are duel system brakes realy ?

[IOPort51]

I have no experience with this so I thought I would ask here for input.

I have replaced the PV and the rear brakes and the lines from the pv to the rear calipers I have also disconnected and in doing so drained the lines from the master cylinder to the PV. So this means, basically , the system is pretty well empty of fluid.

I put together a vacuum system to draw fluid through the system from the MC to the rear calipers, still getting a few bubbles but I have sucked about a quart and a half of fluid through the lines. The front is still pretty much empty , it has fluid in the MC but the lines are dry and the PV is empty on that end.

I have no peddle as yet.

I am going to move to the front tomorrow night and hopefully something starts working.

I had always thought that the front and back worked pretty much independently.

any comments?

 

[73CJ]

Do the fronts then go back and do the rears. Most dual cylinders have to be somewhat close in pressure to bleed.

 

[IOPort51]

there are two lines from the MC to the PV and then two lines to the front and one to the back that splits at the rear axle to go to each wheel.

One other interesting factoid, there was no residual valve in the MC. I have to assume that there was a residual valve in the disk/drum PV.

 

[gert]

They are supposed to be seperated for safety reasons you also have a valve in the proporting valve to activate the idiot light when you run out of brake fluid. Also tour residual valve should be in the master cly, I think after you get fluid in the front brakes you will be fine

 

[Kane]

If you drained everything you most likely need to bench bleed the MC again otherwise getting pedal pressure will be a futile event. This is key to a tight system.

 

[IOPort51]

good point, I don't think I drained the MC but it could not hurt to pump it through by itself.

If you drained everything you most likely need to bench bleed the MC again otherwise getting pedal pressure will be a futile event. This is key to a tight system.

 

[jamie]

io, i saw a tool that forces fluid from the caliper to the master cylinder instead of vice versa. since air will always want to escape at the highest point, its easiest to push it out of the master cylinder. i think its called phoenix tools or something like that. i saw it on gearz. i havent used it, but i wish i saw it before i did a power brake swap. would have saved me hours of bleeding

 

[Purple77CJ7]

IO, are you using the MC/ brake booster I sent you? If you are there is no residual valves, I already removed them when I was using it. As to the master cylinder it sat for awhile, so bleeding the MC by itself would be a good thing to do.

 

[IOPort51]

No, I have not gotten that far yet. Power brakes are still a ways off.

Things are looking better, I have gotten the air out of the back and most of the air out of the front and it looks like I may have brakes soon.

IO, are you using the MC/ brake booster I sent you? If you are there is no residual valves, I already removed them when I was using it. As to the master cylinder it sat for awhile, so bleeding the MC by itself would be a good thing to do.

 

[IOPort51]

OK, I can lock up the wheels on dry pavement. Thanks Kane for reminding me to do something I should have done in the first place.