Brake switch
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
It’s called the pressure differential switch I believe.
It sets off a light in the dash when pressure drops in either the front or back circuits.
Moves the shuttle inside the proportioning valve and trips the switch. Are you sure the switch is bad, they get replaced a lot, but aren’t always the problem.
Is your light on constantly? If so, make sure it’s the switch, and not the circuit, or the shuttle in the valve.
Or even more importantly, a leak in the system!
It sets off a light in the dash when pressure drops in either the front or back circuits.
Moves the shuttle inside the proportioning valve and trips the switch. Are you sure the switch is bad, they get replaced a lot, but aren’t always the problem.
Is your light on constantly? If so, make sure it’s the switch, and not the circuit, or the shuttle in the valve.
Or even more importantly, a leak in the system!
Fleet Mechanic
Joined: Feb 2022
Posts: 1,377
Likes: 709
https://www.npdlink.com/product/warn...1977&year=1977
As mentioned, check all of the other possible issues for the leak as well.
As mentioned, check all of the other possible issues for the leak as well.
Thread
Thread Starter
Forum
Replies
Last Post
Rollbar
1961 - 1966 F-100 & Larger F-Series Trucks
4
Jan 13, 2020 08:16 PM
columbia1spring
1973 - 1979 F-100 & Larger F-Series Trucks
8
Jun 25, 2018 01:11 PM
