| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric booster which is secured in its reliability.SOLUTION: An electric booster has a groove section 53 formed on a face opposite to a cup seal 55 of an annular wall portion 51B of a spacer 51 (cylindrical member) and communicating between an inner hole 52 of the spacer 51 and an outer circumference of the spacer 51. Therefore, in an assembling inspection of the cup seal 55, even in a state where the cup seal 55 normally assembled sticks on the annular wall portion 51B of the spacer 51, a pressure from a back side of the cup seal 55 reaches a primary chamber 16 through the groove section 53 and the pressure can be detected. Thus, false determination can be prevented. |
