Brake bleeding question

[eurotic]

Last week I installed stainless steel brake lines and flushed with new RBF600 fluid. Went out last night to bed in the brakes (as I do a couple times every year) then this morning rebleed the brakes. Got a few small bubbles out on the first opening on each calliper. When I was doing the last calliper I noticed what I think are very tiny bubbles. I did the bleed 10 more times and it's always the same result. I took a video of what I'm seeing. The process I am using to bleed is have someone pump the brake pedal and hold it, the I crack the bleeder open, let out some fluid, close bleeder, repeat.

I don't remember seeing this in the others but maybe it was there and I just missed it.

I double checked all the connections and they seem tight.

Is this something I should be concerned about? Is this just from the way I pressurize the system before opening the bleeder?



Thanks,
Shawn

[milesed]

When I swapped lines, I lost almost all of my fluid so I did a total flush. I'd keep bleeding until all bubbles stop at each caliper. I needed 1 liter of fluid for the job.

Did you bleed in correct order? It should be passenger rear, driver rear, passenger front, driver front.
Did you double check each end of the new lines are tight?

[beans912]

Could be air getting into the hose were it's attached to the bleeder. If the pedal feels fine, I wouldn't worry about it.

[eurotic]

When I swapped lines, I lost almost all of my fluid so I did a total flush. I'd keep bleeding until all bubbles stop at each caliper. I needed 1 liter of fluid for the job.

Did you bleed in correct order? It should be passenger rear, driver rear, passenger front, driver front.
Did you double check each end of the new lines are tight?

Yeah followed that order. I actually went a little overboard on the bleeding and used 2 liters fluid...I wanted to make sure I got everything out. I think I will try not pressurizing first. I'll just open the bleeder, have someone press the brake down, close the bleeder. If there is still air I'll just keep going.

Could be air getting into the hose were it's attached to the bleeder. If the pedal feels fine, I wouldn't worry about it.

This is what I thought too and the reason I stopped using a vacuum bleeder as it was pulling air either through the threads of the bleeder nipple or the seal was not perfect between the hose and bleeder. So It looked like tonnes of air in the system.

But here's the thing, the brakes don't have that very grabby feel they used to (OEM pads). But the job got a little messy so I thought maybe the rotor or pad surfaces got contaminated and therefore the reason I did the bedding session. Perhaps I should do it again, and then bleed again too.

That said, last year we did just a fluid change with my brother's S4, nothing else, and he reported the different pedal feel too. Also using RBF600. I don't think I have diminished braking capacity and the pedal doesn't feel spongy, there just isn't as much initial bite.


Shawn

[BlownOne]

I went through 5-6 bottles of fluid a few years ago doing my brakes with my power bleeder because the little bubbles wouldn't stop. I finally called the company and was reminded the bleeder hose needs to have an arch from the nipple to the catch can. As soon as I did that, no more bubbles.

[chaos2984]

Could be air getting into the hose were it's attached to the bleeder. If the pedal feels fine, I wouldn't worry about it.

This exactly and to add, if you driven it and the brakes work correctly and don't pull to one side. Your good

[eurotic]

This exactly and to add, if you driven it and the brakes work correctly and don't pull to one side. Your good

Definitely the car does not pull to one side at all. I autocrossed the car yesterday with no issues. Still don't have the grabbiness that was normal prior to the fluid and line change but I can't say that it is a bad thing. In fact is might be better, a quick stab at the brakes is not as unsettling. I'm going to do another bedding session sometime this week and see how it goes but I think things are okay.