| 摘要 |
A drum brake assembly (10) including a rotatable drum having a radially inner braking surface and a brake shoe (11) of single piece construction and of generally circular form mounted within the drum against a backing plate (12). The brake shoe (11) has a radially outer face (18) and a friction lining (16,17) mounted thereon in facing relationship to the radially inner braking surface. Actuating means (13) having actuated brake on and released brake off conditions and being operable in the actuated condition to diametrically expand the brake shoe (11) is provided. Positioning means (21) are also provided for positioning the brake shoe (11) within the drum when the actuating means (13) is in the brake off condition to provide for complete clearance between the outer face (18) of the friction lining (16, 17) and the inner braking surface of the drum. A grinding jig for grinding friction lining is also provided and a brake assembly having connecting means for connecting the brake shoe to the backing plate.
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