Question about 1993 Mazda 626

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No brake line pressure on 1 caliper after replacing caliper

I changed the caliper on the front driver side an then rehn tried to build pressure an there is no sign of an brake fluid even trying to go to the brake caliper. the passsenger side front has fuild running when i check the bleeder screw. i'm stumped.

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  • 2 more comments 
  • dyhisreal Dec 17, 2008

    The hose was never removed from the vehicle and i have checked for any problems with the brake line being twisted or blocked but to no avail. all i did was just remove the old caliper an place a new one on an then try to pump the brakes so that i would be able to bleed the line but for some reason there is no pressure in that line at all.

  • dyhisreal Dec 18, 2008

    yes sir i am sure of how to bleed the brakes.... also the nipple is new. now after hours i saw that i was having the same problem with the rear drum on the passenger side. now i know that these two are linked right??? so does this problem have anything to do with the master brake cylinder, because i have brake pressure within the lines for the front right (passenger) side an also for the rear left (driver) sidedrum.

  • dyhisreal Dec 19, 2008

    ok i had a go at the master cylinder, well actually went out an bought a new one. replaced it and i am still having the same problem. now the only thing i can really think of is that there is a clog in the the tank holding the brake fluid because like the other master cylinder, i only have one line working. this is even happening when i bench bleed the thing "with a new master cylinder" should i check for a clog if only on port is applying pressure when in fact all three should be doing this job.

  • yadayada
    yadayada May 11, 2010

    blow air through the brake lines until u find the blockage.

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  • 58 Answers

I suspect you may have twisted the hose on re assembly. The other possibility is that the bleed nipple is choked with dirt and rust. Remove it completely and see if the fluid starts to run out. If so replace nipple or clean out.

Cheers John

Posted on Dec 17, 2008

  • 1 more comment 
  • John Muir Dec 17, 2008

    Have you opened the bleed nipple to get the air out of the system. Do you know how to bleed the brakes. Definitely a blocked bleed nipple!!

    Cheers John


  • John Muir Dec 18, 2008

    Sounds like the master cylinder. Sometimes when you fully depress the pedal to bleed the brakes the inner most piston sticks in and does not return. This means although you are pressing the pedal up and down it is effectively in the down position all the time, i.e. not drawing fresh fluid from the reservoir. Try tapping the m/c with a heavy spanner, then have a go at bleeding it again. If the car has ABS have a good look around the valve block for bleed nipples. If it has them bleed there first. It is also worth opening one of the other nipples where you have brakes. This will allow for more travel on the pedal when bleeding. Be careful not to get air in there though.

    Good luck
    John


  • John Muir Dec 19, 2008

    I take it the master cylider came with no reservoir. If thats the case given what you have described that wouldn't be a bad idea. If this is your problem it'll be a first on me and I've pretty much seen it all, or so I thought. Let me know what you find !! was this the reason the caliper was being replace or has this happened since?

    John


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