Hello everyone. I've run into something of a big headache while bleeding my brakes today. I am no stranger to this process so this one really has me scratching my head.

I started bleeding in order RP, RD, FP, FD. The two rear pedals went perfectly fine. Got to the front passenger wheel and as soon as I opened the bleeder I lost nearly all pressure in the pedal. I went through nearly 60 oz's of fluid trying to flush all air out of the lines. I figured the must be air trapped in the ABS so I closed that bleeder did the FD side (same issue but no surprise). Since we just got a fresh pack of snow and I have a long driveway, I took it out to the driveway and did the brake slam to activate the ABS a few times. My thinking on that was also that since I basically ended up doing a full system flush I may as well try to eliminate the really old stuff in the ABS as well. Took it back and started the process over in the same order. Same problem happens at the same spot. I do see a constant stream of bubbles from that nipple until the flow stops. What in the world is going on at this FP side wheel?!?!?

Before it's asked, I was extremely cautious to make sure the fluid in the MC never dropped below the min line. I'm paranoid as hell about that. I've done this the old school way and gravity bleeding. Nothing changes.

2014 Tahoe LS All-Star edition

 

Always post your vehicle info please.

 

My mistake. I thought it was in my profile info but see that it's not. Posted updated to reflect.

 

Same thing on the second go around. Put everything back together and pedal goes nearly to the floor. Last ditch effort, I drove about a mile down the road to a large parking lot that hadn't been cleared of snow. I spent about 20 minutes doing Dukes of Hazard maneuvers to give the ABS a good workout and what do you know...the pedal pressure is back to where it was before I started all this. I'm guessing there was a lot of air in there. The brakes are still a little spongy and I'm tempted to do bleed all the lines again now that I've done this.

 

I think you need a diagnostic tool to reliably bleed the ABS system

 

I'm sure you're right, but for an unemployed boy $200 is a little out of budget at the moment.

 

shovel a few driveways

 

Could the master cylinder need bleeding? What led to the requirement for the brake bleeding in the first place?

 

So did you figure this out? Inquiring minds want to know.....