Question about 2001 Yamaha YZF-R1

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Rear brake light wont work when bake break is pushed only when front is pushed it works

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Examine the rear brake pedal and linkage....there should be a light spring that pulls on the brake switch when you push the pedal down...possibly the spring broke and fell off.
If all is well...there should be a connector nearby for the switch...usually 2 wires....12 V power in on one, and power out to brake light on the other. With a multimeter, unhook connector and with key on...you should have 12 V on one of the two wires in the harness...if you don't...there is a harness issue.
If you have power to the switch, now test for continuity (ohms) across the unhooked switch wires ...should be open (no continuity ) with pedal up, and when you press down pedal...the switch should close and show very low ohms continuity. If you cannot get continuity...normally there is an adjustment to move3 the switch out further so the spring from the pedal pulls on the switch plunger more...if your are unable to get continuity by adjusting switch mount..replace switch..

Posted on Mar 22, 2011

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1994 fatboy brake light staying on


Hi Anonymous, your front brake lite switch button is probably not getting pushed back into the off position. Remove your right handelbar switch housing and push the plastic button in and out with your finger to see if the light goes off and on. If not disconnect the wires to your rear brake lite switch and check the front switch button again. If the button works then reinstall the switch housing and push it towards the master cylinder hard and hold it with one hand and retighten the screws with the other. If you hook up rear brake lite switch wires and the brake lite comes on replace the switch. For a wiring diagram for your turn signals go to: http://officialharleyparts.com/wiring_diagrams.php Good luck

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This is in reference to my 2005 Dodge Neon. My brake light is on and the break petal pushes really easy (almost to the floor) before it grabs; however it only feels like the from brakes are grabing,...


When the rear brakes were done, the entire brake
system should have been flushed. Do that
now

You flush the system every 2 years

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Check the bulb first. There are two filaments in the bulb, one for the brake light and one for the tail light. If the bulb is good, there are two switches that turn the brake light on. One is on the front brake lever and the other is a pressure switch in the metal brake line from the rear master cylinder. Work with the rear brake light switch first.

Find and follow the metal brake line coming from the rear brake master cylinder running back towards the rear brake. Underneath the bike's transmission, you'll find a tee fitting with a pressure switch in it. With the ignition switch turned on, one of the wires that are plugged onto the switch should have battery voltage on it. When you depress the rear brake pedal, both wires should have voltage on them. If not, replace the switch.

Once you get the rear brake light switch working, if the front brake light switch does not work, it must be replaced. To replace that switch, remove the two bolts that hold the right handlebar switch housing halves together. Loosen the throttle cable and idle cable adjustments. Lift the top switch housing half and remove the throttle sleeve. The front brake light switch is the small switch right in the front of the housing half. You must desolder the wires, replace the switch with a new one, and resolder the original wires to the new switch. Reassemble the throttle sleeve and switch housing halves. Adjust the throttle cable and idle cable. Check throttle for proper operation.

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Why wont my brake light work when I push the rear brake but will when I push the front brake? I checked the switch with an ohm meter and switch is open without pushing pedal and when pedal is pushed it...


Oh yeah, I've run into this before. The ohm meter says the rear brake switch is good but the light says different because it won't light. The switch is indeed bad. What happens is the switch says it's good when checked with the ohm meter because the meter is designed not load the circuit being tested. The light on the other hand, puts a load on the switch and the resistance of the switch will not allow enough current to pass through. Replace the rear brake switch and your light will probably work.

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1 Answer

When i press on the rear break, the break light does not come on. break light will come on with the front brake engaged. have checked the bulbs.


The rear brake has a pressure switch that turns the rear brake light on and off. If it's working correctly with the front brake, this switch is the first place I'd go to. Make sure the wires a firmly plugged onto it.

You can find the switch by following the metal line that comes out of the rear of the rear brake mastercylinder. It'll have two wires connected to it.

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Have you tried powering the brak circuit itself at bulb. If it comes on then you need to find broken wire between light and switches. Since neither work if you can trace to where they meet break should be behind that.

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you need to hold in the metering valve.when you bleed the front brakes.long as the valve closed off you wont be able to bleed front brakes.better to get extra help.hard to bleed by your self .

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