I agree with Ethel and I have said before on a thread in CB that it is unlikely to result in a prison sentence. From what you have said and if you are convicted, it was more of a driving error which came out of what you believed was a fault in your vehicle. It was not a sustained period of bad driving, it was a momentary lapse. You also have good mitigation. There is no evidence of drink, drugs, racing, larking about or mobile phones (and those are the sort of factors which MAY result in a prison sentence).
The CPS should disclose most of their evidence as part of "Advanced Disclosure" either at or prior to the first hearing. There will then be a plea before venue hearing - this is because dangerous driving is a triable either way offence, ie, it can be heard in the magistrates court or in the crown court (Judge and jury). The prosecutor will read the facts and the magistrates will decide whether their sentencing powers are sufficient (if convicted). if they think not, the matter will be adjourned for it to be committed to the Crown Court. If the magistrates accept jurisdiction, you then have the choice of whether to have the case heard in the magistrates court or to elect a crown court hearing. Only your solicitor can advise you on this because the evidence will help him or her form his advice properly.
You should discuss with your solicitor the possibility of obtaining your own expert evidence with regard to the phantom fault and also the possibility of entering alternative pleas (ie CPS may well accept a guilty plea to careless driving).