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Sounds like the brake switch is not the problem, On the pedal there is a rubber pad that contacts the switch when you release the pedal. That rubber bumper gets old and falls out. You just need to replace it with anything will fit in the hole on the pedal so it turns the brake lights off
Yes, that normally does mean air in the system. It sounds like you need a good brake system overhaul, at least new rubbers at each wheel caliper and in the master cylinder. If there has also been water in the system for a while, you may find there is enough corrosion to require replacements instead of overhaul.
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Did you get a good bleed with fluid coming out at all four wheels? If they bled good, and the pedal still goes to the floor, you need to check the brake master cylinder-it is probably shot with an internal leak. An internal leak will not let fluid pressure build up, so no brakes.
Did you keep the brake fluid reservoir from going dry while bleeding? If it went real low, air might have got back into the lines.
It is not uncommon when bleeding brakes on an older vehicle for the master cylinder to suddenly develop an internal leak and require replacement . Here's why: pushing the pedal all the way to the floor causes the master's piston to push in farther than ever before. The rubber cups then travel over a section of the cylinder not usually touched by the cups-old fluid can develop a crud there and when the piston pushes over it, the cups can get ruined. To avoid this when bleeding brakes, put a short piece of 2X4 wood block under the pedal. Then the pedal will not extend the master's piston beyond it's normal travel. Of course on a new master cylinder, you do not have to do this. A new master cylinder does require bench bleeding before installing, however, to ensure no air pockets develop from there.
Climb under the dash and look on the back of the brake pedal, brakelight switch will be on the back of the brake pedal arm halfway up the arm.
Look around in the floorboard and look for some fragments of rubber. If you see some fragments of rubber then the little piece of rubber that is attached to the back of the brake arm has probably fallen off. If the rubber piece breaks and falls off then the brakelight switch will stay on because it will be touching bare metal and grounding the switch making it stay on all the time.
And that seems to make sense because when you pulled back on the pedal the brakelights went off. Because you pulled the pedal back until it was not making contact with the switch anymore.
And the tach problem is unrelated. And im not sure about whats wrong with the tachometer. But I would suspect the vehicle speed sensor is faulty.
there is a small rubber bumper that pushes on the switch. you may need to go to the dealer or a parts store and they may have something that will work, the dealer having one in stock may be a remote possibility.
The brake switch is always located on the upper end of the brake pedal or screw linkage behind the pedal shaft in American made autos. You need to move the driver's seat full aft for room to be able to lay down facing up with a flashlight to see it. It is the very small switch that the brake pedal itself rests against, almost before the pedal linkage goes out the passenger compartment to the engine area.
Check behind your brake pedal. I don't remember what the parts were called but the same thing happened to me. When you put your foot on the brake there is a plastic or rubber circle attached to the brake pedal that comes in contact with a switch. It causes the brake lights to come on. When you take your foot off the brake it turns the switch off and the brake light goes off. Over time this rubber or plastic circle gets worn and it is still in contact with the switch so it remains on. When this first happened to me I was able to adjust the switch so that the pad came completely away from the switch when I took my foot off the brake. The second time it happened I had to replace the pad on the pedal. I actually made my own because it looked like it was part of the pedal. I also had to replace the switch another time. The switch cost under $20.00 from a parts store.
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