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Re: Brake pedal won't return.
There could be a couple reasons for this. First thing to check is your return spring, is it still there and attached properly? Next thing to check is your master cylinder pressure release. Loosen the bleed nipple on the rear caliper. Does the brake release now? If so, your master cylinder has some debris clogging the fluid return passageway. Remove and clean it. If the brake still does not release after opening the bleed nipple, at least one of your caliper pistons is binding. Remove the rear caliper and the brake pads. Now press the pedal and force the pistons out. Looses the bleed nipple and attempt to press the pistons back into place. They should move smoothly when you apply firm pressure. Clean the caliper thoroughly. If you have a rebuild kit for the caliper this is a good time to rebuild it. After cleaning, put it back together, bleed the brakes and test again. It is normal for disk brakes to drag SLIGHTLY on the rotor, but they should not stop a free spinning wheel in less than a coupld revolutions when spun by hand.
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I suspect that your brake light switch is not being operated by the brake pedal return. When you step on the brake pedal, the switch mounted under the dash lets the plunger out operating the lights. When the brake pedal is released the pedal returns to its rest position by a spring on the brake pedal and pushes in the plunger of the light switch turning off the brake light. Charge up the battery and observe if the lights stay on at night. If so then you have to replace the switch. (about 5 bucks at parts supplier) The Air Bag light is another issue, but would not drain the battery over night. The brake lights uses a lot of amperage and would drain the battery over night.
If the brake lights stay on even if the car is turned off (or even if it is on) the first thing I would be checking is the brake pedal switch under the dash. Brake lights are activated when the brake pedal is depressed and comes off the switch or the return spring is broken or stretched not allowing it to fully return when foot is taken off the brake pedal.
Hi Anonymous, a brake light staying on is usually caused by the front brake light switch, witch is mechanical, not disengaging. On early models moving the throttle control housing closer to the front brake master cylinder is the main fix. On late models, the switch gets tweaked and needs to be realigned. A brake light that does not come on when the brake lever is applied can be caused by a faulty switch or no continuity in the wiring at the switch. The rear brake light switch is hydraulic and it is extremely rare to malfunction in a closed circuit condition causing the brake light to stay on. Usually rear brake light switch issues are caused by no brake pedal free play or a sticky rear master cylinder piston. A brake light that does not come on when the rear brake pedal is depressed can be caused by a faulty switch, air in the brake line, or no continuity in the wiring at the switch. For more information about your issue and free downloads that you will need please visit the websites below, and for specific information or questions, please feel free to contact me at firstname.lastname@example.org. Good luck and have a nice day. Thread Electronics noob Brake light doesn activate with front brakehttp://www.badweatherbikers.com/buell/messages/32777/477604.html?1314981244 Buell Service Manuals PDF Download TWIN Motorcycles Buell parts 2005 Buell Firebolt Owners Manual
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Okay, you either have a bad Master cylinder, Brake booster or Brake pedal lever problem.
Look under the dash at the top of the brake pedal lever. See if any switches are binding, check the bolt that goes through the brake pedal lever.
If all is good, then the Master cylinder and Brake booster should be looked at.
There is one other possibility that requires a bit more work. Sometimes when a brakeline, anywhere on the car, collapses internally, it acts like a flap. This prevents the fluid from returning to the Master cylinder.
You would start by jacking up each wheel, with the trans in Neutral for the rear if a rear drive, and try to turn the individual wheel. Any wheel which drags bad is still holding hydraulic brake fluid and is why the Master cylinder is not returning to a normal position. The insides of that brakeline has collapsed.
you may have a bad master cylinder that is not pushing the brake pedal to the stop when not breaking.in other words the master allows the pedal to rest lower as it doesn`t have sufficeint residual pressure to push the pedal back,or the pedal is catching on something not allowing it to return to its rest position.this can cause the rear brakes to apply slightly as the pedal not being all the way in the rest position is applying just enough pressure to the system.if the pedal is going all the way to the floor then you need to check for a fluid leak in the system including the master cylinder(internal leak)if no external leak is found.
Did you adjust the brake light switch correctly? To adjust the brake light switch, first press the brake pedal down a few inches, then pull the switch plunger rod out of the switch toward the brake pedal arm, as far as you can without using excessive force. Next, return the brake pedal to the pedal stop positionagainst the pedal stop and pull the brake pedal toward the rear to push the brake light switch actuating plunger rod into the switch housing limited by the travel of the brake pedal arm rear travel stop position. This procedure automatically adjusts the brake light switch correctly.
If the brake lights still don't turn off with the brake pedal released, check the brake pedal arm for sticking or binding that is preventing the brake pedal arm from returning fully to the pedal stop when the brake is released.
Is the problem your brake pedal is to low There is an adjustment for the brake light switch at the top of the pedal that could affect pedal hight slightly But if down a 1/2 inch or so i would suspect some kind of a problem with the brake system it self how well do the brakes stop the vehicleand have you noticed more of a drop in the pedal over time?
hiya if the rear lights are remaining on ? with no ignition it will be the brake lights staying on this is easily remendied/ checked by trypulling the brake pedal up by hand and see if lights go off ? if so then you will need to adjust the b/light switch which is positioned adjacent to pedal and can be screwed inwards towards the pedal untill the plunger on switch is pushed into the switch which puts lights off ensure pedal is fully up then adjust switch reconnect the wire/plug and press pedal slightly to ensure b/lights operate ok and then go off with pedal released ? on hyundai the brakelights do not req ignition on to operate hence more likely problem is as above good luck