The servo is a large circular vessel which bolts onto the bulkhead inside the engine compartment,and the master cylinder bolts onto it.
The servo multiplies the force you apply to the pedal, so that the master cylinder rod is forced harder into the cylinder and increases the braking effort
The master cylinder will be identified by the hydraulic pipes leading to it from the brakes. The servo will be identified from the flexible pipe linking it to the inlet manifold on a petrol engine, or in your case to an exhauster (a vacuum pump) operated by one of the drive belts or from the end of the cambelt
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