d-series brake booster.

Discussion in 'General IH Tech' started by bjornebraten, Jul 10, 2019.


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  1. bjornebraten

    bjornebraten Farmall Cub

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    Have a brake problem. everything is new. Pedal goes to floor . Have bleeded whole system several times with vacuum bleeder , but no pedal. Took master cylinder apart , but looks ok. Is new. No visible leaks. Proportion valve not stuck.
     
    Last edited: Jul 13, 2019
  2. Rjones

    Rjones Farmall Cub

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    I'd say, if everything is new, and everything is bled good, including the master, and there are no leaks, is has to be the power booster. Assuming the pushrod is in and correct.
     
  3. TheCrazyFarmer

    TheCrazyFarmer Farmall Cub

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    Ok, I am pretty new to this, so take everything I say with a grain of salt. This is just what I've experienced with my truck.

    Also I've got a 68 1100C, so I don't know if this applies to your vehicle.

    I know I had to bleed the brakes on mine for a long time. I bled them for a while, and they got worse before they got better. I could push them to the floor, and they felt really squishy. I bled the crap out of them until the person I had in the cab pressing the brakes said they were feeling stiffer. I stopped after they wouldn't go to the floor anymore, and now the work great!

    As you bled, was it getting stiffer?

    I have never used a vacuum bleeder before, so I have no idea what the procedure is for doing that.

    I know this is a stupid question, but you are keeping the master full while your bleeding right? Sorry I'm sure you know way more than me, just thought I'd ask.
     
    Last edited: Jul 12, 2019
  4. RinTX

    RinTX High Wheeler

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    Did you check/set proper gap between master cylinder and booster rod?

    I’ve always found the two person bleed method to work best.
     
  5. bjornebraten

    bjornebraten Farmall Cub

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    Pushrod is in.have pumped over 1 litres through system now. Could it still be air in m.cylinder? Both booster is refurbished and m.cylinder cardone is new from rockauto. Have ordered a new wagner F73355 now. Someone told me that cardone is junk and refurbished. Is this true?
     
  6. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Yes sir ! Roflmao...sorry viking
     
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  7. Randall Barringer

    Randall Barringer Y-Block King

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    Did you bench bleed the master before installation?

    Sent from my Moto G (5) Plus using Tapatalk
     
  8. bjornebraten

    bjornebraten Farmall Cub

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    Done that. Think i got wrong master cyl. It has a dust cap and trucks with booster should not have this.
     

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