Wheel Jump While Braking?

Has anyone experieinced front wheel hop while hard braking? I had this happen yesterday and it was like the front left tire was out of round . I am planning a complete rebuild or the brakes soon (wheel cylinders, hoses and shoes) but this is something I have never seen or heard of.

 

Sounds like a quick brake inspection is in order. Problems like this are usually only resolved by pulling the drums off and having a look.

 

Update: I was taking a left turn from a stop light this morning (about 20 mph) and the front end (left) started jumping again after I hit an off camber bump while rounding the corner. the wheel jumped until I slowed to about 5 mph. I was off the brakes this time.

This problem has me concerned.

When I say hop I mean it HOPS! The cracy tire is bouncing off the pavement an inch or so. I am going to rotate fron to rear for starters. The jump jerks the wheel and is a challenge to control.

The tires have under 5,000 miles and are balanced (smooth as glass from 0-55mph).

Could they be over inflated?

I am going to try some speed bumps in an open parkinglot to try to isolate the problem.

The right rear brake is wet with fluid and the right front seems damp (have not pulled the drum yet). Under normal braking the jeep pulls left (left brakes are doing 75% of the braking work).

 

Equipmet decription:

New Rancho 5000 shocks

New Leaf springs (4) (superlift 2.5" with the lowest-6th spring removed due to stiffness)

31X10.5X15 Cooper Mud Terrains (under 5,000 miles).

I did rotate the rear tires to the front during the new spring installation. I think I will change it back.

 

Recheck U-bolt Tightness?

 

Look at your front end parts also.

 

After a close look I am pretty sure it is a brake problem. The right front is doing almost all the braking. The left rear is soaked with fluid and the front right is damp with fluid. I think the left front is locking up which is causing the jump. The brakes are VERY old so I am going to replace all wheel cylinders, front brake lines and back and front shoes.

Does anyone have any suggestions on twin master cylinder to replace my single?

 

you may try autozone i just do mine .and i got all the parts i needed from them . my 68 stops good with 9" . you can go to autozone.com to see if they have the parts

 

Herm carries the kit you need to change out your MC. I think its $125 with a MC or $60 for the bracket alone.

 

Herm?

 

www.hermtheoverdriveguy.com

As a forewarning though, installation is a pain in the ***. You'll need to remove your current mc, cut-back the frame boxing up front, grind the rivets off your pedal shaft bracket, bolt in herms bracket on the bottom, weld the top and replumb. You may also need to fabricate a new brake pushrod.

HTH.

 

Is this a common wobble with these older CJ5s?

 

Do you check king pins like ball joints on a 2wd?

 

I am going to follow your advice and check the bearings and repack while I am doing the brake job.

Did you hace to remove the drag link to check the springs?

Are the springs available without having to purchase the drag link?