2008 4Runner Parking Brake Warning Light & ABS Light Flicker Simultaneously

[sant6236]

Anyone know what causes this or have a solution? Both lights flicker simultaneously and intermittently. Occurs when the brake is applied OR if the tires brake loose. I understand the brake fluid level sensor is connected to the skid control in the ECU, so that may explain it.

I checked my reservoir and it full.

 

[riceandpho]

could be a dirty switch above the pedal.

 

[sant6236]

Above which pedal? The parking brake pedal or ABS pedal?

 

[riceandpho]

Above which pedal? The parking brake pedal or ABS pedal?

parking brake pedal.

 

[sant6236]

Aaaah ha!

 

[sant6236]

Toyota OEM Part# for the switch is 84550-04020 @ $45.11

 

[AuSeeker]

Toyota OEM Part# for the switch is 84550-04020 @ $45.11

If you haven't ordered a new switch yet, first try and get some electronic spray cleaner to pentetrate into the switch while repeatedly manualy pressing and releasing the switch which may clean whatever is causing it to make contact and lighting the brake light, removing the switch will help get more cleaner into it.

 

[sant6236]

I like your suggestion...I didn't know electronic spray cleaner was even a thing....

 

[AuSeeker]

I like your suggestion...I didn't know electronic spray cleaner was even a thing....

Yes, you should be able to find some at most autoparts stores or any computer supplies stores, there are many brands but CRC is a good one, here's a link to some at Walmart, but I don't know for sure if they stock it at the stores or just sell it online, I know this brand is sold at most all autoparts stores.

https://www.walmart.com/ip/CRC-5103...MIlpzB7u-54AIVQhppCh2vUwTdEAYYAiABEgIV6PD_BwE

 

[sant6236]

I'm Not convinced it's the parking brake switch. When I hit the main ABS brake pedal it will also flicker Intermittently. This is me pressing the ABS brake repeatedly.

 

[Burt]

Also check to make sure brake pedal is fully retracted, therefore pressing against switch.

 

[sant6236]

There is a switch on the ABS pedal too isn't there? Somehow both of these switches can trigger that particular light.

 

[sant6236]

Here is a pic of the ABS switch and where it makes contact with pedal.

 

[AuSeeker]

I don't think it would be the main brake pedal switch that is causing this, it's main purpose is to turn on the brake lights when applying the brakes, the only time pressing the main brake pedal should cause the brake warning light to come on is when there's an issue with the braking system.

 

[sant6236]

I hear u AuSeeker but how do you explain the ABS pedal triggering that light? Nearly every other time I press the pedal it will flicker.

 

[Burt]

I think there is confusion concerning the brake light indicator here. The one in picture is parking brake, simply warning that brake is engaged and would also beep if you try to move vehicle while brake engaged. Has nothing to do with ABS, that would be yellow and also trigger a few other instrument panel lights.
Focus on the parking brake, not the normal brake pedal.

 

[AuSeeker]

I hear u AuSeeker but how do you explain the ABS pedal triggering that light? Nearly every other time I press the pedal it will flicker.

I think there is confusion concerning the brake light indicator here. The one in picture is parking brake, simply warning that brake is engaged and would also beep if you try to move vehicle while brake engaged. Has nothing to do with ABS, that would be yellow and also trigger a few other instrument panel lights.
Focus on the parking brake, not the normal brake pedal.

There are 2 warning lights that relate to the braking system, the "Brake System Warning Light", which is the one we're talking about, the other is the "Anti-Lock Brake System Warning Light" A.K.A. ABS which we aren't talking about, 2 totally different systems even though the ABS uses the normal braking system via the ABS computer.

The Brake System Warning Light comes on when applying the parking brake to warn you if you attempt to drive the vehicle with the parking brake engaged, the other time it comes on is when there's an issue with hydraulic pressure in the braking system or e.g. lack of pressure meaning the master cylinder can't create pressure due to worn seal/o-rings, etc. or low on fluid usually meaning you have a fluid leak, or the sensor that detects that pressure has or is failing, which I now think maybe your issue.

 

[sant6236]

AuSeeker

Where is that sensor specifically located? The one "that detects that pressure has or is falling?"

 

[AuSeeker]

AuSeeker

Where is that sensor specifically located? The one "that detects that pressure has or is falling?"

I'm not 100% sure and I could be mistaken but I afraid it maybe intergrated in the control module which is located on the side of the master cylinder and unfortunately nothing on these master cylinders are cheap, a new control module runs around at least $1100 to $1200, I think you may need to take it in to a dealer who has the proper special service tools and let them run tests to see where the issue really is.

If you do need to replace an expensive component you might want to get a complete used or rebuilt unit off of Ebay that has at least some kind of warranty, it will still be expensive but you could most likely find a complete assembly for less than a new control module.

 

[sant6236]

AuSeeker

Are you referring to the red or blue or neither?