Early 1970’s American colour movie. Set somewhere in Africa.
Truck going down narrow road on side of a mountain loses its brakes and can’t stop.
A Land Rover behind it overtakes it and slows down allowing the truck to eventually stop by running into the back of it.
The drivers of the truck and Land Rover know each other. The Land Rover has to beep the truck several times before the truck realises that the Land Rover wants to pass it, after which the Land Rover slows down the truck.
Sorcerer (1977)?
https://www.imdb.com/title/tt0076740/?ref_=fn_al_tt_1
I don’t think that was – I watched it before 1975.
The truck coming down the mountain side had people in it possibly including children.
Possibly Chuck Connors was driving the Land Rover or the truck?
“Cowboy in Africa” (1967-68 TV series)?
It was a movie rather than a TV series. Looks similar though…