Any issues vacuum bleeding brakes?

[Toni]

Upgraded to a "bigger brake kit" aka 2nd gen calipers all around and realized that my old rears had the 7mm bleeder so I can't swap over my speed bleeders. I'd like to get the install finished up tonight so I'm wondering if I can use a mittyvac style vacuum pump to bleed the system? Do I maintain the same order as stated in the manual (PR, DF, DR, PF) ? Should the car be on?

Thanks
Antoni

[B-Man]

I've never liked using them. They suck too much air through the threads of the bleeder and don't flush out the system. BUT I've heard people having more success than my by greasing the fitting so your bleeder line seals better.

[Toni]

Oh, well all the directions I've seen list using a thread sealant. Even speedbleeders have it. So if that's the only issue then I am cool. I am just worried about the design of our system if it even works at all.

[sergechronos]

Another way to do it yourself is to run a hose off of the bleeder into a half filled bottle/cup/whatever of brake fluid. When you press the brake the air still gets pushed out, however the system sucks brake fluid back in when you let off. Keeps the fluid in the lines. I've bled many a car like that by myself.

[DrGonzo]

I always used sergechronos method. My brake Vac kit always pulled in air so I just used the cup assembly that came with it. Works great!

[Toni]

So if the threads leak, won't you have the same problem as you lift the pedal? So air will come in through the threads instead of being pulled up from the fluid jar?

I called another parts store that could get me speed bleeders tomorrow morning so I decided just to wait another day. That way I have speed bleeders on all four and can bleed pretty much anywhere if I run into issues later on.

[J. Fast]

Another way to do it yourself is to run a hose off of the bleeder into a half filled bottle/cup/whatever of brake fluid. When you press the brake the air still gets pushed out, however the system sucks brake fluid back in when you let off. Keeps the fluid in the lines. I've bled many a car like that by myself.

I use same method!

[mb3000]

I tried the speed bleeders and they leaked, so I just set them aside. Never thought about using thread sealant on something like that.

[CoopKill]

yeah +1 on the sealant. I used the mini vac on my clutch, and it pulled air through the threads. I will try the sealant on the brakes this time. What to use as a sealant? I have leftover stuff from the meth kit which I think is just rubber cement, lol.

[Toni]

You will want something that is compatible with brake fluid in case it does get sucked in. I imagine something synthetic and won't absorb moisture. Speed bleeder sells whatever they use which is good for those who change their fluid often. I imagine you could use synthetic brake grease but I'm not sure how long it would last.

Sealant

Speed Bleeder Thread Sealant | eBay