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Depends on the mileage of this car, it can be one of the elctric valves on the injector pump or the pump itself. You need to check the solenoid valve as well (it is an electro-magnetic valve that opens or closes, check the mini-filters underneath these valves. When this does not help than you need to get your pump either fixed or replaced, last function is very costly.
hi from uk this sounds like you have no servo assistance with brakes? if your engine is diesel? then the vacuum pump is not providing assistance there are different methods of haw vac pump is driven? some are driven off rear of alternator/ off the rear of camshaft ? if petrol engine ? the vac is a pipe from inlet manifold connected to servo unit this pipe has also a none return valve fitted may i suggest whether diesel or petrol engine you check the hoses from pump to the servo ? also if alternator driven pump? check fanbelt? if ok then to check if pump is fault? pull out the hose /pipe from the grommet entry point on servo unit and with engine running ? you should feel vacuum if you put finger over the end ? no vac ?? you will have to check the drive coupling from alternator if diesel engine ? if you come back with more info after tests above ? may be able to advise further?