Bleeding new brake system without an engine- need to wait?
 

Ive finally completed the install and i wanted to test for leaks and thought to bleed the brakes. I may be premature, does the engine have to be running to do this? Just to test for leaks? I havent installed the engine and was hoping to test for leaks first in the brake system.

I bought the plug for the prop valve and replaced the sensor with it. Ive got a bleeder kit also ready to start, just wasnt sure what I should/shouldnt do next.

Re: Bleeding new brake system without an engine- need to wait?
 

No bleed away if you have power brakes hook a shop vac up to test pedal

Re: Bleeding new brake system without an engine- need to wait?
 

Bleed it.

Re: Bleeding new brake system without an engine- need to wait?
 

Thanks guys for the quick replies, I actually dont even have the brake pedal installed yet. I'll hook that up first, been putting it off since the interior hasnt been covered yet with noise reducer mat stuff.

Re: Bleeding new brake system without an engine- need to wait?
 

You don't even need a pedal, you can push in the back of the master. Even easier, gravity bleed it, it's full of air. Let the gravity do the work for you...

Re: Bleeding new brake system without an engine- need to wait?
 

That's what I did first is gravity bleed. Then used the pedal to check everything after. Went much smoother that way.

Re: Bleeding new brake system without an engine- need to wait?
 

X2 on gravity bleeding .
Make sure you bench bleed the master cylinder first before you bleed the rest if the system.

Re: Bleeding new brake system without an engine- need to wait?
 

That right there is all it takes...and a little patience until all them air bubbles stop. I'm beyond that calling up from underneath with responses, "Up, up, down, down", rinse and repeat. :lol:

Re: Bleeding new brake system without an engine- need to wait?
 

After decades of the two person brake bleeding I finally bought a pressurized brake bleeder kit similar to the one I used in the Army Motor Pool for about $110 found it on Amazon.
https://www.amazon.com/Bestauto-Pneu.../dp/B07TMYSSN7

Re: Bleeding new brake system without an engine- need to wait?
 

That will do way better that the tinker toy I used. I went cheap after having to buy the expensive flaring tool that did perfect by the way...no leaks!!

Re: Bleeding new brake system without an engine- need to wait?
 

Yeah, I oughtta get one of those. I had access to one when I worked as a mechanic, but after graduating uni in '83, I lost that use.

Re: Bleeding new brake system without an engine- need to wait?
 

Bench bleeding with a syringe is the latest greatest way to do a master cylinder.

https://www.youtube.com/watch?v=USdtwqju4GY

Re: Bleeding new brake system without an engine- need to wait?
 

I’ve installed Speed Bleeders on three of my vehicles. Makes it a one person job. No complaints. They make it very easy to flush the entire system with new fluid as well.

Re: Bleeding new brake system without an engine- need to wait?
 

Good idea, I would have never thought to use a vacuum! You learn something new every day.

Re: Bleeding new brake system without an engine- need to wait?
 

Duplicate post

Re: Bleeding new brake system without an engine- need to wait?
 

Front disc, rear drum???
If you have all drum or just rear drum, make sure the shoes are adjusted, and can even be adjusted a little tight, before bleeding.

I also gravity bleed to start.

Re: Bleeding new brake system without an engine- need to wait?
 

Now those are cool. Kinda expensive but I guess you could use and remove them for use on other vehicles.