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Master lighting switch came on it has not done this before

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1995 class a motor home ford chassis brake light switch


The switch is located on the brake peddle where the master cylinder attaches to the peddle remove clip slide master cylinder rod to one side remove switch.

Oct 08, 2013 | Cars & Trucks

1 Answer

1974 VB Bug, brake lights are ON when car is on...stay on when breaks are applied (so virtually driving without break lights as they are always on!


If you look underneath your bug on the driver's side where the master cylinder is you will see 2 electrical plugs plugged into the master cylinder. Each plug has 3 wires. Disconnect both from the master cylinder and see if the brake lights go out. If so, then replace both brake light switches on the master cylinder. You can disconnect one at a time and see if the lights go out that way. Which ever one that causes the lights to go out when disconnected is the bad switch. The light circuit will work with only one switch connected, so if neccessary you can get by on one switch.

Sep 14, 2013 | 2000 Volkswagen Beetle

1 Answer

Does a 1987 gmcjimmy s-15 have a power window relay ot any relays at all cuz my power windows stoped working it runs a 30 amp circut breaker can the circut breaker go bad?


Anything can go bad, but to my knowledge circuit breakers seldom do. If you have a test light, pull the circuit breaker and probe both terminals for a power signal, with the key on. One terminal should show voltage with key on. If not, check the power distribution box for a blown maxi-fuse, or the wiring from that box to your fuse panel.
BTW, no, no relays are in the window circuit. So if the circuit breaker has power to it, put it back in and check for power on the driver's door master switch-one wire on the master should have voltage with key on. If no hot wire to the master switch, check inside the door openings for a broken wire. If you do have one hot wire there. check the power windows ground-the ground wire for the power windows originates at the master switch and goes back into the cabin to a nearby ground. Put one lead of the test light on the hot wire (key on), and probe the ground terminal at the master switch-if your ground is good, the test light will light up. If the ground is lost, no light. Check for a broken ground wire in the door opening, and/or find the ground and see if it is bad. If the master switch has a hot wire and a good ground wire, replace the master switch.

Apr 25, 2013 | 1987 GMC Jimmy

1 Answer

Jaguar s type 2001 driver window master control not working lights off,but windows work individually on each door


Replace or repair the bad/loose connection on the "Master" switch.
It could be severely difficult, if so take to a reputable Mechanic Shop.

Oct 15, 2012 | Cars & Trucks

1 Answer

Brake lights stay on. Were is switch.? What can I do.?


The switch is at the top of the brake pedal The problem is likely an adjustment on the switch is can be easyly done the weight of the pedal is resting on the switch look for a nut on the push rod from the master cylinder under the dash that connects the push rod from the cylinder to the acatule switch and turn it so the weight of the pedal is not resting on it anymore and you should be OK

Apr 29, 2011 | Oldsmobile Cutlass Ciera Cars & Trucks

1 Answer

How do you disconnect the brakebooster rod from the brake pedal on a 1998 4x4 z71chevy truck? how do you take the plastic conector off?? pics would help


  1. Remove the master cylinder from the brake booster. Use line wrenches and remove the brake lines on the master cylinder. Disconnect the electrical connector. Remove the nuts holding the master cylinder to the brake booster and remove the master cylinder. Lay it down with the line holes up to prevent leakage. The brake activator rod must be removed next---this is attached to the top of the brake pedal arm.
  2. There are two types of brake light switches. One is mounted remotely and has a button that is depressed by the brake pedal when it is released that creates an open circuit and turns the lights off. When the brake pedal is depressed, the button is released and allowed to extend, creating a completed circuit and turning the brake lights on. These are adjustable. All that needs to be done to adjust these switches is to adjust them where they are making contact with the arm of the brake pedal when the pedal is released. The second type is a switch that is directly attached to the brake pedal where the activator rod and pedal arm are attached with a through pin.
  3. Remove the bottom portion of the driver's side dash to gain access to the activator rod. Remove the clip or spring lock from the side of the pin holding the activator rod to the brake pedal. Disconnect the electrical connector to the brake light switch. Rotate the switch upward and dislodge the brake activator rod from the brake pedal arm. Remove the electrical switch. Using a long 3/8-inch drive extension with a swivel and a 15 mm socket, remove the four nuts under the dash on the firewall holding the brake booster to the firewall. Unplug the vacuum line to the booster and remove the vacuum booster from the firewall.
  4. Install the new booster, keeping the brake activator rod on the inboard side of the brake pedal arm. Go under the dash and install the nuts retaining the booster to the firewall and tighten. Install the brake switch over the brake pedal. Hold the electrical end up while the activator rod is pulled and inserted over the retaining pin on the brake pedal arm.
  5. Install the retaining clip on the retaining spring and connect the electrical connector to the switch. Install the lower dash panel. Install the vacuum hose to the brake booster. Install the master cylinder and tighten the nuts. Install the brake lines to the master cylinder and attach the electrical connector. Check the brake fluid level in the master cylinder and fill as necessary.
  6. Have someone sit in the car while you loosen the front brake line on the master cylinder. Have the person helping push the brake pedal to the floor and hold it there. Once the pedal is to the floor, tighten the brake line and repeat the procedure for the rear line. Recheck the level in the master cylinder and fill with brake fluid as needed.

Oct 29, 2010 | 1998 Chevrolet K1500

1 Answer

Break light on dashboard is on constantly and keeps beeping, don't know why it is on!


Check brake fluid level could be low, if not low disconnect brake light switch at master cylinder sit on side of master if light goes off replace that switch if light stay on check parking brake switch at parking brake peddle.

Jan 07, 2010 | 1994 Buick Park Avenue

3 Answers

In my sisters 2004 crown Vic headlights quit working. Have to pill up on light lever continuously and then the brights work. the problem is intermittent some times working and others not. Mechanic replaced...


had same problem. I replaced the master switch and also the turn signal indicator which also controls wipers and wiper motor,hi and low beams, window squirter, located on left side of steering column.works great now but may cost you 150 more dollars.

Oct 23, 2009 | Ford Crown Victoria Cars & Trucks

2 Answers

Ford f250 diesel . front brakes come on when driving, don't have to use brakes. changed all calipers and hoses. if i bleed the calipers then they will start to release, sometime you can hear the brake...


sounds like a bad master cylinder, next time brakes are locking up , open bleeder screw and see if that releases brake at that wheel if it does then replace master cylinder, good luck.

Oct 13, 2009 | 2002 Ford F250 Super Duty SuperCab

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