But the brigade has said despite massive reductions in its budget, it has no immediate plans to make any firefighters redundant.
The FBU said its research had found that because of cuts to central Government grants to fire authorities, over the next three years 6,000 firefighter posts will be axed.
Fewer firefighters will mean it will take longer to get to a fire or other emergency, which will mean a risk to life and more property damage, the union says.
Matt Wrack, FBU general secretary, said: "We're over-stretched now, and frontline crews are making it clear we'll be at breaking point when the cuts really bite over the next two years. The simple fact is that cuts cost lives."
A spokesman for West Midlands Fire Service said: "We are considering a number of proposals which may affect our future operating models - including the potential for redundancies.
"At this stage there are no plans to issue any formal announcement regarding redundancies."
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Written by Evening Mail