I have dv8 hydro bump stops up front that makes a thud noise every time I hit a bump in the road, go over a speed bump, or coming and going from my driveway. As the Jeep sits, there’s about 1.5” between the rubber pads on the axle and the plastic bump stop bottom. I can’t change this gap as it will change the upper limit of the stop.

Anyone have hydro bump stops and also have this noise? I can’t think of how to fix this, it’s not necessarily a problem but it’s somewhat a nuisance.

Also, I know dv8 is kind of a cheap knockoff brand so maybe these bumps aren’t progressive and a cheap design makes this noise? If I spent the extra cash on some king bumps that are progressive, will this noise still be there?

 

I have the ICON hydraulic bump stops and they are silent.

 

What material of pads do you have on your axle?

 

It is a urethane type material. The pad on the bottom of the speed bump is a similar material.

 

I was kinda wondering if I’d have better luck with putting a plastic pad or washer over the top of my rubber pucks on the axle. I had a theory that the plastic pad on the bump stop was hitting the rubber puck on the axle and gripping it and not allowing any room to slide on the puck because the materials were gripping too much. Maybe the noise is the bump pad skipping on the rubber puck?

 

You relly need more than 1.5" between the bump and pad. Are you sure the thump is not the air bump bottoming out? What pressure are you running in them?

 

Id love to have more distance between the bump and the pad but unless I carve up my fenders and body to allow for more up travel, I can’t really change that. The bump stops are adjusted at their height so that when they’re compressed, the wheels aren’t trying to eat the Jeep.

Im 99.9% positive the noise isn’t from the bump stop bottoming out because the noise happens even when hitting a small bump when it’s highly unlikely that a small bump will allow 4” of suspension up-travel. As for the pressure, it’s whatever the factory setting is. I haven’t found any documentation on servicing these bump stops so I’m cautious to take anything apart on them without knowing what I’m doing.

 

Were they charged from the factory? Some come empty. I would start at 150 psi and you should be able to go up to 400 psi on an air bump.

 

I looked at a few YouTube videos of people adding sleeves inside the bump stop to reduce the travel. That’s the only way I know of to add more than 1.5” between the bump stop and the pads on the axle. Should I do this or leave the 1.5” gap?

Also, I’m assuming the pressure inside is just set to determine how hard the bump stop will be and how easy the axle will force it up. Since I don’t do any racing or jumping, a lower pressure will be fine right?

 

Since you don't have a lot of up travel you would want to run a higher pressure to keep from bottoming out. Adding a sleeve is not going to do anything for you, you will want as much of the air bump travel as you can get.