Brake light is on
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Junior User
Joined: Dec 2007
Posts: 70
Likes: 1
Brake light is on
Hi all-
Finally got some decent weather so I could get my truck going. I thought I had a brake leak, but it turns out all I had was air in the lines. My uncle had put back brakes on about 3 months ago, and I don't think he got them bled all the way. What had happened is the pedal would go to the floor, but you could pump them up and it would stop you. However, I was losing brake fluid in the resivoir for the rear brakes. In the one block drive from my Grandpa's house to mine, the brake light came on when the pedal went to the floor.
Anyhow, I got them bled, and I have good brakes, but the brake light is still on. My parking brake lever is in the released position. Do these trucks use the brake light for just the parking brake? Is there a switch somewhere that I could be missing? My truck has manual brakes, if that helps.
Thanks all, and hopefully this post isn't too confusing-
Andrew
Finally got some decent weather so I could get my truck going. I thought I had a brake leak, but it turns out all I had was air in the lines. My uncle had put back brakes on about 3 months ago, and I don't think he got them bled all the way. What had happened is the pedal would go to the floor, but you could pump them up and it would stop you. However, I was losing brake fluid in the resivoir for the rear brakes. In the one block drive from my Grandpa's house to mine, the brake light came on when the pedal went to the floor.
Anyhow, I got them bled, and I have good brakes, but the brake light is still on. My parking brake lever is in the released position. Do these trucks use the brake light for just the parking brake? Is there a switch somewhere that I could be missing? My truck has manual brakes, if that helps.
Thanks all, and hopefully this post isn't too confusing-
Andrew
Junior User
Joined: Feb 2005
Posts: 92
Likes: 0
From: Michigan
The light is for the brake system to let you know that there is a problem (ie no brakes) before you get to the stop light and find out. I would be suspect of the pressure switch on the bias valve located on the frame on the drivers side this is what turns the brake lamp on, the other possibility is a bad connection.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
No it's brake failure light,.
If everything has been fixed, lines have been bled, then turn the key to run and press real hard on the brake pedal to try and recenter the actuator rod to center and thus turn the brake warning light off.
If everything has been fixed, lines have been bled, then turn the key to run and press real hard on the brake pedal to try and recenter the actuator rod to center and thus turn the brake warning light off.
Elder User
Joined: Dec 2007
Posts: 739
Likes: 1
Just another idea. Examine the area behind the master cylinder for any signs of oddball rust or wet spots. One of the side effects of a master cylinder starting to go bad is what you've described with the pedal hitting the floor, and it returns after a few pumps. You might need to unbolt the master cylinder a few turns to make sure fluid is not going past the rear seal in the unit and entering the power brake booster. I've seen it happen a few times and it's really odd.
Basically if it's hitting the floor and then you have to pump it up? I'd lean towards the master cylinder or a wheel cylinder seeping fluid out. Have you checked directly under the drums---just where the drum meets the backing plate for any damp areas?
S-
Basically if it's hitting the floor and then you have to pump it up? I'd lean towards the master cylinder or a wheel cylinder seeping fluid out. Have you checked directly under the drums---just where the drum meets the backing plate for any damp areas?
S-
