| 摘要 |
The invention relates to vehicle braking system pressure modulating valves of the kind in which, above a first threshold of master cylinder pressure, the brake pressure increases with increasing master cylinder pressure but at a reduced rate, this rate being increased when a second threshold of master cylinder pressure is reached. In the valve according to the invention a primary plunger and a secondary plunger are carried in separate bores in the valve housing, there being a lost motion connection between them. Primary spring determines the first threshold pressure and secondary spring determines the second threshold pressure.
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