping requirement in the event of an anti-lock brake (ABS) system failure. The rules require the stopping distance not to exceed 279 feet (85 meters) with a maximum pedal effort of no more than 368 ft. lbs. (500 N).
There is also a hot performance stopping requirement for fade resistance. With the brakes hot, the maximum stopping distance for the second of two back-to-back panic stops is not to exceed 292 ft. (89 meters) with the same pedal effort as before (368 ft. lbs. or 500 N). The parking brakes are also covered by FMVSS 135. The rules specify conditions under which the parking brake must be able to hold the vehicle on both an uphill and downhill incline.