Hey There,

Im brand new to this forum. . .But I have a question (don't we all). I have had my truck for a little over a year . .bought it used . .it was running fine but it had developed a rear wheel or rear end bouncing at about 55 mph when you apply the brakes. The first time it happened it shook so hard I thought the truck was gonna come apart never felt anything like it. Took it to the shop and checked the rear brakes. Brakes and hardware were good, drums outta round so I had them cut. Went out for a ride still happening, mechanic thought it was in the front. .So brand new rotors, calipers, brakes and hoses . . took care of those front breaks. . .stops great now . .but just today once again on my ay to work it started bouncing . .OK HELP . .has anyone heard of this and what's the resolution

 

Had a similiar problem ony 93 k2500. I changed the drums out and still had a "bounce" syndrome. Turns out when the drums become egg shaped it shapes the shoes that way. Changed the shoes scuffed the drums problem solved. Give er a shot.

 

so was it fixed for a short period of time and the problem returned or never fixed at all?

 

Tech2,
The problem was never fixed. Because its doesn't happen all the time it's hard to pinpoint exactly what the problem is, weather it's in the rearend, driveshaft, or even the rear brakes . .Any idea's ? ? ? ?

 

does it transfer into the brake pedal or steering wheel when braking?

does it happen when only the e-brake is applied?

any vibration during hard acceleration?

 

I know this sounds odd, but I think you should look at the Tires/Rims.

1) Do a careful inspection of how the Tire Beads are seated on the Rims.
Should be a equal line of the Bead as it relates to the edge of the Rim for both the Interior and Exterior Beads.
2) Look for stress lines in the Interior and Exterior Sidewalls of the Tires.
When the torque of Breaking is applied, stressed/broken casing plies in the sidewalls can cause several strange problems.
3) Try elevating the Tire Pressure to just below the Maximum Cold Inflation Pressure, noted on the Sidewall of the Tire.
Any problems with the casing plies is more likely to show up as Blisters or Bulges in the Sidewall or Tread. And at the elevated
pressure, you're very likely to get better gas mileage.
4) Assure that all four Tires are of the same size, age and wear, and are well Ballanced.
5) Lift each Wheel, do a visual inspection of it's stability in rotation and any variations in alignment to the Axel center, or wobble.