slimboiphat
New member
It should be 81570-35040
thanks a bunch!
broken 3rd brake light ?
- Thread starter J-money$$$
- Start date
thanks a bunch!
Jason B
Official Vendor
Factory bulb is Koito 18 watt. Just changed my original bulb after 20 years! ANd it was deformed. This bulb being burnt out made my truck shift erratically (triggers torque converter lockup) when puttin the turn signals on in the final drive gear at highway speeds. If this bulb burns out, beware of this.
Blackdogtomo
New member
Bulb
These are great to replace the bulb, but does anyone have an idea for how to change it to something better? Maybe an LED option? Thanks!
These are great to replace the bulb, but does anyone have an idea for how to change it to something better? Maybe an LED option? Thanks!
Dom8706
New member
Bringing back this dead thread again to see if anyone has actually changed out the third brake light for a LED without any issues as I am in the process of switching to LEDs on everything. Thank you.
phattyduck
Elite Member
You just need to have load resistors in the brake light system to make sure the other systems that rely on the signal to work correctly. Put a load resistor with each brake light (on the sides) and you won't need to worry about the 3rd brake light bulb type.
It will likely be difficult to find an LED bulb that will have the right beam pattern to work exactly like the stock 921 though... (it comes into the housing at an angle, if I remember correctly)
-Charlie
Twan
Senior Member
I just replaced mine the other day with this: Amazon.com: LASFIT 921 912 W16W LED Third Brake Center High Mount Stop Light Bulbs, Red Light, Plug&Play: Automotive
Lights up plenty bright now since mine looked like the one Jason B posted above.
Dom8706
New member
Excellent. Thank you. I will be ordering this.
Dom8706
New member
I replaced the two brake lights with LEDs and havent had any issues yet. I know i need to get a relay for the blinkers to prevent hyper flashing but what would the benefit of putting load resistors on each brake light be?
phattyduck
Elite Member
The brake light circuit needs low resistance in it for the ABS system to sense the brake circuit correctly. One incandescent is enough - and since people replace the third brake light last, they blame problems on that. It isn't specifically the third brake light, all three are directly connected. You just need sufficiently low resistance in the circuit *somewhere*. I suggest doing it down by the tail lights because there is more room/access to put a load resistor there.
-Charlie
Endlessblockades
Senior Member
I just noticed my original 3rd brake light bulb is out. If I have standard bulbs in the main brake lights, I can use an LED as a 3rd without any other resistance mods, right?
phattyduck
Elite Member
Twan
Senior Member
Yes, it works fine.
Dom8706
New member
Thank you for your detailed response. Is there a specific load resistor that I need or is there a certain one you recommend?
Dom8706
New member
Cant you just use LEDs that are resistance loaded? They make these for the CAN system and vehicles that tell you a light I'd out. Those sould have resistance values in the leds bulbs themselves and may solve the issue for you.
Sent from my SM-J337V using Tapatalk
I wasn't even aware they made LEDs with built in load resistors. That definitely would of been the right route for me.
Ed_C
Senior Member
I've been running LEDs in my taillights' brake and 3rd brake light with no ABS or cruise control issues like some have had when switching to aftermarket full LED taillights, no piggybacked resistors required.
Tried a few 921 LEDs and found one that's more intense than the original incandescent bulb, used it first on my 1st-gen Tundra then decided to test it on the 4Runner. Best, Brightest LED Brake Light Bulb
Tried a few 921 LEDs and found one that's more intense than the original incandescent bulb, used it first on my 1st-gen Tundra then decided to test it on the 4Runner. Best, Brightest LED Brake Light Bulb
Waking this thread up again. I was testing all lights as of routine maintenance to find the 3rd brake light not working. It seems like mine has been burnt out for years because I have never seen it work so I decided to change the bulb. Following this forum, I put in a 921 Sylvania bulb and it fit..... but was loose and wobbly. I'm going to assume that my connector to the bulb is shot so I will go get one off a scrapped 4Runner for now and see if it works. The old and new bulb is very identical so i'm just confused.
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Ed_C
Senior Member
Yes it's a 921 bulb. You may want to try bending the socket contacts with a pick or small screwdriver to tighten up the bulb fit.
I was thinking about doing that but the plastic on mine was all burnt and melted so I headed to the nearest scrapper and scored 2 good connectors. One of them seems to have been replaced at one point which i'm very happy about and overall only paid $1. I did buy the 921 bulb and it's identical.
