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Solved Back to the Car Brakes Part 2

Discussion in 'Random Discussion' started by hamster, Jan 21, 2002.

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  1. hamster

    hamster Guest Thread Starter

    Hey you car freaks!! Part 2!!!

    We installed in the new Rear Slave Brake Cylinder and No we did not bleed it But only drove it for like short while (one day---like 50 minutes all together)...

    Then we bleed it later...........

    But a few days after that it started leaking again!! We checked and that Slave Cylinder busted out!! The right Steel pusher was forced out of the cylinder???

    What caused that.. Was it because I didn't bleed it the first time???

    man... that baby just bursted out!!! What made it fly out like that??? I'm going to install it the second time but I don't think it's the bleeding thing that will stop that.

    Before we bleed it.. it was fine...??
  2. Dark Star

    Dark Star

    Jun 8, 2001

    Did you replace the entire unit or did you guys rebuild the one on there?

    It sounds as though your piston thingys are traveling too far and that is why they leaked and shot out of there..........
    also the wheel drum needs to be checked to be sure it has not been made too large by turning it on a lathe beyond tolerance, because if that be the case that is the problem.

  3. hamster

    hamster Guest Thread Starter

    rebuild a slave Wheel Cylinder that cost only $7.00?? What you crazy??? ha ha

    of course we install a brand new slave cylinder in that sucker....
  4. Dark Star

    Dark Star

    Jun 8, 2001
    Okay good, there is some reason why the plungers are having to come out so far before they make contact with the brake shoes.

    IOW, if they go out too far, then they will leak and might even come out alltogether. I suspect the wheel is been turned out beyond tolerance, so have the wheel checked at the parts house.

  5. jakoval


    Oct 28, 2001
    If this is an S-type Blazer we're talking about (with the wheel cylinder retained by a spring clip, rather than screws) then the hole in the backing plate is probably worn oblong, allowing the wheel cylinder to rotate. (This was a problem with GM 9½ " brakes of this type.Only real solution is to replace the backing plate - Wagner sells a two-piece kit that doesn't require axle removal.)
    Other possible causes - oversize drums (already discussed), failure to adjust shoes, resulting in excess piston travel.

    As to why this didn't happen until brakes were bled, there was probably enough air in the rear brakes that they were not working; ie, you were probably stopping with fronts alone. BTW, you ARE replacing the (contaminated) shoes aand degreasing the drums after wheel cylinder replacement, aren't you?
  6. MacFromOK


    Mar 18, 2001
    Also make sure the self-adjusters are correctly installed.
    And if you had both rear wheels off, the star-wheel screw
    adjusters are NOT interchangeable. One has right handed
    threads, the other left handed...

    Cheers, Mac :)
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