Question about 1985 Ford F150

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My brake lights don't come on until the truck is completely stopped.

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Try adjusting the brake light switch under the dash it works off of the brake pedal its probably sticking and might need to be changed

Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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Sound sleek you have two problems. Check your brake fluid level immediately for the beeping and brake light on!
The check engine light is a completely different story.
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Yes,the newer cars need a strong battery or funny things happen. You'll need to replace your brake pedal switch or bleed the system properly. don-ohio (:^)

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Chevy cavalier - rear brake lights don't work. The center rear brake light does work as well as all other lights. Replaced the bulbs and fuse - no luck. From what I have been told, the turn signal...


Stop Lamp Circuit Description
The STOP HAZ fuse in the IP junction block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the center mounted stop lamp (CHMSL) and both left and right stop lamp assemblies. The left stop lamp is grounded at G304 and the right stop lamp is grounded at G304.

Check the ground ! Testing an not guessing is the way to find the problem . Do you know how to test automotive electrical systems an circuits using a DVOM - digital volt ohm meter ? How to use an read a wiring diagram to pin point testing areas in a wiring harness ?
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Stop Lamps Inoperative
Step
Action
Yes
No

2
Inspect the 20 Amp STOP HAZ fuse.
Is the STOP HAZ fuse open?
YES - Go to Step 11
NO - Go to Step 3
3
Use a test lamp in order to backprobe connector C1 of the brake switch connector between terminal A and ground. Refer to Circuit Testing in Wiring Systems.
Does the test lamp light?
YES - Go to Step 4
NO - Go to Step 5
4
With the brake switch closed, Test for positive battery voltage at terminal B of connector C1. Refer to Circuit Testing in Wiring Systems.
Is voltage present?
YES - Go to Step 6
NO - Go to Step 7
5
Repair the open or short to ground in the Fuse Output-Battery between the fuse block and the brake switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
YES - System OK
--
6
Use a test lamp in order to backprobe the turn/hazard headlamp switch assembly connector C2 terminal A and ground.
Depress the brake pedal.
Does the test lamp light?
YES - Go to Step 8
NO - Go to Step 9
7
Inspect the adjustment of the brake switch. If the adjustment is correct, replace the brake switch.
Is the repair complete?
YES - System OK
--
8
Replace the turn/hazard headlamp switch assembly.
Is the repair complete?
System OK
--
9
Repair the open in Stop Lamp Switch Output between the brake switch and the turn/hazard headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
System OK
--
10
With brake switch open test terminal A of the brake switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 11
NO - Go to Step 12
11
Repair short to ground in Fuse Output-Battery Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
12
Test the Stop Lamp Switch Output Circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
YES - Go to Step 13
NO - Go to Step 14
13
Repair short to ground in the Stop Lamp Switch Output Circuit. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--
14
Test terminals F,G,B and C on the Hazard Warning Switch for continuity to ground. Refer to Circuit Testing in Wiring Systems.
Is ground present?
Go to Step 15
--
15
Repair short to ground in suspect CKT. Refer to Wiring Repairs in Wiring Systems.
Is repair complete?
System OK
--


Jul 03, 2017 | 2000 Chevrolet Cavalier

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Replaced the brake light switch completely, but as soon I hit the brake pedal, the brake light warning light comes on again indicating that there is a light out in the rear. But all the lights are working,...


If this is a newer lexus, then its very clever. It WILL be a blown bulb, but when a bulb is out, the car lights the next nearset bulb to substitute. Have a closer look at the rear lights and check all the bulb filaments by eye.

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Abs light on and traction control light on


Check your brake pads and the conections.

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Clicking sound relative to RPMs while applying light brake


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May 05, 2010 | 1996 Nissan Maxima

1 Answer

The Brake Light Sign Wont Turn Off.


Have you checked the brake fluid level. It might have a float switch in the master cylinder.

Mar 24, 2009 | 1991 Acura Legend

1 Answer

Brake light switch


HI
IT WAS LOCATE IN UPPER OF THE BRAKE PEDAL
BEFORE YOU CHANGE IT CHECK FOR :-

STOP LAMP SWITCH AND ASCD CANCEL SWITCH CLEARANCE
1. Twist and pull to remove switch.
2. Pull up on brake pedal pad and hold.
3. Insert switch into retainer until switch plunger is completely depressed.
4. Turn the switch until it locks into place in the brake pedal bracket.
NOTE:
When turning the switch to lock into place, the switch backs off the stopper to the correct clearance automatically.
5. Release the brake pedal pad.

ASK ME FOR MORE ??
WITH MY BEST WISHES

Jul 22, 2008 | 2004 Nissan Sentra

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