Rear Center Brake Hose

[rockola1971]

having a real PIA bleeding the suburbans brakes right now, just doing the rears now. I bled the rear passenger, went fine, there was actually almost no air at all in it. Went to the drivers rear and I cannot get air to stop coming out with the fluid, no matter what. The MC was never emptied or anything, so I don't really think that the ABS module would get air in it? What yall think? I have a buddy who's scanner I can borrow to try and cycle the ABS pump, just thinking if it's worth it.

Hopefully I didnt damage the MC

If you are getting pressure buildup at the brake pedal then you likely didnt trash the MC. Typically when someone pushes the MC seals past the long term use wear point there is no coming back from that and the MC will never build any pressure up at all.

You my friend have air trapped and will never get it out without that buddies scanner that will hopefully have the auto bleed feature of cycling the ABS pump and solenoids. Dont be surprised if you have to run the auto bleed 7-10 times because of how many lines you had to replace. Its just the nature of the beast. Once you embrace it, it gets easy and ends up with a very firm brake pedal for our generation that is known to be much less firmer than the 07+.

 

[JPVortex]

If you are getting pressure buildup at the brake pedal then you likely didnt trash the MC. Typically when someone pushes the MC seals past the long term use wear point there is no coming back from that and the MC will never build any pressure up at all.

You my friend have air trapped and will never get it out without that buddies scanner that will hopefully have the auto bleed feature of cycling the ABS pump and solenoids. Dont be surprised if you have to run the auto bleed 7-10 times because of how many lines you had to replace. Its just the nature of the beast. Once you embrace it, it gets easy and ends up with a very firm brake pedal for our generation that is known to be much less firmer than the 07+.

Thank you! Yeah the master cylinder still builds up great pressure.

Unfortunately I borrowed my friends scan tool…. And the firmware version is too old and doesn’t have the abs bleed option yet. I tried updating it but it’s bound to his account on the computer and he can’t remember the login.

So I did the right thing and went ahead and ordered the cheapest scan tool that can do an abs bleed. It’s a $115 Foxwell scanner. Should be here next week!

You think I should run the pump 10 times before I bleed them again at all? Or start with like just a few cycles, like 2 or 3?

 

[rockola1971]

Thank you! Yeah the master cylinder still builds up great pressure.

Unfortunately I borrowed my friends scan tool…. And the firmware version is too old and doesn’t have the abs bleed option yet. I tried updating it but it’s bound to his account on the computer and he can’t remember the login.

So I did the right thing and went ahead and ordered the cheapest scan tool that can do an abs bleed. It’s a $115 Foxwell scanner. Should be here next week!

You think I should run the pump 10 times before I bleed them again at all? Or start with like just a few cycles, like 2 or 3?

Im not sure what you are asking in your last sentence. It appears that you arent familiar with the auto bleed procedure. During the procedure the scan tool operates the ABS pump and cycles the specific solenoids at the PROPER TIME. All you have to do is follow the instructions on which wheel to be at and it will tell you when to crack bleeder open and then close it.

 

[JPVortex]

Im not sure what you are asking in your last sentence. It appears that you arent familiar with the auto bleed procedure. During the procedure the scan tool operates the ABS pump and cycles the specific solenoids at the PROPER TIME. All you have to do is follow the instructions on which wheel to be at and it will tell you when to crack bleeder open and then close it.

Yeah I know what you’re talking about, but that only seems to be the case on the really more expensive scanners.

On the cheaper ones with the “auto bleed” all they seem to do is run the abs pump, they don’t actually bring you through a specific procedure like the more expensive tools.

 

[OR VietVet]

Yeah I know what you’re talking about, but that only seems to be the case on the really more expensive scanners.

On the cheaper ones with the “auto bleed” all they seem to do is run the abs pump, they don’t actually bring you through a specific procedure like the more expensive tools.

What Foxwell scanner did you order?

 

[JPVortex]

What Foxwell scanner did you order?

I ordered a Foxwell NT630 Plus. Upon further investigation, seems this scanner may actually have a true abs auto bleed sequence, where it guides you through opening bleeders, and opens specific valves. Will definitely found out once it comes in though! Lol.

 

[JPVortex]

So I’m guessing before I even attempt this abs bleed I should manually bleed all 4 corners first and get as much air as possible? Obviously I’m not going to get all the air from the rear left, but I’m thinking if I get all the air I can on each side it’d make abs bleeding way easier.

 

[JPVortex]

So folks, little update, I don't think theres any air in the ABS pump and reason is, I have found a leak. But it's one of 2 possibilities.

It's leaking from where the rear center brake hose and the left hard line with a flare fitting bolt up to each other. I pump the pedal and come back and see it dripping down the metal line(not a lot, but enough to cause air bubbles!). Question is, I have no clue if it's the male hard line side thats causing the leak or the female side on the rubber hose that's causing it. It's tight aswell.... I will pull the steel line off and see how the flare looks, and go from there!

 

[JPVortex]

Think I'm going to start with the metal line, pulled the fitting off, and the flare looks slightly crooked. May be enough to cause the leak.

 

[JPVortex]

Was indeed the hard line. Replaced with a pre-flared autozone line and no leaks! Will update with bleeding results tomorrow.