blowing air in master cylinder problem

martin182martin182 Member Posts: 3
edited February 2018 in Chevrolet
Hi,
Last time I had small accident... I broke up axle rear... so I changed this, and I changed wheel cylinder, springs, brakes shoe etc. (all rear brakes set)... and I bleeding brakes (rear cylinder wheel) and everythink was great... but when we closed rear vent then... was running blowing air in master cylinder (from FRONT brakes, wtf??) like on this movie....

https://www.youtube.com/watch?v=9ivN2PztDK8

pedal is working good but something is wrong, and I can't find any solution;/ can you help me?
sorry for my English I know he is like parts from china (do not offend Chinese) and sorry if I chose wrong section.
I have to try find solution abroad (USA, CANADA) because in Poland no one knows this car's, engine's like you... (you have many such cars, american muscle you know... you are masters) I love this car, I love American cars. help me fix my tahoe, please I don't want to sell it

Regards

I have tahoe 1996 5.7L
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Answers

  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    To normalne! You should never try to bleed the brakes with the lid off the master cylinder. The top part of the master cylinder must be very secure.
  • thecardoc3thecardoc3 Member Posts: 5,843
    That's not blowing air. The quick take-up design of the master cylinder returns some fluid back to the reservoir on the initial application of the pedal. So what that means is that jet of fluid squirting up is normal. Get the reservoir to it's proper level. Put the cap in place and then see if everything else is working correctly.
  • martin182martin182 Member Posts: 3
    Mr_Shiftright said:

    To normalne! You should never try to bleed the brakes with the lid off the master cylinder. The top part of the master cylinder must be very secure.

    heh, Do you speak Polish?:) But I'm not sure if I understand correctly. When I was bleeding brakes, lid was open... (master cylinder was open... you know). And top part of the master cylinder was very secure.
    thecardoc3 said:

    That's not blowing air. The quick take-up design of the master cylinder returns some fluid back to the reservoir on the initial application of the pedal. So what that means is that jet of fluid squirting up is normal. Get the reservoir to it's proper level. Put the cap in place and then see if everything else is working correctly.

    What do you mean..., everything else?
    When I closed master cylinder I have brakes.... but I affraid about this fluid.
    But what else... When I was bleeding brakes.... and vent/breather was open (with out protecting cup) master cylinder worked "normally" without pissing up... but when I closed breather then he started to pee. So I got scared.

    And I'm really surprised by your answers because many people told me that I had to vent the front too
    and some even that the master cylinder or ABS too. In European cars some fluid returns back too to the reservoir
    but the jet of fluid is not so strong. The jet is very, very low (1cm? max 2cm?) sometimes invisible so I thought something was wrong...;/ This is my first American Chevy and maybe there is difference between European cars;/ I don't have experience with such cars (American cars with large engines etc.) I bought an old car I wanted to give him a new life :) heh, I've always dreamed about American v8:) you know, but the stairs begin :(

    Or I should stay with bmw, no no, just kidding hehe :)

    It's like a dream come true now, you know... and I don't want give up :)

    eeh...And Now i completely stupid, Should I bleeding something more or not;/


  • martin182martin182 Member Posts: 3


    Hi,
    And didn't help... now I see I have very weak brake.... and pedal is a little spongy but it does not come to an end.... maybe should I bleeding ABS?
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