Honda Prelude 1993 Service Manual page 879

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Master Cylinder
1. Construction
A tandem master cylinder is used to improve th€ safety of the braking system. In addition, center valves ara usod so
as to match the anti-lock brake svstem oDeration.
The master cylinder has one reservoir tank which is connected to the cylinder sections by two small holes. lt has two
pistons: primary and secondary, which are crisscross connected with the cslipers so that the fluid pressure works
separately on each system (front right wheel & rear left wheel, and front left wheel & resr right wheell.
A stop bolt for controlling movement of the primary piston is provided at the side of the master cylindet body. A r€€d
switch for detecting the brake tluid volume is also provided in the cap of the reservoi, tank.
2. Ooeration
When the brake pedal is depressed, the secondary piston is pushed through the brake booster and the conter valve B
is closed so that fluid pressure is generated on the secondary side. At the same time, the p,imary piston is push6d by
the sscondary fluid pressure and the center valve A is closed so that braking fluid pressure is generated both on th€
primary and secondary sides.
When the brake pedal is released, the primary and secondary pistons are returned to the original position by the
brake fluid pressure and piston spring.
(cont'dl
CENTER VALVE B