Ok here's a problem for you.

Earlier in the week the brake "servo" assistance died leaving me having the brake the old fashioned way with lots of force on the pedal.

As cossie peeps will know, its not a vacuum type set up but uses a pump to pressurise a hydraulic accumulator to offer brake assistance.

Checked the obvious fuses, wiring etc and all fine there.

Pump makes noises....

so stripped down the unit and removed it all from the car for an inspection.

There are no blocks in the low pressure pipework from resevoir.

You cant see much of the pump internals but it turns freely and smoothly and no bits of metal in the pump outlet filter.

bench tested the pump motor and pressure switch. pump motor turns fine and pressure switch is working.

So this leaves me with a dilema.

the only things i can think could not be working is:

Impellor blades in pump broken off
Accumulator bag broken so holds no pressure
leak in master cylinder unit.

Car has no ABS system. There are no external leaks on the brake lines/system and the fluid level hadnt dropped. Have not been experiencing brake fade or any other abnormal symptoms, the servo assistance just suddenly died.

I dont think theres an internal link within the master cylinder as if there was I would expect pressure to build, then "bleed" away as it leaks into other chambers of the master cylinder. Plus without servo assistance the brakes hold fine and dont fade away either.

So im thinking its the first two.

Anyone had similar problem?? any ideas??