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No front brakes :(

Discussion in 'Truck & Equipment Repair' started by mcwlandscaping, Feb 4, 2008.

  1. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    I don't know what is going on but my front brakes don't seem to work very well at all. The rear locks up becaues of this and you notice that the front doesn't drop at all like it should when the front brakes are applied. I have the ABS in my truck unplugged so that should not be a problem, but, figured ide say so in case it could be the problem....that's been unplugged since last year....when the truck is jacked up and wheels off, you can spin the spindle by hand and it seems like the brakes grab and hold then, just can't tell how much. I replaced the master cylinder and that slightly helped (i needed one anyway) but the front brakes are still not doing anywhere near what they should. The pads on the fronts are at 1/2 to 3/4 so they are fine, however the calipers could very well be the originals. Could this be causing my problems? Any help at all would be awesome......btw, all brakes were bled correctly when we did M.C. change.

    -mike-
     
  2. Clapper&Company

    Clapper&Company PlowSite Veteran
    from NE OHIO
    Messages: 4,413

    Did you check you Blinker fluid ????


    LOL J/k

    I would check in to the calipers if i was you !!! Its hard to know whats going on by reading and not being there but calipers would be where I would look next !!

    Good Luck mike
     
  3. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    LOL, you won't believe how many people at the school shop we can trick into something like that, or headlight fluid..etc.!!! haha

    Calipers will be next, i do believe they should be changed anyway since they are so old...thank you for the response!!

    keep em' coming guys!! :)

    -mike-
     
  4. KGRlandscapeing

    KGRlandscapeing 2000 Club Member
    Messages: 2,660

    did u blead them? just a thought and y do u have the abs unpluggd?

    and its obviously not the blinker fluid its gotta be a bad muffler bearing come on now

    crap ok i see that u said u bled them. what about the rotors them selfs r they glazed? what type of pads did u put on? do the rotors have high spots r they warpped dose the peddle do anything weird when u stomp down it pulse or anything when trying to brake.
     
    Last edited: Feb 4, 2008
  5. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,518

    Did you kink the brake line going to the front ?
     
  6. Dstosh

    Dstosh Senior Member
    Messages: 534

    Maybe the pins on the calipers arent sliding. I would say take the whole calilper and rail off and then push the break petal and see what happens. Good Luck
     
  7. exmark1

    exmark1 PlowSite.com Addict
    Messages: 1,321

    I would have to say your problem is the calipers, they may just need to be cleaned up or replaced!
     
  8. sechracer

    sechracer Senior Member
    Messages: 478

    I would check the main brake lines too..... But calipers are always a problem..... Another thing to check would be the brake booster.... Loss of vaccuum to it?
     
  9. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    KGR, the ABS is unplugged because there is a problem with it that can't be detected...it says that it's functioning fine but really is dangerously messed up, what happens is around 3 MPH (when its suppose to kick on when it is NEEDED) when coming to a stop the abs kicks on and the brake pedal falls to the floor and vibrates, speed sensors were changed and that didn't correct the problem. I never had ABS on any other vehicle and i know how to drive without it, so, it got unplugged and that solved the problem.

    Brake calipers and rotors are being changed today after school. A number of you also mentioned kinks and problems with the brake liines, that will certainly be checked as well. I will let you all know what the problem ends up being tonight! Thanks for all the helpful advice as always!!!

    -mike-
     
  10. streetfrog

    streetfrog Senior Member
    Messages: 337

    Mike that is a common problem with chevys. (the abs) You need a new abs comp and GM does know about it and so does every mechanic worth a salt.... As far as the brakes not working it is probably the calipers AND the rotors glazing because of them. The slides lock up on those and if they are original then its a good bet they are junk. I just replaced mine on my 94 because of the same problem. I replaced the rotors also as they were glazed because of the calipers not working correctly.
     
  11. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    Any idea on how much this computer costs? last i checked it was around 600 for the whole unit, i don't know where you can get the chip separately...just unplugging it worked before, i don't see why that would cause this problem all of a sudden.

    Calipers nor the rotors were glazed when i took them off

    Update for everyone, we spent a few hours on the truck last night, everything is apart, we decided to do ball joints while we were in there (drivers side needed it bad) so it's taking us an extra night but i think the extra time spent is worth it.

    If anyone can tell me some sort of price on the ABS computer if i can just change that, that would be great!

    thanks,
    -mike-
     
  12. streetfrog

    streetfrog Senior Member
    Messages: 337

    The ABS comp wouldnt cause the problem you are having. I was just giving you a FYI as a mechanic for 20+ yrs. The comp runs from $750- $1100 new. Used about half but no guarantees. Unplugging it is usually what I recomend due to the price. ABS Is overrated on trucks especially plow rigs anyway. Mine is unplugged for the same reason as I can't afford nor see spending that kind of money on something that I don't like anyway.
     
  13. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    OHH, thank you very much!!! i understand! i totally agree, i don't need abs on a truck...on a car i could see it being nice. I think you are located relatively close to me, we should meetup sometime!!

    thanks again,
    -mike-
     
  14. streetfrog

    streetfrog Senior Member
    Messages: 337

    Hell yea. I am in Hudson right off lowell rd. I am in Nashua constantly. Just not to plow lol. I do Hudson and Litchfield only. Looks like a crappy day tomorrow. 1/2" of ice then going to snow, 3-6" Starting as rain. Looks like I will be salting first. Call me sometime. 660-1629 Ken
     
  15. sparky8370

    sparky8370 Senior Member
    Messages: 234

    Does that truck have a proportioning valve? If so try and push the brake pedal real hard to reset it and then pump up the brakes. That happened to me with an old chevette (My first car.). I replaced some front brake lines, bled everything but they still didn't work. Then my Dad told me to do that and they worked great.
     
  16. jcesar

    jcesar Senior Member
    from Mi
    Messages: 492

    2 things I have found, with Chevy Brakes.
    First, use ceramic pads.
    they will sqeak a little, but they improve pedal.
    second, the rubber lines, that go to the caliper, try replacing them with steel.
    as the rubber gets older, when brakes are applied, they will expand, allowing the fluid to stay in the line more so than continuing to the caliper for proper pressure.

    new calipers will help as well.

    JMO
    good luck Mike!
     
  17. KGRlandscapeing

    KGRlandscapeing 2000 Club Member
    Messages: 2,660

    ya know i never did understand y they put rubber flex tube on them. i mean i know so u can turn the wheel and have travel. but all the rest is high pressure then at the wheels u have rubber lines
     
  18. jcesar

    jcesar Senior Member
    from Mi
    Messages: 492

    me either. But as far as wheel travel, if that is the question,

    They make an aftermarket flexible steel line, that is high pressure, to fit it..
    I replaced them on my chevy, and I thought it made quite a difference.
     
  19. accentlawn

    accentlawn Member
    Messages: 50

    be careful with the ceramic pads. I know for a fact certain manufacturers specifically state that ceramic pads shouldn't be used even though they are made available through the aftermarket by Wagner and Raybestos. I haven't ever heard of any trucks that have specified not to use them but I know Cadillac has that note and it causes the vehicle to have POOR brake performance.
     
  20. accentlawn

    accentlawn Member
    Messages: 50

    Did you bench bleed the master cylinder?