My 98 2500 diesel shakes when i apply the brakes, kinda feels like a warped drum, feels like it's coming from the rear, but not really sure. I cannot feel the shaking in the steering wheel or in the brake pedal. I removed the abs fuse, still shakes. I Had all 4 tires off today and checked the rear brakes, they all seem fine, brand new drums on the rear because initally i thought that was the problem. I tried the parking brake to make sure it wasn't a drum, no shake with parking brake. I took a dial indicator and checked the inside and outside of the front rotors for trueness, they are all within spec, 3 thousands at most. all wheel bearings are good, ball joints, and just replaced the trac bar... I really am boggled with what this could be... Im going to remove that rear height sensing valve, I tried zip tieing it all the way up and all the way back, didn't make a difference. One of my front calipers was seized when we tried to push it back with a clamp, i have one orderd and on the way now... Anyone know if this problem could be the master cylinder? or what it could possibly be?

 

Not sure if your two or four wheel drive, but grab ahold of your sway bar links and try to give them a good shake and see if there is any play in them.

 

couldn't it also be bad control arm bushings i heard they can go bad and then the front rear shakes when the brakes are applied

 

it's 4 wheel, i noticed the sway bar links have a lil play...would that cause it?

 

Is the shaking in the front or rear? (edit: after re-reading post I see you think its from rear..sorry) I had a bad front end wobble that got worse until a slight touch to the brake pedal would start a violet front end left-to-right death wobble. Pulled both front rotors and they had many vertical cracks and (I assume but didn't verify this) were also warped.

Put on new NAPA drilled/slotted rotors and heavy duty brake pads, sanded caliper sliding surfaces and used caliper grease, replaced caliper bolts/sleeves/rubbers and used silicone grease and shake is gone and brakes work great.

 

Is shake at low speed or high? 15 MPH down or do at 30-60 MPH.
Could tires be badly out of balance or mud caught in wheel?
The bad caliper could cause a shake that you might not feel in steering wheel. Recomend replace both calipers and be done with that. Don't push old fluid back through ABS and into master cyl. Bleed it off.

 

If your sway bar links have play in them go to rockauto.com and get some new ones. If it doesn’t fix your problem at least you will have those fixed so they don’t cause more problems for you down the road.