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Old 08-24-2021, 12:06 AM #16
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Do you have abs? Could be a huge air bubble made it to the unit too.
You may have to cycle the pump, bleed, cycle, bleed, a couple of times to get all the air out of it.
Braking on a slick road will cycle the pump. Ex: dirt road, water soaked road.
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Old 08-24-2021, 11:31 AM #17
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Why not use one of those that have a hand pump vacuum on them from the bleeders? That way you can pull a vacuum on each of the bleeders and basically suck the air out of your brake system.

Might even be able to borrow on of those from the auto parts store.

I did this on a 1998 which I believe has the same master cylinder as the 1999
and i bleed with the engine running so everything had power. Granted I didn't let the system loose its fluid prime but I figured the abs and vacuum assist from the master cylinder would be good start.. :-)
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Old 08-24-2021, 01:17 PM #18
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Quote:
Originally Posted by Chris_Overland View Post
I did not have the engine running. I have a 1999 so as far as I'm aware the engine does not need to be running. The key was on though. For sure seems like I have lots of air in the lines, I did not cap off the lines and it sat overnight, but the reservoir was never empty.
Half your reservoir got empty, and you likely pushed some air into the ABS actuator. Lesson learned about always capping the lines, eh?

Even in the earlier 4Runners, it sometimes helps having the engine on to help the bleed process, though that isn't guaranteed to help and shouldn't be required.

-Charlie
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Old 08-24-2021, 02:37 PM #19
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Quote:
Originally Posted by HiLife View Post
Do you have abs? Could be a huge air bubble made it to the unit too.
You may have to cycle the pump, bleed, cycle, bleed, a couple of times to get all the air out of it.
Braking on a slick road will cycle the pump. Ex: dirt road, water soaked road.
you beat me to it.....my last tbu that is what i had to do. but you dont have to be going fast....just stomp on the brakes a few times so they lock up like said above...on a gravel or wet road...then bleed again.

then of course adjust back brakes....if cams or cable not frozen it might take a lot of pulls on the ebrake to get it to the recomended 7 or so clicks.
if the cams are frozen....you can go through the reqr brake drum with a screwdriver. ive been lucky and no frozen/rusted cams.

unfurtunatey for me...i will be doing this all soon....as I have a bad rear wheel cylinder....so replacing both and the shoes. and while at it im replaceing all hoses with ss lines....hey they are 20+ years old...they do go bad and can look perfect from outside....but I had one car where the line was bad,,,,swelled to the inside,,,so you could not see it, just could not figurre out why that caliper was so hard to bleed....pulled the line at the caliper...pushed the pedal...was like a blocked artery.....not much flow.
for me....anyone doing a tbu with these old rigs should at least replace the front lines if not all. new lines,,,does not have to be the ss braided....but with the money your already blowing on a tbu...why not do the best lines.
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Old 08-31-2021, 09:32 AM #20
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Quote:
Originally Posted by HiLife View Post
Do you have abs? Could be a huge air bubble made it to the unit too.
You may have to cycle the pump, bleed, cycle, bleed, a couple of times to get all the air out of it.
Braking on a slick road will cycle the pump. Ex: dirt road, water soaked road.
Quote:
Originally Posted by phattyduck View Post
Half your reservoir got empty, and you likely pushed some air into the ABS actuator. Lesson learned about always capping the lines, eh?

Even in the earlier 4Runners, it sometimes helps having the engine on to help the bleed process, though that isn't guaranteed to help and shouldn't be required.

-Charlie
Yeah, I had major air in the lines, had to take it to the shop for them to bleed the master cyl as well. Brakes still felt spongy so I cycled the abs a bunch on a gravel road and bleed them myself again at home. WAY better now!
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Old 09-01-2021, 05:12 PM #21
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Quote:
Originally Posted by HiLife View Post
Do you have abs? Could be a huge air bubble made it to the unit too.
You may have to cycle the pump, bleed, cycle, bleed, a couple of times to get all the air out of it.
Braking on a slick road will cycle the pump. Ex: dirt road, water soaked road.
That's a really great idea. I wonder if that's why so many people complain of a mushy pedal after doing the TBU. I was super careful and only a few drops ever came out of the lines when I was doing mine and never had an issue. Didn't think about the air being stuck in the ABS pump for others an how hard it would be to get it out.
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Old 09-01-2021, 05:33 PM #22
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That's a really great idea. I wonder if that's why so many people complain of a mushy pedal after doing the TBU. I was super careful and only a few drops ever came out of the lines when I was doing mine and never had an issue. Didn't think about the air being stuck in the ABS pump for others an how hard it would be to get it out.
Each member work on their differently. And the newer ones new to wrenching, are just starting out. I applaud them on learning how to wrench on their rigs.

Some find no issue is letting the whole brake circuit bleed out thinking "I'll just bleed it and it will be good". And that's fine if you know how to untrap the air out of the circuit. The newer wrenchers may not know how as they are just starting out.

The correct way is to trigger the abs motor via computer while bleeding. Not many has that kind of tool. Almost everyone knows of a dirt road near by.
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