Bubbles In Brake Fluid?

[ryonker]

I just replaced my brake lines with the Goodrich ones from Z1 and everything seemed to go fine.

But as I bleed the brakes, it seems like I can't get rid of the bubbles. I did put some teflon tape on the bleeders. But no matter how much fluid I push through, I seem to still get small bubbles.

The brake lever feels VERY firm and I have no leaks anywhere. I am bleeding the brakes with a mity vac.

Any thoughts/ideas?

Thanks!

Rick

[Colin Green]

I just replaced my brake lines with the Goodrich ones from Z1 and everything seemed to go fine.

But as I bleed the brakes, it seems like I can't get rid of the bubbles. I did put some teflon tape on the bleeders. But no matter how much fluid I push through, I seem to still get small bubbles.

The brake lever feels VERY firm and I have no leaks anywhere. I am bleeding the brakes with a mity vac.

Any thoughts/ideas?

Thanks!

Rick

I have suffered this problem... took 3 litres before the bubbles stopped.

you could try....

1. While you have a caliper bleed nipple cracked, remove the MC lever and push the piston all the way in to remove any little bit of air that lesser piston travel fails to clear.

2. Crack the banjos at the MC while applying pressure to the lever to clear any air trapped at that junction.. repeat at the 2 into 1 union if applicable.

3. Keep pumping the fluid through till the bubbles stop for 10 full lever pumps on each caliper.

Good luck

[Nessism]

Sounds like the mity vac is pulling air from somewhere but the system is clear. I'd call the job done if the lever is "very firm" as you say.

[bwringer]

Sounds like the mity vac is pulling air from somewhere but the system is clear. I'd call the job done if the lever is "very firm" as you say.

Agreed. It's probably still pulling in air around the threads.

A symptom of air in the system is if you can "pump up" the brakes -- by rapidly squeezing three or four times, does lever travel decrease? If not, you're good to go.

[trippivot]

if the lever is solid and firm the bubbles are coming from your bleeder nipple and tube outside the closed system.

[ryonker]

When I pump the lever, it moves around 1/4 of the way back and feels tight and solid. When I pump it sort of feels a bit firmer but I am not sure. I could be just imagining it because it isn't that much .

It also just seems to be one caliper/nipple that leaks the most bubbles. The other sides was clear of bubbles.

So no worries ?

Thanks guys!!!!!!!!!!