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Thread: How to bleed 120 series brakes?? Sound silly I know but...

  1. #1

    How to bleed 120 series brakes?? Sound silly I know but...

    Hey guys,

    Im a new to owning a prado and would never think twice about bleeding my brakes but I bought a Max Ellery's workshop manual that says I need a brake line clamp to block fluid flow to the calipers and to crack the pipes at the Master Res and let fluid leak out for a Minute!!!!

    Apparently this bleeds the Master Res first???

    It sound totally wrong and against the basic pricipals of what I know.....

    Tell me... surely I bleed my prados brakes in the same way I have bled all my vehicles in the past yes????

    If you have done a brake fluid change on a 120then get back to me!!!!

    Cheers .... time for a beer...
    HERS - KZJ120, BILSTIEN / KINGS, AMTS GEAR, RHINO GEAR, OUTBACK DRAWERS ETC ETC ETC
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  2. #2
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Interesting.....I would have just bled them as normal (clear hose from caliper to a bottle half full of water, loosen nipple, start at furthest from MC, slowly pump until clean fluid runs then tighten nipple)

    Wonder if we are wrong :shock:
    2005 GXL TD Auto. 265/70/17 Goodyear Silent Armours. Bilsteins and Kings Springs. 2 3/4" Beaudesert exhaust and dump pipe. EGT and Steinbauer Chip.


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    Pradopoint Guru! AJ120's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Quote Originally Posted by tassie tiger
    Interesting.....I would have just bled them as normal (clear hose from caliper to a bottle half full of water, loosen nipple, start at furthest from MC, slowly pump until clean fluid runs then tighten nipple)

    Wonder if we are wrong :shock:
    What is the reason for having the bottle half full of water? Never heard of that one before :?

    Cheers Andrew
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Never heard of water either, if anything - keep water away from it - brake fluid being hydroscopic tends to absord moisture and moisture in the brake line is never good.

    At least thats my understanding?
    2007 D4D 120 GXL Automatic - BLACK

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    Avid PP Poster! kav's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    i did mine just recently with my mechanic mate . changed fluid completely . just do it the same as normal , you will hear buzzers going off just keep the resevoir topped up . USE THE CORRECT DOT specified fluid .not some crap youve had lying around the garage . made a big difference to the pedal feel.ie less spongy .
    03 grande v6 , with added stuff that makes it go places . RTFM people !
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    Addicted PP Member MickL's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Apparently this bleeds the Master Res first???
    Only if you get air in it (ie; don't let it get too low while bleeding)

    Bleed lines/system as you would any other vehicle.


    Mick
    1KZ-TE Turbo Diesel, 5 speed manual, 3.5 inch lift, 265/70/17 Mickey Thompson MTZ, D-Tronic chip, Boost controller, mandrel exhaust, dump pipe, modified intake, ARB steel bar, Magnum winch, Safari snorkel, rear drawers, half cargo barrier, dual batteries, Uniden UHF, Sat Nav, reverse camera, Magellan XL , Tjm bash plates, ARB alloy roof rack, rear telescopic work light and numerous other modifications!!!
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Quote Originally Posted by AJ120
    Quote Originally Posted by tassie tiger
    Interesting.....I would have just bled them as normal (clear hose from caliper to a bottle half full of water, loosen nipple, start at furthest from MC, slowly pump until clean fluid runs then tighten nipple)

    Wonder if we are wrong :shock:
    What is the reason for having the bottle half full of water? Never heard of that one before :?

    Cheers Andrew
    The bottle is easier to rinse out later is all. We even used to throw a bit of detergent in it. Otherwise the bottle gets filthy (these were actual brake bleeding bottles that have the a hanging hook / hose holder thingamijig. If your chucking the bottle then dont bother.

    And water cant get up the tube into the brake system so thats not an issue.
    2005 GXL TD Auto. 265/70/17 Goodyear Silent Armours. Bilsteins and Kings Springs. 2 3/4" Beaudesert exhaust and dump pipe. EGT and Steinbauer Chip.


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    Avid PP Poster! Talktheroo's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Make sure you don't drop the fluid past the min. line on the reservoir tank on the master cylinder (do not let air into the ABS module). I always use a clear (PVC) pipe on the nipple so that you can see the air bubbles and it stops brake fluid going everywhere. Remove fluid from the tank down to the min. line with a syringe. Top up and bleed the rear left first until the fluid is clean in the master cylinder. Bleed the rear right next, then the front left and then the front right. This is the correct precedure for all hydraulic brake systems. I always use a flare nut spanner on the nipples as this prevents 'rounding off' on the nut (nipple or bleeder value). Dot 4 later models, early models Dot 3. Get an assistant to do the pedal work, down, release the bleeder value, fluid and/or air will come out, tighten bleeder value then up with the pedal. Repeat process until the new fluid comes out, different colour, that's why they put a dye in the brake fluid. Just remember don't let the brake pedal up until you have tighten the bleeder value otherwise air will be sucked into the brake system.
    Hope this helps.

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    Addicted PP Member samo's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    ive used a vacum bleeder a few times and these work a treat, when you are buy yourself, but it is a bit slower though
    had an 03 gx 120 with some gear now got a 2013 bt 50 GT auto some ARB gear.

  10. #10

    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Yes no worries peoples!!

    As I expected, there is no difference to bleeding these brakes as there is with any other set of brakes....

    ...My hilux has a Load Sensing Proportioning Valve that needs bleeding after the 4 wheels have been bled...

    As no one has mentioned it, I would assume the 120 Prado does not have one of these valves????

    Cheers again
    HERS - KZJ120, BILSTIEN / KINGS, AMTS GEAR, RHINO GEAR, OUTBACK DRAWERS ETC ETC ETC
    MINE - HDJ78 RV TROOPY. 1HDFTE. TWIN FACTORY LOCKERS. STEINBAUER POWER. OME LIFT. BEAST.

  11. #11
    Addicted PP Member MickL's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Quote Originally Posted by mackayvx
    Yes no worries peoples!!

    My hilux has a Load Sensing Proportioning Valve that needs bleeding after the 4 wheels have been bled...

    As no one has mentioned it, I would assume the 120 Prado does not have one of these valves????

    Cheers again
    Only early 120 GX's without ABS (before ABS became standard fitment) had LPV's. All models with ABS have EBD (electronic brake force distribution).

    Mick
    1KZ-TE Turbo Diesel, 5 speed manual, 3.5 inch lift, 265/70/17 Mickey Thompson MTZ, D-Tronic chip, Boost controller, mandrel exhaust, dump pipe, modified intake, ARB steel bar, Magnum winch, Safari snorkel, rear drawers, half cargo barrier, dual batteries, Uniden UHF, Sat Nav, reverse camera, Magellan XL , Tjm bash plates, ARB alloy roof rack, rear telescopic work light and numerous other modifications!!!
    Now with 3BAR MAP sensor & 18PSI Boost!

  12. #12

    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Thanks mick

    That certainly answers all of my bleeding qusetions...

    At this point I know my bleed job has been a success.

    What made me ask about all of this is that when I am stationary and press really hard down on the brake, the pedal slowly goes to the floor. Which actually is a bit concerning.

    But when I am driving, I need only to press down about an inch to get good grab on the brakes. And they actually stop the car fantastically.

    There has been a few posts about soft feeling pedals and chat about replacing Master cylinders....

    Is this soft feeling, floor dropping pedal normal or what???????
    HERS - KZJ120, BILSTIEN / KINGS, AMTS GEAR, RHINO GEAR, OUTBACK DRAWERS ETC ETC ETC
    MINE - HDJ78 RV TROOPY. 1HDFTE. TWIN FACTORY LOCKERS. STEINBAUER POWER. OME LIFT. BEAST.

  13. #13
    Addicted PP Member MickL's Avatar
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    Re: How to bleed 120 series brakes?? Sound silly I know but...

    Is this soft feeling, floor dropping pedal normal or what???????
    The Prado has a soft pedal compared to most vehicles but the pedal shouldn't go to the floor :!: .... This is usually a sign of an internal leak or defective Master cylinder.

    There was a recall at some stage due to a seal issue. Can't remember which years or models were covered. It was covered on here so a search would soon find it.


    Mick
    1KZ-TE Turbo Diesel, 5 speed manual, 3.5 inch lift, 265/70/17 Mickey Thompson MTZ, D-Tronic chip, Boost controller, mandrel exhaust, dump pipe, modified intake, ARB steel bar, Magnum winch, Safari snorkel, rear drawers, half cargo barrier, dual batteries, Uniden UHF, Sat Nav, reverse camera, Magellan XL , Tjm bash plates, ARB alloy roof rack, rear telescopic work light and numerous other modifications!!!
    Now with 3BAR MAP sensor & 18PSI Boost!

  14. #14

    Re: How to bleed 120 series brakes?? Sound silly I know but...

    No worries,

    I will look into the recall.

    Thanks again
    HERS - KZJ120, BILSTIEN / KINGS, AMTS GEAR, RHINO GEAR, OUTBACK DRAWERS ETC ETC ETC
    MINE - HDJ78 RV TROOPY. 1HDFTE. TWIN FACTORY LOCKERS. STEINBAUER POWER. OME LIFT. BEAST.

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