Dacia,

Had a similar problem on a previous car, turned out to be a failing brake servo.

It was sucking fluid from the brake resovior and burning it when I accelerated, hence the terrible noise.

To rule this out, check if the vacuum line from the brake servo to the inlet manifold is dry.......

__________________
Paul Gibbons
'93 320CE
'73 Jensen Interceptor (Resting)
Giant Full Sus Mountain Bike