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brakes ????????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DALE, Jun 3, 2001.

  1. DALE

    DALE Registered Member

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    i have replaced the calipers,pads,wheel cylinders,rear pads, front hoses on my 90 blazer and bleed the brake lines and my truck still has a spongy brake pedal and almost goes to the floor to stop .could it be the master cylinder or the proportional valve that is not working. i really want good stopping power. also i am towing a 3000 lb boat. can you help ?
     
  2. Thunder

    Thunder 3/4 ton status

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    Sounds like the master cylinder to me. Mushy pedal going all the way to the floor is a sure sign.
    Did you adjust the back brakes? If they are way loose that might cause those problems too.
     
  3. 89Blazin

    89Blazin 1/2 ton status

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    Did you do the brake work because they were spongy? If so....maybe the power booster or master cylinder was the problem. If the brakes were firmer before, you still got air in the system somewhere.

    85 Burb and an 89 Blazer
    One just for fun, one simply for pleazer
     
  4. jarheadk5

    jarheadk5 1/2 ton status

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    With a 3000lb trailer, you really should have some kind of trailer brakes. If you've already got them, ignore that line.

    When you were bleeding, did you possibly let the fluid level get too low? From what I understand, getting trapped air out of a master cyl. is a royal PITA, and usually can't be done on the truck without power-bleeding.

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  5. Dirteater

    Dirteater Newbie

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    I was going to suggest the power bleeding. With all the new componants there is surely air in those lines. Be warned though, my brother tried to have this done three times before he found a shop capable of doing it correctly.
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    I had brakes that if I pushed hard enough, would go to the floor. Never would "pump up" right after I tried to replace the fluid. i spent three hours bleeding them. It was the master cylinder.

    Other symptom was sometimes the pedal would get "soft" (like at a light) and slowly go to the floor. Sometimes it would hold the truck, sometimes I would start rolling. Once I "pumped up" the brakes though, problem pretty much went away until i had to use constant pressure.

    Haven't hada spongy or overtravelling pedal since I replaced the MC.



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  7. bigblue

    bigblue 1/2 ton status

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    mine has been soft since i bought it 3 years ago. I thought it was just the way it was...She stops ok though...
     
  8. BurbinOR

    BurbinOR 3/4 ton status

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    Had that problem when we did the one ton conversion couple of weeks ago...........was air in the system. Had it powerbled and you can now break your neck with the binders if you want.

    Also make sure the rear brakes are adjusted properly - that too will cause this - should be manual adjusters to tighten them up with.


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