help grinding brakes making me looney

[jrstroh_96]

Hello, i came here cause every person i know is lost and im tired of spending money.I have a 92 K1500 ext gmc. Sitting on 6-inch lift and 35's. I bought the truck last january. I have had this lovely grinding sound coming from both front brakes and a pull to the left. so i replaced the left wheel bearing, both sides rotor calipers and pads. figured that would work, nope.Replaced brake lines, still nope. The sound is weird before i replaced bearing it would go away if i made hard sharp turns either left or right no it dont do that. But now it gets weirdier. When coming to a stop they grind as if, i'm metal to metal. Then they stop and dont start grinding again until around 300 yards to a quarter of a mile down the road. Sometimes it grinds like i have a warped rotors but then theres times it dont stop. This goes on at all speeds. Now im thinking its the proportioning value, but the local dealer wants 271.99 for a new one, and local salvage yards cant look up this code of JB5 that my truck has for brakes and from what the dealer tells me is only in K series 1992-1994. So im lost, please someone help.

[Klon]

there is no way its the proportioning valve. be sure to check the rear brakes and verify. i am a mechanic. dont waste your money. its something else.

[jrstroh_96]

Thanks I'm going to check and see if the lift kit i still tighten and then take it to a alignment shop again. and see where im at from there

[vncj96]

A warped rotor wont give you grinding it will be vibrating and excessive pulsating when braking. I would pull the front rotors and take them to a shop, even some oreillys and autozone can resurface rotors if they need to be done, have them give them a check. Just because brake parts are new doesnt mean they are true. I would also check your cv axles up front.

[tbplus10]

Check the inside of the front rims, is it possible you have a wheel rubbing the caliper or something on the suspension?
I've seen this happen when you change to wider wheels, and I'm guessing when it was lifted they did it to put on wider wheels and tires.

[jrstroh_96]

ok what am i looking for on the cv shafts and i still have the stock rims on the truck

[vncj96]

Look around the boots of the cv axles, are they leaking any think fluid, or cut. Grab a hold with both hands of the boot and shake it, maybe the joint inside broke.

[jrstroh_96]

ok thanks i did find that my left side tie rods shot and just replaced both sides last year.

[jrstroh_96]

Finally figured it out. The ball joints, tie rods and upper bushing was shot. And the grinding was the dust coverrubbing on the backside of the rotor. All done and quiet.