93 voyager brakes thumping

[invujerry]

Just did pads and rotors on the front of my 93 voyager, got a new set of anti rattle clips, and for some reason the brakes are thumping when I come to a stop. I bent the rattle clips to push the pads down a little harder, and the sound is greatly reduced, but the sound is still there when you lay into the brakes pretty good. I took it to a shop to diagnose it, and they said it's possible the new rotors were warped but they couldn't figure it out completely. Before I bent the rattle clips, if I jacked the van up with the wheel off, any time I hit the brake I could watch the pads walk up and down on the mount, and I could rock the caliper back and forth mounted up.

Any input would be appreciated!

[NAJ]

If you want to verify if the problem is with the rotors or hubs you need a dial indicator.
When installing new rotors all rust/scale needs to be removed from the hubs so the rotor will sit flat with no runout.
(Angled Die Grinder and 3M Rolec Disc's)
(As GM states.."You will clean until you have a Star Pattern on the hub")
Lateral runout cannot exceed .001", if it does you need to attempt to "match mount" the rotor and if .001" cannot be obtained check the hub runout.
Be sure the rotor can slide on/off the hub easily and the wheels are properly torqued.

When installing the pads the pad mount points on the spindles need to be clean of rust/scale and lubricated so both pads move freely.

The caliper slides need to be cleaned of all rust/scale and lubricated.

With the rotor and caliper installed(rotor secured with lugs) and the piston depressed you should be able to move the caliper back and forth by hand.

[ILIKESHELBYS]

My Charger did something like this. It turned out to be a loose caliper pin. It looked like it was properly installed, but it was not even screwed in place. Also check the caliper adapter bolts. Leaving them loose will of course cause the caliper to be loose on the rotor.

[Dr. Johny Dodge]

dittio
I was just about to say check the caliper pins - they may be loose , rusted and reduced in diameter or the rubber bushings couls be worn out

[invujerry]

Meant to leave an update.

Last week I went out and bent the anti rattle clips so they would apply more pressure to the pads. Voila, no more thumping! Thanks everyone for your help and suggestions.