The PCT was to start charging staff at Upton Hospital in Slough and King Edward VII Hospital in Windsor from 29 September and at St Mark's Hospital in Maidenhead from last week.
Although parking fees have been brought in for patients, plans to charge staff have been put on hold for three weeks to allow for further consultation.
Under the proposal, staff who use their cars for work - such as district nurses - can apply for permits but everyone else would have to pay£1 to park for two hours,£2 for up to four hours and£10 for any longer period.
Parking was previously free for everyone. The trust said that its car parks were being used by people who 'don't work here or need to be on our site'.
Lise Llewellyn, Berkshire East PCT chief executive, said: 'We thought we had been talking but obviously not enough and we are going to sit down and look at the options.'
NT's 'Free Parking' campaign calls for dropping charges for NHS staff. Support it by displaying the 'parking permit'.