I appreciate what you are saying but I live a non confrontational life. I try not to do stress. It has taken 3 visits with the caravan to the dealer to resolve this problem so it's cost me time and money but I'm happy to move on and carry on caravanning. . .
It is obviously entirely your own choice, but when customers simply accept poor service or products without complaint with consequences, as if that's "The best they can expect" it lets both the dealer and manufacture off the hook, when they are actually entirely liable for producing and selling faulty or even dangerous goods.
Unless both dealers and sellers are held accountable for their failures, they have no incentive to improve, and they will continue to be lax in the same way and will cause issues for other customers.
In your specific case, the caravan was sold with faulty brakes. That is an issue, which could have have had very serious consequences. It also reflects poorly on the dealership firstly for not checking the brakes for their effectiveness in all modes of operation prior to delivering the caravan to you, but also for their lack of professionalism when you made a legitimate complaint to them.
I am only pleased that neither you or anyone else was actually injured becasue of the brake issue.
I appreciate your may not be looking for compensation, but sadly without such consequences for both the dealer and the manufacturer, I strongly suspect that absolutely nothing will have changed to improve both the manufacture, and dealer PDI of the caravans.
You at least deserve a letter from the dealer (as they are the other party in this contract) admitting their liability (which cannot be refuted given the circumstances of your case) and expressing their remorse for selling a dangerously faulty product.
You would have been entirely within your rights to have formally rejected the caravan to the dealer, which would have had far more serious consequences for the dealer, They should be very grateful you didn't use your statutory rights under the Consumer Rights Act.
As I commented at the top I accept it is your right to choose whether to take this matter further or not and on that basis I will leave it there.