a service brake system where the brakes on at least the front and rear wheels are operated by actuation of a single control (if the rear wheel and sidecar wheel are braked by the same brake system, this is regarded as the rear brake);
córas príomhchoscáin ina n-oibrítear, ar a laghad, na coscáin ar na rothaí tosaigh agus cúil trí rialaitheoir amháin a ghníomhú (má dhéantar coscánú ar an roth cúil agus ar roth an taobhchairr leis an gcóras coscánaithe céanna, meastar gurb é sin an coscán cúil);