Single-piston Wheel-cylinder Shoe-expander.
Single-piston wheel-cylinder
(Fig. 28.41).
single piston wheel cylinder
Similar to the double-piston units, the single-piston units are bolted to the back-plate. These units work in similar way to that of the double-piston ones, except that the cylinder has a blind end to form the anchor abutment for the other shoe. Either the ring-seal or the cup seal with a seal-spreader and retainer-spring is used to seal the piston.
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