1998 Buick Riviera Owner's Manual

BrakingBraking action involves perception time andreaction time.First, you have to decide to push on the brake pedal.That’s perception time. Then you have to bring up yourfoot and do it. That’s reaction time.Average reaction time is about 314 of a second. Butthat’s only an average. It might be less with one driverand as long as two or three seconds or more withanother. Age, physical condition, alertness, coordinationand eyesight all play a part. So do alcohol, drugs andfrustration. But even in 314 of a second, a vehiclemoving at 60 mph (100 km/h) travels 66 feet (20 m).That could be a lot of distance in an emergency, sokeeping enough space between your vehicle and othersis important.And, of course, actual stopping distances vary greatlywith the surface of the road (whether it’s pavement orgravel); the condition of the road (wet, dry, icy); tiretread; the condition of your brakes; the weight of thevehicle and the amount of brake force applied.Avoid needless heavy braking. Some people drive inspurts -- heavy acceleration followed by heavybraking -- rather than keeping pace with traffic. This is amistake. Your brakes may not have time to cool betweenhard stops. Your brakes will wear out much faster if youdo a lot of heavy braking. If you keep pace with thetraffic and allow realistic following distances, you willeliminate a lot of unnecessary braking. That meansbetter braking and longer brake life.If your engine ever stops while you’re driving, brakenormally but don’t pump your brakes. If you do, thepedal may get harder to push down. If your enginestops, you will still have some power brake assist. Butyou will use it when you brake. Once the power assist isused up, it may take longer to stop and the brake pedalwill be harder to push.