2nd Gen Non-Engine/Transmission disc brakes

[jameshaines]

howdy, have 98 12v 4x4; does anybody know how the sam hill the front rotors come off? have already removed the calipers and large nut with the cotter pin; but the rotors still do not come off

james

 

[tgee43]

You have to press the lug studs out to release the rotor.

 

[CCiatteo]

If I remember correctly you have to remove the hub/wheel bearing assembly, then press out the studs, which will release the rotor. Maybe it can be done on the truck, but I think the hub assembly needs to come off the truck first, then you can proceed to press out the studs. The hub assembly is held on with 4 12-point bolts that are on the backside of the spindle/knuckle. Do a search on here, there are plenty of threads outlining the various ways to get the hub assembly off.



Here's a good link to the process with some pics and the tricks.

https://www.turbodieselregister.com...ors-replacement-99-2500-4x4-hub-assy-too.html

 

[Joe Mc]

James, A bit of a PIA but the hardest part is getting the bearing/hub assy off the front diff. The instructions linked above are spot on. If you don't have one see if you can get a brass drift (about 3/4" dia and 5 - 8" long) this will allow you something to hit other than the studs for removing and replacing them. Slow and steady gets the job done. Have fun.

 

[jelag]

If you wanting to turn the rotors, the machine shop will want the hubs attached so that they can align the rotor lathe on the races for better accuracy... if you going to replace the rotors its much easier to use a press...

 

[JMcCoy]

Unless the rotors are ruined, warped, or under spec, Just scuff them and hang the pads.

 

[1tuffram]

If you wanting to turn the rotors, the machine shop will want the hubs attached so that they can align the rotor lathe on the races for better accuracy... if you going to replace the rotors its much easier to use a press...

Is it better to turn the rotor on or off the truck. I thought I remember several years back it was mentioned turning the rotors on these trucks was the best. I can't remember the reason, but maybe it had to do with hub/bearing assemblies getting destroyed when trying to get them off the truck. Maybe it had to do with less rotor run out when turned on the truck.

 

[Cummins12V98]

Best way is to turn rotors on truck if there is enough meat left.

 

[jelag]

The throw away dimension is the same no matter if the rotors are turned on the truck or off... the equipment to turn the rotors on the vehicle were designed for most cars... some of this equipment won't have the power required to turn the rotor, hub and axle of a 4x4...

The business I owned did no repair, we re-manufactured clutches, brakes, air compressor for class 8 trucks as well as turn drums, rotors, grind flywheels. . etc. . As well as industrial friction and what we called light duty started at 1 ton trucks...

But I can share that 90% of the time if the rotor wasn't scored. . we were able to turn it...