Brake light issue
Thread Starter
|
Freshman User
Joined: May 2013
Posts: 26
Likes: 0
Brake light issue
All,
I decided to replace the rear brake lines. Each step resulted in another problem. Ended up pulling all the lines and hoses and replacing with stainless. Replaced cylinders, master cylinder, power booster, and proportioning valve. Finished and bled the system today. Brakes work better than ever BUT, the **** brake lights stay on, even with the truck off. I have to disconnect the battery now.
Can somebody throw some suggestions my way? This didn't happen before and I didn't touch anything electrical. I no longer have enough patience. Every part I addressed on this brake overhaul resulted in serious frustration already (rusted bolts and fittings, lines so old and they snapped, etc). Prior owner did not provide tender loving care . . . . .
Truck is 1979 F150 Ranger 4X4 with 400m.
I decided to replace the rear brake lines. Each step resulted in another problem. Ended up pulling all the lines and hoses and replacing with stainless. Replaced cylinders, master cylinder, power booster, and proportioning valve. Finished and bled the system today. Brakes work better than ever BUT, the **** brake lights stay on, even with the truck off. I have to disconnect the battery now.
Can somebody throw some suggestions my way? This didn't happen before and I didn't touch anything electrical. I no longer have enough patience. Every part I addressed on this brake overhaul resulted in serious frustration already (rusted bolts and fittings, lines so old and they snapped, etc). Prior owner did not provide tender loving care . . . . .
Truck is 1979 F150 Ranger 4X4 with 400m.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Check the brake light switch under the dash. They used a stamped steel barrel nut to retain them and it's common for them to push through the nut, allowing the switch to stay "on".
New switches come with stamped steel hex nuts to prevent this.
New switches come with stamped steel hex nuts to prevent this.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,148
Likes: 5,783
From: S/W Missouri, Polk county
"Brake lights" or "brake" system warning light on r/h side of the instrument cluster? mikeo0o0o0 suggestion if it's the reg pedal brake lights and the other, check the elec connector on the proportional valve. Un-plug it from the pro valve and see if it goes out.
The proportional valve piston will go one direction or the other if it senses a major leak in the system and trip the light. Some times you have to recenter the piston to un-trip the light after bleeding the brakes. Some say give it a firm stomp, after bleeding them??
Does your replacement pro valve have a little pin sticking out on the end to push in or pull out (based off GVW)? I think it's usually pull and hold out (with a v shaped piece of thin sheet metal, like 2 or 3 16th's" thick) when bleeding the brakes?
Some manuals cover it, some don't.
The proportional valve piston will go one direction or the other if it senses a major leak in the system and trip the light. Some times you have to recenter the piston to un-trip the light after bleeding the brakes. Some say give it a firm stomp, after bleeding them??
Does your replacement pro valve have a little pin sticking out on the end to push in or pull out (based off GVW)? I think it's usually pull and hold out (with a v shaped piece of thin sheet metal, like 2 or 3 16th's" thick) when bleeding the brakes?
Some manuals cover it, some don't.
Thread Starter
|
Freshman User
Joined: May 2013
Posts: 26
Likes: 0
Thanks, guys! Very helpful. Still learning, I admit. I will check the switch first thing when I get back home. The pictures are appreciated!!
No warning lights are going off. Thankfully, I was instructed on how to properly bleed the brakes before starting -- by pulling the pin on the proportioning valve out and holding it there with vice grips.
This is such and awesome place to go for pointers. Glad I found it!
No warning lights are going off. Thankfully, I was instructed on how to properly bleed the brakes before starting -- by pulling the pin on the proportioning valve out and holding it there with vice grips.
This is such and awesome place to go for pointers. Glad I found it!
Thread
Thread Starter
Forum
Replies
Last Post
WyoFlyFisher
1973 - 1979 F-100 & Larger F-Series Trucks
8
Dec 14, 2011 10:25 PM
M. P. Gray
1973 - 1979 F-100 & Larger F-Series Trucks
10
Dec 19, 2009 04:24 PM
alchemist1
1973 - 1979 F-100 & Larger F-Series Trucks
3
Apr 13, 2009 08:27 PM
