Front brake issue..

[MTBLAZER89]

Trying to get my brakes on the K5 serviced. I have had the front lines open for awhile. Dana 60 has all new rotors calipers etc. Got the system bled well enough that the brakes stop the truck. I know I still need to bleed more, but I am buying new lines soon and its not being driven just moved around.

I noticed on the front calipers when the pedal is pressed the caliper tightens up and squeezes the rotor (as advertised). Here is the weird part. When the pedal is released the caliper relaxes, but relaxes to the point I can wiggle it around ie. gap bewteen the pads and rotor again.

Should it release this much? I always thought the pads would stay where the caliper pushed them to but just not squeeze when the pedal is released.

What could cause this? Tips tricks advice...

 

[dremu]

I gather the master cylinder is supposed to have a residual valve that keeps a slight pressure on the calipers to keep the pads floating on the rotors. In your case, perhaps your master is old and worn, or doesn't have that feature (is it the original type master or have you changed it for something else, like a Vette or van or whatever other master? Did you swap lines front-to-back?)

Also, what kind of gap are we talking about? 1/8", 1/4", 1/2"?

And what condition are your rotors in? Spin them once, make sure they're true and don't wobble 'cuz they're warped or your hub is skewed slightly or something.

-- A

 

[MTBLAZER89]

New rotors and they appear to spin true.

Master cylinder is stock and worked fine with the 10b up front.

It just appears that when the pedal is released the piston goes back into the caliper...

Not much of a gap just enough to be able to wiggle the caliper a little

 

[dremu]

Hmm. Some play is to be expected, but what "some" is ... =))

Maybe the holes for the slider bolts are a bit hogged out -- are the calipers' sliders new?

Oh, wait, does the D60 slide on the bolts, or does it slide in the bracket on the spindle like the 2WD dually fronts? Maybe that sliding surface is worn?

Doesn't sound like it's excessive, but what do I know.

-- A

 

[MTBLAZER89]

It doesnt have bolts like a 10b. It has a clip with a spring that holds the caliper in place.

 

[MTBLAZER89]

anybody else?

 

[noJeepshere]

Hate to break it to ya, but your calipers need to be rebuilt, IF the movement is excessive. What is the amount of movement? The square-cut O-ring that holds the piston in the caliper is stuck to the piston, pulling the pad back too far. It IS only supposed move just enough to release the rotors.

Oh, and the master cylinder should not have any kind of valve that holds a little pressure to hold the pads on, they were only used on 4-wheel drum systems and were a separate unit near or in the proportioning valve.