brake issue
Thread Starter
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Freshman User
Joined: Dec 2009
Posts: 26
Likes: 1
From: Hamburg, Pa.
brake issue
First I'd like to say Hello and what a great site. I wish I would have found this place sooner.
Now the issue.
I have a 93 F150 5.0 that I purchased about a year ago. I replaced the booster and master cylinder ( the master cylinder was leaking). I bled the master cylinder and the brake system and have good brakes. When appling the brakes the brake lights go on and off until the pedal is fully depressed. The only problem with this is while under braking they wont stay lit. I did a search on here and found somewhat of a similar issue that recommended to replace the switch on the pedal. Since I don't think this was an issue before I changed the booster and master cylinder could it be something from that causing my problem?
Now the issue.
I have a 93 F150 5.0 that I purchased about a year ago. I replaced the booster and master cylinder ( the master cylinder was leaking). I bled the master cylinder and the brake system and have good brakes. When appling the brakes the brake lights go on and off until the pedal is fully depressed. The only problem with this is while under braking they wont stay lit. I did a search on here and found somewhat of a similar issue that recommended to replace the switch on the pedal. Since I don't think this was an issue before I changed the booster and master cylinder could it be something from that causing my problem?
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
Not likely. The brake lights are controlled by the pedal switch only. I don't know how hard it would be change on a 93 [as in I don't know how much other crap is in the way], but it's pretty basic- practically unplug the old one and plug back in the new one. The only thing you have to watch is that it's properly adjusted as it screws into place, so if it's not screwed in far enough or not all the way, either the lights won't come on when they should or they'll be on all the time.
Posting Guru
Joined: May 2006
Posts: 2,486
Likes: 0
From: Iowa
Are you sure theres enough fluid in the resivore?
myne was low and it would give me a brake light until i hit the brakes, causing the fluid to slosh up on to the sensor and make the light go off. And then the light would come back on after i slowed. Just a thought.
myne was low and it would give me a brake light until i hit the brakes, causing the fluid to slosh up on to the sensor and make the light go off. And then the light would come back on after i slowed. Just a thought.
Thread Starter
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Freshman User
Joined: Dec 2009
Posts: 26
Likes: 1
From: Hamburg, Pa.
Hey guys thanks for the responses.
Actually pretty easy to get to. This one though isn't the screw in kind.
I did check the fluid and it is full.
While I was out checking this. I think I have a better explaination of what its doing.
As you push on the brake pedal all is fine, then the pedal goes a little soft this is when the brake lights go out. This cycle is repeated until you are at a full stop with firm pressure on the pedal.
Any thoughts ?
Actually pretty easy to get to. This one though isn't the screw in kind.
I did check the fluid and it is full.
While I was out checking this. I think I have a better explaination of what its doing.
As you push on the brake pedal all is fine, then the pedal goes a little soft this is when the brake lights go out. This cycle is repeated until you are at a full stop with firm pressure on the pedal.
Any thoughts ?
