SpeedBleeder question

[jazzamoto]

Is it possible to reverse flush a brake system equipped with SpeedBleeders or will the ball valve in the bleeder prevent it?

[canuguzzi]

They are supposed to work in one direction only, pressure pushes the fluid out. The good ones. The cheapos can work both ways.

If you want to reverse flush, drain the fluid then just flush it with hoses and a fluid pump.

[canuguzzi]

Just loosen them and you can force fluid back through. The really good ones have built in check valves and are one way.

[jazzamoto]

Just loosen them and you can force fluid back through. The really good ones have built in check valves and are one way.

I've installed Speed Bleeders from Speed Bleeder Products, Inc. which have a built-in check valve and which, I assume, are the good ones and are one way. So you think I can just loosen them and force fluid back through?
I've got a large syringe with a hose attached that I can use (done it before with stock bleeders) but I wanted to avoid pissing fluid out if I can help it.   Thanks!

[canuguzzi]

No, if they have a check valve you can't just loosen them, the fluid will get forced past the threads and you'll have a mess.

Is there a reason you want to back flush? Is there some nasty stuff in there you can get out by bleeding them?

[jazzamoto]

No, if they have a check valve you can't just loosen them, the fluid will get forced past the threads and you'll have a mess.

Is there a reason you want to back flush? Is there some nasty stuff in there you can get out by bleeding them?

The system is completely empty at this point. I've got delinked brakes on my '78 Le Mans and I've just replaced the left front caliper, rebuilt the rear caliper and and replaced all the brake lines. I'd hoped to reverse flush to fill the system since it forces all the bubbles to the master cylinder and makes for a quicker bleeding process.
But what the hell, I'm retired and I do, in fact, have all day. Thanks for your help NP, you've confirmed my suspicions.  I appreciate it!