Hello forum,
I recently took my front 2 calipers off to paint them( 07 lsj).

2 days later I put them on, bleed them, hand vac bleed them and i still have no pressure in the brake pedal. I been at this for a few day. Any help?

 

Anythnig coming out when you try and bleed them? Reservoir filled?

 

Yes main stream of fluid comes out strong, seems to have no air

Reservoir is filled

 

Try bleeding the backs

 

You did properly bleed every brake right, I forget the order I believe it's passengers back then front then drivers back then front.

 

Did all in right order. When cars off the pedal gets hard, right when start up it has nothing

 

Bump

 

Just to verify you are bleeding in this order
LR
RF
RR
LF
Also mabe some can cone in and verify this but I believe it is possible to damage the master cylinder by overstroking it caused by low fluid or rapid pumping or something

 

No. Read the how-to.

https://www.cobaltss.net/forums/how-...-brakes-59164/

I wouldn't bother bleeding the rears if you didn't disconnect them.

 

I have bled it every way possible even the correct order even with the rears

Fluid comes out with a nice flow. Once I start the car and has zero breaks

I have hurt I may need a scan tool to bleed the ABS module.

Has anyone heard of this or did this?

Didn't think taking my calipers off would run into a pain in ass like this

 

My bad for some reason I always get confused with right and left if your looking at the car or sitting in it
Your right its
Rr
Lf
Lr
Rf

 

Good luck bleeding the ABS module. My system ran dry a few years back. The only people I could find to open the ABS ports is chevy. My buddy manages an Exon and even he tells me that he doesn't have the tools to open the ports. If those lines are dry you would still have good brake pressure. My brakes are very responsive still. Just a bit mushy for the first bit, then perfectly fine.

 

Air can get into the abs module it requires tech2 or equivalent to cycle the module

 

Ya, its a bitch, but it wouldn't cause a complete lack of pressure. Just a mushy feeling

 

Wonder what could be my cause

I had them off for two days and put them back on, filled this master cylinder all the way to the top and try to bleed them.

 

Damage to the seals can occur in the master cylinder if there is low fluid in the system
Piston strokes further than usual due to low fluid then picks up trash or sediments and ruins seals

 

If I understand correctly, you should still be able to bleed them correctly but the ABS unit is still going to have old fluid in it, and that shouldn't matter in this case since you're just bleeding them to make the car safe to drive. I use a pressure bleeder and it works perfectly even though the ABS never cycles.

If you're trying to get out every last drop of old fluid, then yes, you'd need the tool to cycle the ABS. Or you could do like some people do - find a wet or icy road and slam on the brakes a few times. Then bleed the whole system again.

Or not worry about it. I'll bet if you went to Midas or some place like that they wouldn't bleed the ABS.

Say, is it possible you have the calipers on the wrong sides? Bleeders would be on the bottom if they're on the wrong side.

 

Man im a retard

Left was on the right side and vis versa

Thankscss9450

 

Wow good call

 

How do u possibly put the calipers on the wrong sides lmao ... Smh

 

Glad it worked out in the end!

 

I'm not sure how I did that LOL. The only difference was the nipple was on the bottom

Everything else looks exactly the same

Or I was tired LOL just got done putting the engine in fully built with the TVs