Homemade pressure brake bleeder?

[speedy341]

Would it be possible to make a homemade pressurized brake bleeder by...

Taking an old master cylinder cap, drilling a hole in it, use an air tight fitting and attaching a hose to it, and attach that to a pressurized bottle held upside down full of brake fluid, the cracking the bleed screw?

This would be used on a motorcycle where the master cylinder cap is held on by screws and is air tight.

 

[moribundman]

As a pressurized bottle, use a sprayer. That's what the Motive pressure bleeder really is, a modded sprayer. You don't have to hold it upside down while cracking the bleeders. Better add a pressure gauge to the homemade sprayer, so you don't over-pressurize the contraption. If you got the parts like NPT fittings and pressure gauge, go for it. Otherwise you might as well buy the Motive Bleeder. It's about $45-55 with shipping.

 

[SHOZ]

The newer MC are vented and very difficult to get a good seal on with the cap.

What I do is take a length of appropriate sized clear vinyl hose, insert a short bolt in the drain can end and put a hose clamp around it. Then just above the bolt cut a 1/2" slit in the hose.

At the caliper end put the hose on and use a hose clamp to secure to the bleeder screw.

Then pump the brakes as you normally would. As the fluid is pushed out the hose the slit opens, when the pressure is off the hose the slit seals up. Works great.

 

[beanoil]

On a bike, a mity vac is the ticket. Sucking from the wheel cylinder works fine. Just keep the master filled.