Brake question

[iamdub]

This is really crazy, nutty. I did bleed my brakes this morning for four hours. Three times for i still had some air in lines. i activated the ignition to purge the abs module many times for each wheel manifold. and pumped for four hours. Did a test ride and I think they are worse than when i started. Thank you GMC for making our life tougher with less money.
Going to local auto repair next week. cant afford a $ 534.00 scan tool.

Why did you bleed them, did you replace parts?

 

[crabbman]

Why did you bleed them, did you replace parts?

Rotars and pads all around. I do not have the sticky pad problems alot do. Hey!

 

[iamdub]

Rotars and pads all around. I do not have the sticky pad problems alot do. Hey!

While bleeding, did you push the brake pedal all the way to the floor every time?

 

[crabbman]

While bleeding, did you push the brake pedal all the way to the floor every time?

No sir I did not. Just slow movements towards a hard stop and repeat. I do not know if I did the turn the key to on which turns on the ABS module, and I pumped a few times ,then turned off key was done right for every wheel.?
Thank you for help. This was my second four hour try to bleed brakes so that the brakes work the way they are supposed to work and I have good pedal while working the brakes.

 

[iamdub]

No sir I did not. Just slow movements towards a hard stop and repeat. I do not know if I did the turn the key to on which turns on the ABS module, and I pumped a few times ,then turned off key was done right for every wheel.?
Thank you for help. This was my second four hour try to bleed brakes so that the brakes work the way they are supposed to work and I have good pedal while working the brakes.

I learned about a year ago that pushing the pedal all the way can kill the master cylinder. I had to replace mine to finish a simple pad, rotor and fluid replacement because bottoming it out tore the seal inside the MC.

For the ABS bleeding trick, you turn the key on just as you begin to push the pedal slowly. You want the pedal stroke to take about 3 seconds to go from not pushed to whatever point you're stopping it at. I learned a simple solution is to lay a 2x4 behind the brake pedal so you have a set and safe stopping point. Doing the key-on trick 3-4 times per corner should be plenty sufficient to get the air out of the ABS solenoids. But it's all pointless if you're constantly just introducing more air into the system ahead of the ABS module (through the MC or leaking lines).

I flushed my entire system to replace all the fluid by pumping it out the back two calipers. The whole process took maybe 30 minutes doing it by myself and I wasn't in the least bit of a hurry. If you're still having a soft pedal even after just one hour of multiple bleedings, then something is definitely wrong. Could be a leaking bleeder screw or damaged MC since you didn't replace any parts that required opening up the system. A damaged bleeder screw is highly unlikely.

If you bled them properly in the correct order and are not losing any fluid, then I'm betting your MC crapped out. Even though you may not have floored the pedal, you still repeatedly pushed it beyond the stroke in which it's been traveling for so many years during normal driving.

 

[crabbman]

I learned about a year ago that pushing the pedal all the way can kill the master cylinder. I had to replace mine to finish a simple pad, rotor and fluid replacement because bottoming it out tore the seal inside the MC.

For the ABS bleeding trick, you turn the key on just as you begin to push the pedal slowly. You want the pedal stroke to take about 3 seconds to go from not pushed to whatever point you're stopping it at. I learned a simple solution is to lay a 2x4 behind the brake pedal so you have a set and safe stopping point. Doing the key-on trick 3-4 times per corner should be plenty sufficient to get the air out of the ABS solenoids. But it's all pointless if you're constantly just introducing more air into the system ahead of the ABS module (through the MC or leaking lines).

I flushed my entire system to replace all the fluid by pumping it out the back two calipers. The whole process took maybe 30 minutes doing it by myself and I wasn't in the least bit of a hurry. If you're still having a soft pedal even after just one hour of multiple bleedings, then something is definitely wrong. Could be a leaking bleeder screw or damaged MC since you didn't replace any parts that required opening up the system. A damaged bleeder screw is highly unlikely.

If you bled them properly in the correct order and are not losing any fluid, then I'm betting your MC crapped out. Even though you may not have floored the pedal, you still repeatedly pushed it beyond the stroke in which it's been traveling for so many years during normal driving.

Thank you. I was also using a clear tubing to watch for bubbles and I think the connection to bleeder valve was not real tight. I did put a metal screw on holder and that also was not really working for I really never got rid of all bubbles. I was thinking brake line tubing that I have would really give me a good fit, but now I cannot see bubbles in line.

 

[HiHoeSilver]

Thank you. I was also using a clear tubing to watch for bubbles and I think the connection to bleeder valve was not real tight. I did put a metal screw on holder and that also was not really working for I really never got rid of all bubbles. I was thinking brake line tubing that I have would really give me a good fit, but now I cannot see bubbles in line.

Yeah, clear hose is certainly helpful, but a tight fit at the bleeder is more important and as long as the bottle you've got it in is clear, you'll know whether or not you're still getting air.

 

[crabbman]

Yeah, clear hose is certainly helpful, but a tight fit at the bleeder is more important and as long as the bottle you've got it in is clear, you'll know whether or not you're still getting air.

Excellent answer. I will do this one more try next friday. Will do a 2x4, a new bleeded master cylinder, bleed all brakes, maybe a metal screw band,turn on ignition to reset abs module.I think that is it., still alot just to have a car brakes working the right way.
THANK YOU. Much better than paying a repair shop several hundred dollars.
Good night.

 

[crabbman]

Excellent answer. I will do this one more try next friday. Will do a 2x4, a new bleeded master cylinder, bleed all brakes, maybe a metal screw band,turn on ignition to reset abs module.I think that is it., still alot just to have a car brakes working the right way.
THANK YOU. Much better than paying a repair shop several hundred dollars.
Good night.

Well I Spent three hours doing this procedure with a new bench bleed master cylinder.
Still no luck. This time really felt special to me everything was great until I did a road rest. Failure!
Ugh!

 

[HiHoeSilver]

Well I Spent three hours doing this procedure with a new bench bleed master cylinder.
Still no luck. This time really felt special to me everything was great until I did a road rest. Failure!
Ugh!

Did you try getting the abs to activate some grass or gravel during your test drive?