A multiple trailer train combination consisting of a tractor and two trailers is spec'd to haul close to maximum loads.Throughout axles in the rig,where would you find the lowest relay valve crack pressures if the rig is spec'd for balanced braking?

Question

Quizplus · Accepted Answer

The lowest relay valve crack pressures are typically found on the rear axles of the pup trailer in a multiple trailer train combination spec'd for balanced braking. This is because the braking system is designed to apply braking force in a manner that prevents jackknifing and ensures stability, starting with the rear of the combination and moving forward.

A Multiple Trailer Train Combination Consisting of a Tractor and Two