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-   -   How to properly bleed a 08 vue xe brake system? (http://www.saturnspot.com/showthread.php?t=32824)

2008vuexe 03-06-2013 09:17 PM

How to properly bleed a 08 vue xe brake system?
 
Wondering guys. And what type of system does it have? A delphi7? I'm wondering sincei have intermittent hard pedal leading me to believe I probably have air expanding inside with heat. I changed the master Cylinder about 8 months ago and I never had this issue until I did that swap. I did the typical RR RL FR FL procedure. Help. Is Not the booster hose or valve. I changed it. Not sticky calipers either. I did a full brake job since the pads were low all around and greased all the pins in which were in excellent shape.

2008vuexe 03-06-2013 10:33 PM

brief history, intermittently my brake pedal get a little hard and my brakes drag. All calipers are good. Pins are good and non pitted and greased.booster hose and check valve are good.brake line look good.

2008vuexe 03-06-2013 10:34 PM

Here is another hint I noticed. Brakes dragged. I open the good and unplug the booster valve. I hear a healthy vacuum hiss, immediately the car rolls back. So when the vacuum gets removed the brakes let go. Hmmm. Either the booster is the problem or I might be close in my theory of air expanding. What do you guys think?

Ssicarman 03-07-2013 01:03 AM

Why did you change the master cylinder?

Air in the hydraulic system will give a spongy pedal. Air has a hard time compressing like a fluid. Given this it is very unlikely that it will expand with heat to give you a hard pedal.

Dragging brakes mean that you have something holding hydraulic pressure on the system. If it began with the master cylinder replacement then this is where you need to start looking for your cause. I would unbolt the master and pull it back from the booster to make sure that the push rod is in place properly. If that is ok then you may have a problem in the booster.

With an intermitant problem you may have a time finding the problem.

2008vuexe 03-07-2013 01:43 AM

Quote:

Originally Posted by Ssicarman (Post 307935)
Why did you change the master cylinder?

Air in the hydraulic system will give a spongy pedal. Air has a hard time compressing like a fluid. Given this it is very unlikely that it will expand with heat to give you a hard pedal.

Dragging brakes mean that you have something holding hydraulic pressure on the system. If it began with the master cylinder replacement then this is where you need to start looking for your cause. I would unbolt the master and pull it back from the booster to make sure that the push rod is in place properly. If that is ok then you may have a problem in the booster.

With an intermitant problem you may have a time finding the problem.

AWesome! Thx for the reply. I changed the MC due to it leaking inside the booster. So I got a cardone rebuild from Oreilly. Put it in and it worked well for a while. Then about a month later, I began to get a slightly hard pedal feeling and noticed the car would drag slightly when that sensation would occur. Doesn't lock, just drags likevyour barely touching the brakes. Enough to make the car not move at idle at D. I changed the booster valve. Cheap but didn't fix it. Also, I don't loose power assist at all so it's not the booster. Sometimes. .. When it does it at stop and go traffic, I will get the hard pedal feel and I push the oedal hard like 3 pumps, and suddenly it goes back to normal. Sometimes I don't pump it at all and I feel the pedal drop slightly and is normal again. Weird. I suspect you are correct. There's pressure build up causing it. But what do you think about the booster valve trick? If it begins to drag, I pull over and leave it at neutral, unplug the booster hose check valve from the booster and as soon as I hear the vacuum hiss, the car rolls freely. What the heck!

2008vuexe 03-10-2013 08:33 AM

Well. Changed the master to a new one nota rebuild. Drag still there. But now I get a abs code c0131. Traction and anti lock pressure module. Wtf!? Is that?

2008vuexe 03-12-2013 04:35 AM

Ok... technician recommended to replace the costly abs module. Or pump.


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