Reduce speed and shift to a lower gear before you start down a long or steep downgrade. If you don’t shift down, you might have to use your brakes so much that they would get hot and no longer operate efficiently.
On a long uphill grade, shift down and reduce your speed to around 70 km/h (45 mph) to reduce the possibility of engine and transaxle overheating.
If your trailer weighs more than the maximum trailer weight without trailer brakes and you have an automatic transaxle, you should drive in D (Drive) when towing a trailer.
Operating your vehicle in D (Drive) when towing a trailer will minimize heat build up and extend the life of your transaxle.
CAUTION
Turn signals when towing a trailer
Parking on hillsKia Cee'd JD Owners Manual: Good driving practices
Never take the vehicle out of gear and
coast down a hill. This is extremely
hazardous. Always leave the vehicle in
gear.
Don't "ride" the brakes. This can cause
them to overheat and malfunction.
Instead, when you are driving down a
long hill, slow down and shift to a lower
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Kia Cee'd JD Service Manual: Center Fascia Panel Components and components location
Component Location
1. Center fascia panel
...