Hi Jamu
I had something similar hapen to my Ranger.
Take a look under the bonet, and look at your pneumatic vaccum solenoids (see pictures)
One of mine had been bumped and broken by a grease monkey, when it went in for a new clutch kit.
The outlet pipe had been broken off.
If the pneumatic system is 'open' ,then your RFW will not engage or disengage...or worse, you'll be doing 100km/h + and it will suddenly engage
There are two vaccum pumps, one is the RFW & the other your rear diff lock.
They are R1060 ex vat (each), new from the agents, but check scrap yards.
I picked up 2 off of a Ranger that had been whacked from behind for R175 for both.
Hope this helps.
Cheers
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