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Loss of vacuum
The brake booster relies on engine vacuum to operate correctly. There would be a fleixible hose between the inlet manifold and the pipe that runs along the body
to the booster. Over time
(and the car is ten years old) the flexible hoses becomes
very soft and perished or flakes of on the inside closes up under vacuum and reduces the amount of vacuum flow to the booster paticularly if you pump the pedal. There is also a non return valve in the system to maintain maximum vacuum in the booster when the car is being driven hard and there is very little vacuum in the inlet manifold. Check ALL flexible hoses, non return valve and the fitting on the inlet manifold for blockages. Another test is to remove the hose off the booster with the enine idling and check the flow. It will make the engine run a little rough if it is sucking in fresh air but if it is blocked it probably will not make much difference.
Let me know how you go, remember do the SIMPLE THINGS FIRST.
Regards
Roxy
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