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P38A Abs sensors!! Fixed.

Discussion in 'Range Rover' started by Mark Piercy, Feb 8, 2018.

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  1. Mark Piercy

    Mark Piercy Well-Known Member

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    Thank you, not been near her today, diagnosing an Audi A4 with a popping air filter... I get all the best jobs....
    Anyhow, just to ask if the pressure switch was faulty, would it not fail to detect the presence of pressure and keep the pump running or cut the pump off earlier?
    Maybe not the best scenarios as examples!
    ;)
     
  2. Mark Piercy

    Mark Piercy Well-Known Member

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    are there any checks i can do on the pressure switch? without immobilizing my RR?o_O
     
  3. Mark Piercy

    Mark Piercy Well-Known Member

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    Maybe the accumulator has leaked and put some of it's nitrogen charge into the system.

    @wammers ,
    If it has leaked gas into the system, is it that the whole system would have to be bled out or just part of it?
    Thanks again..;)
     
  4. wammers

    wammers STILL BREATHING. Donater

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    Senior moment answering about wrong pressure switch so deleted. Sorry.

    .
     
    Last edited: Mar 7, 2018
  5. Mark Piercy

    Mark Piercy Well-Known Member

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    Hmmm..that is a lot of work!
    I'll start with accumulator and hopefully not have to finish with the pressure switch!!!:eek:
    But I'll be resetting the pedal out of curiosity...;)
    Thanks for your time;)
     
  6. wammers

    wammers STILL BREATHING. Donater

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    If that is suspected do the lot. See what you get out. You usually get a ticking noise as brake is applied if there is air in the ABS unit.
     
  7. Mark Piercy

    Mark Piercy Well-Known Member

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    Arhh, no ticking there sir!
    The brake performance has not changed a bit over the time I've owned it and still remains the same even with the fault..
    So far the RR god's have been fair to me. High mileage, pump rattle and timing chains pending an all!!:confused::)
     
  8. Mark Piercy

    Mark Piercy Well-Known Member

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    That was a very heated seat moment..
    Came off the motorway down the slip road under light braking, got to the roundabout at the bottom and the pedal decided to go further down than I really did expect....I'm sure my jeans were blue when I got in the car! I
    Guess the accumulator ain't storing shït..... She's off the road for the moment...
    The pump is still working, although at long than should.. I've no abs fault anymore and the brake pedal is as normal as ever......even still, no more driving... Damn it stinks in this here bus!!!!:eek:
     
  9. Grrrrrr

    Grrrrrr Well-Known Member

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    Check brake switch is behaving as it should with the Nanocom. New switch is only about a tenner anyway. It has 2 positions to monitor. If it doesn't get the second signal it won't assist with the braking, although pedal going to the floor like that sounds like air in the system somewhere. You can attach a normal Easibleed kit and the do first part of the bleeding process in RAVE where you flush through the accumulator (before you start opening brake bleed nipples). Just pump through 2 litres to make sure every last bubble is out. Then do the rest of the bleed. While you're under there keep an eye out for damp patches near the lines.
     
  10. wammers

    wammers STILL BREATHING. Donater

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    The brake switch has two functions. When the pedal is pressed cruise control is inhibited as one circuit is broken and brake lamps are applied as the other circuit is made. They must cycle in both directions and must never be both broken or made at the same time or you will get an ABS fault..
     
  11. Mark Piercy

    Mark Piercy Well-Known Member

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    The pedal switch is on the check me out list!
    The brake pedal feels as normal as it ever has?? Just that one moment coming off the roundabout.....
    I can hear the pump taking absolutely ages to charge, so I think a new accumulator is on the cards as well.
    I found at jgs4x4, for under 200€ and a wabco unit. Pennies being put aside for that.
    Thanks again.;)
     
  12. Wazzajnr

    Wazzajnr Well-Known Member

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    £89.99 at Island 4x4
     
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  13. Mark Piercy

    Mark Piercy Well-Known Member

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    Ooh ooh, thank you, I've found that some suppliers won't ship to here because of what it is, gas charged an all. Although some will??:rolleyes:
     
  14. Grrrrrr

    Grrrrrr Well-Known Member

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    Lie!
     
  15. Wazzajnr

    Wazzajnr Well-Known Member

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    I had mine delivered to Czech Republic from island no problem
     
  16. Mark Piercy

    Mark Piercy Well-Known Member

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    That's what I don't understand? It's their loss for those who don't..
     
  17. Mark Piercy

    Mark Piercy Well-Known Member

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  18. Mark Piercy

    Mark Piercy Well-Known Member

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    Yes! The accumulator is on its way!
    Weird thing is??
    The warning lights have stopped and everything is restored??
    Obviously charging a solid accumulator with no gas in it...
    Should be done this weekend!:cool:
     
    Last edited: Mar 7, 2018
  19. Mark Piercy

    Mark Piercy Well-Known Member

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    IMG_20180308_135437.jpg
    It's Christmas again!:cool:
     
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  20. Mark Piercy

    Mark Piercy Well-Known Member

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    We'll.. uneventful really... No problems to report, all functional. Easy repair with bleeding to follow Saturday to be 100% sure no gas has escaped into the system. Traction control works brilliantly! IMG_20180308_143634.jpg IMG_20180308_143643.jpg
    I forgot and left my windows open in the front... Thank god leather wipes clean:eek::)
     
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