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Thread: Brakes Hot NO Pedal

  1. #1
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    Brakes Hot NO Pedal

    Was out 4Wdriving today and after several long very steep downhill runs the brake pedal went straight to the floor, no brakes at all, no amount of pumping would restore the pedal. In 40 years of Mechanicing I have never come across this problem, Discs were not discoloured or excessively hot, no brake fluid loss, brake fluid temperature not too hot, let sit for 1/2 an hour and brakes back to normal.
    This has got to be a Disco problem, i have never had this happen to any vehicle I ever owned before now, any Tips, Clues or Resolutions before I strip the brakes down, it is a 93 Disco, brake pads are OK, any help would be appreciated, never too old to learn, Regards Frank.

  2. #2
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    boiled off the oil in the calipers would be my first bet or they had enough water in em to steam up. when was the last brake fluid change..

    Ive seen this on a hydraulic brakes fault finding vid but never IRL..

    you may find the water that has turned to steam has now done one of 2 main things..

    1. been absorbed back into the brake fuild (bad)
    2. as it was steam its been forced out of the cylinders without leaving an obvious trace.. (also bad cause it means your brakes are shot)

    the only other thing that comes to mind is if you had glazing on the pads and with the help of some dust/debries on the discs thats been sanded away restoring the brakes...

    the only give away for that I can think of would be excessive scoring on the discs and pads and embedding of particulate matter on the leading edge of the pad tho this tends to happen more with drum brakes than discs.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  3. #3
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    wot he said! I have had it happen to me in a 71 ford falcon 500 around the tumut 2 resevoir in the snowy... oh what fun that was!

  4. #4
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    Quote Originally Posted by Blknight.aus View Post
    boiled off the oil in the calipers would be my first bet or they had enough water in em to steam up. when was the last brake fluid change..

    Ive seen this on a hydraulic brakes fault finding vid but never IRL..

    you may find the water that has turned to steam has now done one of 2 main things..

    1. been absorbed back into the brake fuild (bad)
    2. as it was steam its been forced out of the cylinders without leaving an obvious trace.. (also bad cause it means your brakes are shot)

    the only other thing that comes to mind is if you had glazing on the pads and with the help of some dust/debries on the discs thats been sanded away restoring the brakes...

    the only give away for that I can think of would be excessive scoring on the discs and pads and embedding of particulate matter on the leading edge of the pad tho this tends to happen more with drum brakes than discs.
    Rotors are in good condition, brake fluid was changed about 3 months ago as were pads and in good condition, no leaks anywhere, got me stumped, Regards Frank.

  5. #5
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    Quote Originally Posted by Blknight.aus View Post
    boiled off the oil in the calipers would be my first bet or they had enough water in em to steam up. when was the last brake fluid change..

    Ive seen this on a hydraulic brakes fault finding vid but never IRL..

    you may find the water that has turned to steam has now done one of 2 main things..

    1. been absorbed back into the brake fuild (bad)
    2. as it was steam its been forced out of the cylinders without leaving an obvious trace.. (also bad cause it means your brakes are shot)

    the only other thing that comes to mind is if you had glazing on the pads and with the help of some dust/debries on the discs thats been sanded away restoring the brakes...

    the only give away for that I can think of would be excessive scoring on the discs and pads and embedding of particulate matter on the leading edge of the pad tho this tends to happen more with drum brakes than discs.
    Rotors are in good condition, brake fluid was changed about 3 months ago as were pads and in good condition, no leaks anywhere, got me stumped, Regards Frank.

  6. #6
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    got me stumped then, unless....

    hows the vacume assist unit and the vac lines to that?

    did you actually get the pedal to the floor or did it stop short of the floor and because of the angle the unassisted brakes werent enough to pull you up....

    Theres one reaaaallll long shot but you should have had some brakes..
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  7. #7
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    G'day Tank

    I don't know if this is of help,

    1- Poor quality Brake Fluid, incorrect Dot grade.

    2-Poor quality brake disc pads, Incisor had this problem about 6
    months ago.on a steep slope in an Auto


    cheers

  8. #8
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    mine ended up being pads...
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

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  9. #9
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    Dave & UncleHo, Hard to the floor, absolutely no braking at all, had to use gears and hand brake to come to a full stop, I was only doing about 10klm/h, pumping had no effect, scary feeling, vacuum booster seems alright all air lines intact, brakes are working fine now, this happened, to a lesser degree about 3 months ago, drained fluid, replaced with new fluid, bled and relaced pads, Disc rotors are running true and have no scores or grooves, nor do they show signs of overheating, BTW it's an Auto, Good Quality brake fluid and Pads, Regards Frank.

  10. #10
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    the only thing i can think of is that the master cylinder got stuck......


    the fluid pushed past the seals.....the pedal hit the floor.....and the piston in the master cylinder stayed down.....
    as you were pumping the pedal it didnt really get a chance to return......till you gave the pedal a rest......
    then the piston slowly returned to its proper position......


    methinks......

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