ABS Light/VSC TRAC/VSC OFF/ BRAKE

[hortandr]

Every now and then I start my car or I am driving and my ABS Light/VSC TRAC/VSC OFF/ BRAKE lights come on my dash.
The brakes operate completely fine, no noticeable difference. I usually don't notice because until recently I had check engine and about every light on my dash.

Typically, like this morning. I just turned the car off at a red light and when I turned it back on it all lights were gone.
It seems like nothing changes when these lights come on but because it is brake related it is concerning.

Anyone ever have this?
Can I get into the ABS module through tech stream?

 

[leveeguy]

Thread 'Fix for ABS, VSC TRAC, VSC OFF, & Brake lights remain on no CEL, or how to repair an ECU'

Feb 2, 2019

Hopefully this post saves you some money by showing you how to potentially repair your skid control ECU rather than replacing/buying a new/used one (skid control ECU part #89540-60160).
These instructions do require the ability to solder surface mount components and use either an oscilloscope and/or ohm meter. I recommend a hot air solder rework station like this one for $58. There are lower cost ones than this. Although I don't recommend it, if you can't get that, then make sure to use the smallest solder iron tips you have as to not apply too much heat. Too much heat will...

• FJRyder
• abs problems traction control vsc off
• Replies: 177
• Forum: 100-Series Cruisers

• 
• 

 

[2001LC]

ABS lights on, no CEL. If mostly happening, just after first start of day. More so on cold mornings. Points to, brake fluid pressure issue.

First, rule-out low fluid level. Make sure to: Read what is embossed on the brake fluid reservoir, on how to set/check level.

Fluid okay:

Next, on cold morning before first start or more than one press of brake pedal of the day. Insert IG key, turn to ON (don't start), with hood open. Watch front of reservoir and listen to brake master booster pump motor. All seem normal. Once brake booster motor stops running. Pump brake pedal rapidly. Count how many pumps until ABS alarm and dash lights. The more pumps the better, indicating building and holding pressure well. Only a few pumps until alarms, is a sign of pressure issue.

When seals inside brake master and calipers are cold, as when any cold seal points. They don't seal well cold. With use, they heat up and expand, making a better seal. We'll typically see these cold seal brake alarms. Worsen with time and use, especially during cold weather.

Some of these are leaks between master and ABS unit (black box on master). Often, if we look close within minutes of alarms. We see wetness on bottom of master. Some even signs of leaks below brake master on inner fender
Some are seal(s) inside master. Which is internal leak. So no leaks can be found.
Some are weak or bad booster motor and or accumulator.
Some, low voltage.

There are other issues, not fluid pressure related. Like wheel speed sensors, zero point calibration or the very rare CPU or other sensor issue(s). But they have little to do with cold.

Thread 'Brakes ...... Overdue write-up.'

Nov 1, 2020

First and foremost: Brakes should only be worked by those, with high level of mechanical abilities and experienced with brake systems.

With the age of all 100 series today, in our aging fleet. Any issue, with brake master assembly. IMHO, best and safest course of action. Have the whole brake master assembly, replaced with new. If you have to ask question, on "how to", your not qualified to work on the master.

My hope is below link will give better understanding as to what we can do to reduce brake failure and what to watch for. The info is from my experiences and my thinking, as to what...

• 2001LC
• Replies: 189
• Forum: 100-Series Cruisers

• 
•