[dimitriaudio]

Hi guys , my 1995 4.0 rangie has no brakes. The pedal feels like there is no pression, the pump is running all the time , where should i start looking???
the pads and rotors were replaced recently (1month ago with no issues) Could it be a bleeding problem????
Thanks
Best regards from mexico

 

[kmagnuss]

How is your fluid level?
How is the fluid condition?
Have you noticed any leaks around the wheels?
Were you getting any abs/brake lights recently? Especially after braking?
Did the person who changed your pads/rotors bleed the system properly? (it's different than most cars)

 

[dimitriaudio]

Hi

The fluid level is ok.
3 lights in the dash are on! abs, handbrake,..
there are no leaks
The pump is running all the time.
Thanks!!!!
Help

 

[dimitriaudio]

HI again.
This is the part that is making noises, it sounds like its on all the time.

the syntoms of a bad brake acumulator????
thanks
I really apreciate your help, im in a holiday trip and me and the rangie are far away from home. i need to fix it right away.
Best regard form mexico

 

[kmagnuss]

the syntoms of a bad brake acumulator????

You got it.

 

[Jos Geuze]

Hi

If it is your pump that is running all the time without building up pressure you might have problems with the pump as there is a pressure relief valve that is fitted to prevent a build up of too much pressure.If it remains open you have no pressure.
It is also possible that there is a problem in the brake booster unit causing a flow from the pump towards the reservoir due to broken components inside the brake booster.

The pump is located just below the accumulator.The accumulator is a part that can not run but just absorb pressure shocks and consist out of a steel ball with a rubber bag inside filled with nitrogen. When the pump runs and builds up pressure the nitrogen bag is compressed until the max pressure is reached where the brake pumps pressure switch cut the power supply to the pump motor. During operation of the brakes the oil moves towards the calipers and the nitrogen bag expands and keeps pressure on the oil until the pump motor cuts in.

Beware of the pump running too long will cause it to burn out.

Regards

Jos

 

[dimitriaudio]

Hi,
the pump is pushing, air oustside, so its working am i right?
what can i do to check the relief valve???
thanks

 

[Jos Geuze]

Hi

The pump should be pumping fluid. Remove the suction hose and check free flow of brake fluid. If no fluid comes out you have to remove the expansion tank empty it and fill, flush and empty numerous times with white spirit to try to unclog the filters inside the tank. If free flow of liquid is possible refill with new brake fluid after reconnection of the pump and try again. let the pump cycle carefully until brake fluid comes out at outlet. Do this by applying 12 VDC at the terminals and make sure at the right poles so the pump moves in the right direction. You can also do this by applying +12 V at the fusebox connection of the relay after removing it. After fluid comes out reconnect hose and see if pressure is build up. If ok then proceed with bleeding the brakes. It might be a good idea to change all the fluid by draining off the old fluid until clear fluid is comming out at all bleeding points.

The pressure relief valve is at the outlet under the accumulator connection. There was a post regarding this a week or so ago.

Regards

Jos

 

[dimitriaudio]

Its me again!!
Finally i´ve got a new abs accumulator.
Now ihave replaced the old one, but i am still with no breakes.
WHat shoul i do??
The symptoms are the same
abs pump running all the time, lights on the dash on! , pedal with no pressure
should bleed the system??
Thanks

 

[diff]

Hi. Just thought I'd check in for some moral support. I read the above posts by Jos and wondered if you had confirmed whether or not fluid was flowing from the resevoir to the pump on the low pressure side. If it is your pump should pressurize the system and it should shut off if all is in order. Could you confirm his query?

 

[dimitriaudio]

thanks
im going to check all over again!!
i will let you know.

 

[dimitriaudio]

Hi. Just thought I'd check in for some moral support. I read the above posts by Jos and wondered if you had confirmed whether or not fluid was flowing from the resevoir to the pump on the low pressure side. If it is your pump should pressurize the system and it should shut off if all is in order. Could you confirm his query?

Hi again
There is fluid flowing to the pump on the low pressure side. In the high pressure there is fluid too!!!
thanks!!!!
I really need help here!!

 

[viperover]

I usualy attach a pressure gauge to test ABS pumps before replacing, its about the only way to confirm a pump failure or brake modulator failure

If you get a gauge or some one to test it for you make sure it can take high pressure as the system pumps up to 80bar