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LR4 brakes soft/hard

Discussion in 'LR4' started by sceh, Apr 28, 2021.

  1. gsxr

    gsxr Full Access Member

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    I believe standard DOT4 and DOT4-LV are both glycol ether and borate esters based. I believe the LV version has a minimum 10°C higher wet boil point (155C std, 165C LV) while the dry boil point is minimum 20C higher (230C std, 250C LV). Note those are DOT minimum requirements and many high-performance brake fluids will have much higher boil points.

    I wonder how many people replace the brake fluid every 3 years (or 45kmi) as specified in the manual? And, that is reduced to 2 years / 30kmi for severe service...

    :eek:
     
  2. Stuart Barnes

    Stuart Barnes Full Access Member

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    I guarantee the previous owner to me didn’t. I have a brake bleed receipt from pep boys.

    so it’s on the list pretty soon.

    as far a severe service goes, that’s pretty much the maintenance schedule I’m using. The poor thing is in la traffic on the school run and at least 2 out of 4 weekends on some sort of dirt trail exploring.

    Stu.
     
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  3. ktm525

    ktm525 Full Access Member

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    I have found brake fluid deterioration is also correlated to the relative humidity the vehicle lives in. Brake fluid loves water. Here it is very dry and I swap brake fluid maybe every 5 years and it never looks all that bad.
     
  4. sceh

    sceh Well-Known Member

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    Right. I did the one-man method as in the video I posted. Engine running. The pedal was pretty hard starting at the rear offside brake - very odd feeling. I pushed hard but could not feel proper movement as though fluid was being pushed through. I did that brake and then switched to the other rear brake and it felt better - as though when I pressed there was fluid flowing. Did the other rear again and then the fronts. I then tried the car on the driveway, braked and nearly went thought the windscreen! Sharp and hard and brilliant!!
    I suspect the first brake had the nipple still a bit tight but in any event it worked perfectly and the brakes are now superb.
    I found no leaks so still wonder how the brakes were soft and had air somewhere though.
    Indeed you do need to pump the brakes 28 times for the rear and 10 for the fronts. Th rear has very little movement unlike the fronts
     
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