What is the purpose of front brake limiting valves found on some older vehicles?
a.To increase front brake pressure on slippery roads
b.To reduce front brake pressure to prevent front wheel skids on slippery surfaces
c.To lock the front brakes during emergency stops
d.To balance air between the primary and secondary systems
Explanation
Front brake limiting valves were used on older vehicles to reduce air pressure to the front brakes, typically to about 50 percent of normal, on slippery surfaces. This was to help prevent front wheel lockup and loss of steering control.