warning light come on "brake'?
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Senior User
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warning light come on "brake'?
My 79 ford f150 warning light "brake" come on
so brake is fine i check master cylinder fluid still full and parking brake pedal keep up
but red light still on? how can i solve? but brake pads and shoe and hose is good
no leak.
so brake is fine i check master cylinder fluid still full and parking brake pedal keep up
but red light still on? how can i solve? but brake pads and shoe and hose is good
no leak.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Unplug the switch at the proportioning valve, see if the light goes out. If it stays on, there is a wiring problem.
If you did a repair and the light is still on, the valve needs to be centered. Crack open one of the bleeder valves on a front wheel. Slowly depress the brake pedal, if the light goes out, stop. Close the bleeder valve and check to see if the light stays out. If the pedal reaches the floor but the light doesn't go out, repeat the same procedure on one of the rear wheels.
If you did a repair and the light is still on, the valve needs to be centered. Crack open one of the bleeder valves on a front wheel. Slowly depress the brake pedal, if the light goes out, stop. Close the bleeder valve and check to see if the light stays out. If the pedal reaches the floor but the light doesn't go out, repeat the same procedure on one of the rear wheels.
Thread Starter
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Senior User
Joined: Apr 2011
Posts: 277
Likes: 1
Unplug the switch at the proportioning valve, see if the light goes out. If it stays on, there is a wiring problem.
If you did a repair and the light is still on, the valve needs to be centered. Crack open one of the bleeder valves on a front wheel. Slowly depress the brake pedal, if the light goes out, stop. Close the bleeder valve and check to see if the light stays out. If the pedal reaches the floor but the light doesn't go out, repeat the same procedure on one of the rear wheels.
If you did a repair and the light is still on, the valve needs to be centered. Crack open one of the bleeder valves on a front wheel. Slowly depress the brake pedal, if the light goes out, stop. Close the bleeder valve and check to see if the light stays out. If the pedal reaches the floor but the light doesn't go out, repeat the same procedure on one of the rear wheels.
and n had not repair for brake before..
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
It can't. These Fords didn't have a parking brake warning light, there is no switch for it.
The only thing the "BRAKE" warning light indicates is a problem with the hydraulic brakes system. Technically what it indicates is an imbalance between the front and rear brake system pressure.
The only thing the "BRAKE" warning light indicates is a problem with the hydraulic brakes system. Technically what it indicates is an imbalance between the front and rear brake system pressure.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Applications: 1968/79 F100/350, Bronco & Econoline / 1968/69 FoMoCo Passenger Cars.
This plastic switch is a POS, develops cracks in its threads causing brake fluid to seep out.
When this occurres, the low brake fluid warning lamp on the dash comes on...and stays on!
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Rusty Roller
Joined: Oct 2011
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From: Santa Cruz Mountains
Just as a side note. I pulled three used switches from the wrecking yards and they were all bad..... That makes 5 counting the 2 I had in spares for my other truck.
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Ford Parts Specialist
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From: Simi Valley, CA
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The feed wire for the switch is part of another harness. You'll have to find one of the vehicles the switch was used in, cut the feed wire off, splice it to your harness.
Posting Guru
Joined: Dec 2009
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From: Mississippi
Possibly but it may still indicate that the piston inside the valve is still not centered. Chilton's procedure is: turn the ignition to the ACC position, check brake fluid level is 1/4'' from top, apply pressure to the pedal to center the piston.
Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
Found one in an F100. Paid $1. Cut and soldered it in with shrink wrap. Works great.
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