Brake Booster - How do you bleed a freshly installed one

[Trls250s]

If you look at the brake booster and the plastic line on top going to the end of the cylinder, i currently have a bubble stuck in mine.

The brake booster has been upgraded to a larger diameter one for more response etc.

We have tried everything we can think of but cant get the sucker out.

suggestions?

We tried for an hour, a number of different techniques. It is the last thing to get my car on the road. The engines in, the cars tuned, the manual conversion is complete, i just want to go fry some tires!

[thegreatestben]

I just borrowed a compressor powered bleeder and it made a tedious job into one that you just watch. See if you can find one to borrow

[matt dunn]

that's on the resovoir side of the cylinder?


It wont affect the brakes at all uless it gets sucked in,

and if you cant get it in with an hours trying it probably never will.

[Trls250s]

The booster just wont pump up though.

You pump and pump on the pedal and it never goes hard (lol).

Any other suggestions to what that problem could be then?

It really feels like air in the booster, if you push the pedal fast you get resistance, and then a couple of cm of no resistance and then resistance again. Feels like the piston passing throug a pocket. But if you push slowly you dont feel anything at all.

[Trls250s]

The air bubble has gone over night. checked it just now.

It seems as though the system is leaking air back into the master cylinder somewhere.

Are you ment to treat the threads with anything special? Or just do them up super tight?

[metric]

get someone to block push the pedal in and hold it then block the end and get them to let the pedal out

[Trls250s]

Heres a more detailed description of whats happening:

Whats happanening is im pumping the pedal and i can hear the cylinder sucking air in. Small air bubbles come up through the resiviour like opening a bottle of coke.

I have cleaned the cylinder all up and nowhere appears to be leaking. But im sure ill see when i get home ill be able to see.

I can pump a lot and the fluid level doesnt go down either. We bleed the brakes themselves and no air bubbles are in them as the master was only thing that was replaced.

It did a funny thing before as well when i first filled it, the pedal would only go down half way and then lock as if it had hit something mechanical. We let pressure out of the tap in the side of tyhe master cylidner and it came right, but now it just keeps pumping for ever.

I really hope i dont need to rebuild the master cylinder as this is time consuming and i just want to go do some skids. It it keeps being annoying like it is ill refit the AE85 one and get the booster/master looked at.

[Trls250s]

This has been fixed.

Brake master was leaking where it connects to the booster. The whole unit has been replaced