Vehicle braking system with valving to control spring applied br

Details Vehicle braking system with valving to control spring applied br Vehicle braking system with valving to control spring applied br

1979-03-20

1980-12-16

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 9, 303 13, 303 71, 303 84R, B60T 1300

Patent

active

042392934

ABSTRACT:
A vehicle braking system incorporating two circuits serving driven and non-driven axles respectively and in which both air-actuated service brake units and spring brake units for parking are provided on both axles. The system includes relay valving which is operable upon failure of the service braking in either circuit and responsive to the service pressure in the other circuit to provide a graduated actuation of the spring brake units in the circuit where service braking has failed. The spring brake on the driven axle and/or the relay valving is so constructed as to attenuate the force applied by the spring brake units on the driven axle.

REFERENCES:
patent: 3456988 (1969-07-01), Gibbons et al.
patent: 3863992 (1975-02-01), Kurke et al.
patent: 4003605 (1977-01-01), Fannin

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