DESCRIPTION Master cylinder (Brakes) (page 2 of 2)

The recuperation seals momentarily collapse allowing When the brakes are off, the fluid can move fluid in chambers ’B’ and ’D’, which is unaffected by unrestricted between the dual line system and the the movement of the plungers, to flow through the separate reservoirs in the fluid supply tank. When the holes in the plungers, over the collapsed seals and footbrake is applied, the primary plunger assembly into chambers ’A’ and ’C’ respectively. The movement moves up the cylinder bore and the pressure created of fluid from one set of chambers to the other, is acts in conjunction with the primary spring to compensated for by fluid from the separate reservoirs overcome the secondary springs, thus moving the in the supply tank moving through the feed holes in secondary plunger assembly up the bore at the same the cylinder. Conversely, the final return movement of time. Initial movement of both plungers takes the the plunger assemblies causes the extra fluid in recuperating seals past the cut-off holes in the chambers ’A’ and ’C’ to move through the cut off holes cylinder chambers ’A’ and ’C’, and applies pressure to into the fluid reservoir. the fliud in those chambers, which is directed to the respective cylinders of each of the separate circuits. The servo unit provides controlled power assistance to to the brake pedal when pressure is applied. The fluid in chambers ’B’ and ’D’ is unaffected by Vacuum is obtained from the depression in the inlet movement of the plungers and can move unrestricted manifold. The vacuum is applied to both sides of a between the separate chambers and respective flexing diaphragm and by admitting atmosheric reservoirs in the fluid supply tank, both before and pressure to the rear diaphragm, assistance is during brake application. When the brakes are obtained. The servo unit is mounted between the released, the plunger assemblies, aided by the return brake pedal and master cylinder and is linked to these springs are retracted faster than the fluid; this creates by push rods. Should a vacuum failure occur, the two a depression between the fluid in chambers ’A’ and ’C’ push rods will act as a single rod allowing the brakes and the recuperation seals. to function in the normal way, although more effort will be required to operate the brake pedal.