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There must be air in the system some where. i am not sure of the year ,make and model of this van and also not sure of the brake system, for example if you have drum brakes in the rear then first adjust them. The next step is to fill the master cylinder, make sure there are no leak anywhere.Next step start at the master cylinder, at the line to master do not worry about abs system. have someone inside ready to pump brake pedal and hold.Have them pump pedal three times and hold pedal with a little pressure.make sure as you open the bleeder they push on pedal and keep foot on brake until you tell them to pump again. the pedal is to be pumped three times every times. With pedal pumped start at master lines, open one allow to bleed a little then close and move to next and allow to bleed. if master has more than two lines then pump again and do two, open one and close then open two and close then pump again. After master is bleed a few times and no air comes out then move to right rear wheel, pump three times and hold while you open bleeder, this is to be done about four times to make sure you get a good flow of fluid with no air . NOTE: always keep master cylinder full, check after each wheel. make sure the person pumping the brakes does not lift until you say and the bleeder is closed. After the right rear wheel you will move to left rear and then right front wheel and last is the left front wheel. Make sure there are no bad wheel bearings, lift wheel of the ground and grab and check for movement by pulling wheel out and in from top to bottom, the last thing is make sure the caliper slides are free moving. If the caliper does not slide on the bracket freely then the piston will not stay on pad and pedal will need to be pumped to get a pedal. good day.
Power and manual have the same equivalent Power is just easier to apply than manual To BLEED brakes properly and this is the only way which will be correct is to start at the furthest point and work your way to the closest point upon completion. If not done this way air will be still in the lines
I read this same problem all the time, the reason u can't bleed the lines is that a special tool is required that pluge into the ABS and holds the hydraulic valves in the ABS control open for bleeding, there is no way around this.
You need a special tool that plugs into the ABS hydraulic control unit and holds the POP-IT valves open to bleed the air out, unless you have that tool you will keep spinning your wheels, most brake shops have a tool to do this or the dealer of course will have it.
There is probably still just some air in the system, it only takes a small amount to have no pedal. Did you bench bleed the master cyl before installing? Start bleeding the brakes again, start with the wheel the greatest distance from the master cyl. bleeding until no air is evident, working your way closer to the master cyl, doing the closest wheel to it last. Check all the new brake line connections. A slightly loose connection would allow air into the system, making it impossible to bleed it all out. Make sure the master cyl level never drops too low, or you will be pulling in air and have to start all over. Good luck.
"have put all new breaks, lines, sensors." For the Mechanic to get the brake fluid in the line to the calibers. It has to be pump by stepping on the brakes pedal. You said "no breaks" so that did not happen.
My question is does the master cylinder work? A lot of work was done that was not needed to be done. The Dealer will not do any thing if they did not work on the brakes. If the Dealer did this job then you can complain about them.
The black box you are referring to is call ABS control module. It should be on under the hood on the driver side of the radiator. These units do fail. You can go the the Auto store and ask, if they carry it then they will know where it is locate. You can also go to Dealer parts department, they will carry the part and can show you where it is locate. If you do replace the control module, make sure the brake line is properly bleed of all air. I do hope this help you