Originally Posted by tmasta

I did follow the instructions in the two posts, when I choose actuator has been removed it brings me to a few steps to start the bleeding process, which I am not going to do, the third step is where it fails, it asks me to pump the brake 30 times in 30 seconds then says air bleeding failed

Originally Posted by tmasta

Thanks for the document I will give that a try, it seems a lot more involved then what you posted in 98, should I go through all those steps are just the ones in your post? Which I did but I am willing to keep trying cause I’m stranded at home!!

appreciate you responding after 5 years if answering questions!!

Originally Posted by tmasta

So unfortunately i ran into the C1256 and Code C1345

i do not have a Tech stream but have a xtool d8, it seems to have all the screens everyone is discussing here.

I was planning on bleeding the brakes and followed these procedures
1) disconnect 2 connectors to brake accumulator
2) zero down
3) Disable ECB
3) then went to the Usual Air bleeding option
Before i started any actual bleeding it mentioned someone holding down the pedal so i gave up and clicked cancel without performing anything.

that's when i started getting the codes and ive tried looking at posts 61 and 98 to follow those steps but have had no luck. i had purchased a battery charger so i dont believe it has anything to do with the battery voltage.
when trying to use the actuator has been removed feature i always fail the bleeding procedure right after the "on the next screen solenoids (slrfr, slrfl, slrrr and slrrl) will be activated during the solenoid activation process, depress the brake pedal 30 times in 30 secs"

any suggestions would be greatly appreciated!

Originally Posted by hardtopte7

So I wanted to reply to this thread to document my experience with the brake bleeding on my 2008 LS460 with 82K miles. I was doing this as maintenance and to get rid of the slight "squak" noise when applying the brake. I replaced all the fluids when I bought the car and this was the latest fluid to replace. Additionally, I have an actual Snap-On / Panasonic Toyota Techstream Scantool (no ebay or Amazon cable) and the entire repair manual for an LS460 (which i downloaded from TIS).

So prior to doing this job I did a LOT of research and reviewed the manual. The manual was unusually confusing so I decided to mostly follow the DIY instructions from this forum.

The basics of the DIY were as follows:

1. Zero down accumulator
2. Disable EBD
3. Bleed front right
4. Bleed front left
4. Bleed right rear
5. Bleed left rear
6. Reset Memory
7. Relearn Linear Offset Memory

The manual listed the following for replacing only the fluid (no parts replaced)

1. Bleed front right
2. Bleed front left
3. Bleed rear
3. Disconnect accumulator connectors
4. Zero down
5. Disable EBD

Then while not listed you would presumably:

1. Reset memory
2. Relearn Linear Offset

BOTH of those procedures are wrong, especially IF you are just replacing the fluid. Here's my ordeal.

I used the Techstream to select ABS/VSC/TRAC -> Utility-> Brake Bleeding -> Adjust Fluid Only -> All Lines

I followed the prompts and everything worked fine. The fronts were bled using my pneumatic bleeder and the rears were bled using my wife and the accumulator to push the fluid. Everything was good and I just needed to reset the memory and linear offset.

This is where I screwed up

I noticed both the DIYs and manual both mentioning doing a zero down of the accumulator. So I decided I would reset the memory, zero down the accumulator, disable the EBD, and relearn the linear offset in that order.

This was mistake. The result was the accumulator pressure went to 0 (.45 V) and it was unable to build pressure as the accumulator wouldn't turn on to pressurize the system. This resulted in a low pressure code (Code C1256) which caused linear offset learning to fail (Code C1345). Also as i tried to fix the issue, my battery voltage went low causing the tests to fail. I tried bleeding everything again using the "Adjust Fluid Only" and the EBD 2.0/2.5 Utilities and no fluid would come out of the rear brakes (either side). Jumping the battery and running the car for 30 minutes would see the accumulator pressure rise to 2.19 V (minimum threshold is around 2.4) and immediately go to 0 when the brake pedal was pressed. Nothing worked and I thought I damaged the accumulator or it failed during the bleed. I googled the code and tried numerous attempts to fix, which didn't help.

I tried one last attempt at repair which worked perfect. I simply used the procedure for brake bleeding from "Actuator Replaced." I followed the prompts which leads you to this procedure:

1. Bleed front right
2. Bleed front left
3. Bleed accumulator via right rear caliper
4. Bleed rear left
5. Bleed rear right
6. Disconnect accumulator connectors
7. Zero down accumulator, shut off ignition, turn on ignition, let accumulator run until it stops (builds pressure).
8. Repeat #7 four more times (total of five)
9. Reconnect accumulator connectors.
10. Reset memory
11. Relearn Linear Offset.

During step 3 it took nearly 3 full seconds for fluid to come out which means there was a TON of air. After this, all my codes cleared and everything worked PERFECT! Keep in mind that steps 3, 4, and 5 dump a LOT of fluid very fast. Because of my screw-up I ended up replacing over 75 ounces of fluid and totally flushed the entire system. Total cost was approximately $23, a few trips to the parts store (because I ran out of fluid twice while trying to solve the problem), and the cost of my time and sanity while I thought a $1500+ part had failed.

If I had just never done a zero down after my initial bleed, everything would have been fine.

Hopefully my experience can help someone who screws up like I did.

TL;DR

Techstream is required for brake bleeding on an LS460. Use the brake bleed utility under ABS/VSC/TRAC -> Utility-> Brake Bleeding and follow the prompts for your type of bleed exactly.

If replacing fluid only go to ABS/VSC/TRAC -> Utility-> Brake Bleeding -> Adjust Fluid Only -> All Lines

If bleeding after replacing a hard part or if you screwed up, go to ABS/VSC/TRAC -> Utility-> Brake Bleeding -> Actuator Replaced

If bleeding after replacing a sensor, go to ABS/VSC/TRAC -> Utility-> Brake Bleeding -> Stroke Sensor Replaced