doc518 wrote:
My Xantia has an intermittant problem. Sometimes, at low speed ,
when I start to brake the engine seems to race and the car starts to
speed up. Very disconcerting !
Problem goes away the instant the brake is released and then I can
brake normally.

Heard of this before ????

I get that sometimes on small cars, I have large feet and catch the edge of
the accellerator pedal ! Some vehicles have a noticeable kick when the air
con compressor comes in. Since yours is intermittent I expect you will have
to let it develop (as my neighbour says)