Vehicle load responsive brake actuating pressure proportioner and actuating linkage therefor

A vehicle load responsive brake actuating pressure proportioner and actuating linkage therefor comprising:

• a suspension arrangement for a vehicle including a suspension control arm and a suspension spring and a seat mounted on said control arm and on which one end of said suspension spring is seated, said suspension spring being loaded in accordance with vehicle load;
• said proportioner having a housing secured to said control arm and a variable proportioning piston movable in said housing and adapted to proportion brake actuating pressure therethrough, a proportioning spring loaded in compression to resist proportioning movement of said piston in accordance with vehicle load to modify the proportioning action of said piston accordingly, a plunger engaging said proportioning piston and movable in said housing to load said proportioning spring in accordance with vehicle load;
• and means transmitting proportionate amounts of vehicle load on said suspension spring from said spring seat to said plunger and to said control arm to load said plunger and therefore said proportioner spring and said proportioning piston in accordance with the load on said suspension spring to modify the proportioning action of said proportioning piston in accordance with changes in vehicle load as represented by the load on said suspension spring, said transmitting means including a member engaging and movable with said plunger, and at least two levers having first ends fulcrumed on said control arm and second ends fulcrumed on said member;
• said spring seat having pivot points thereon engaging said levers in force transmitting relation at fulcrum points intermediate said lever first and second ends so that the relationship of the distance from said lever ends to said fulcrum points establishes the proportion of vehicle load transmitted from said spring seat to said plunger and to said control arm.