Hello, Please can someone advise? I have been told by a garage that my brake fluid is low, although there is no warning light on the system. I drive a B Class 2018 model, so it is still under warranty. The garage is quoting a lot of money which seems very unreasonable. In order to maintain the warranty and benefit from the Roadside Assistance programme do I need to get the brake fluid topped up by a garage which used original parts? The brake fluid is not replenished at service - so is it necessary to use only mercedes approved brake fluid or can a local cheaper garage do it for the warranty and roadside assistance to be preserved? Thank you.