Ok was planning on doing front brakes on my 89 GMC 1ton 4x4 today. So
the other day I read up in my factory service manual, looks like an
easy job, so I get all the parts, and today I get to work. Well, the
service man didn't tell me but it looks like the rotors are press fit?
or otherwise bolted? I took the wheel adapter off(it's a dually). Get
the caliper off no prob.
Cannot get the rotor off. Is the manual this far off? Anyone do brakes
on one of these before? I threw a dial indicator on the rotors for the
fun of it, and the worse one is only .005" out. But I def have a
pulsate when stopping. How do I get these rotors off? My dad has a
press.... do I need to take the whole hub assembly off? Is it likely
that anything other than the rotors could cause my pulsation?
The front rotors on the 1 ton is backward mounted, meaning, you
have to remove the hub, drive out the wheel studs and then drive
the rotor off the back side of the hub.
Strongly recommend new wheel studs on re-assembly.
The rotor and hub come off together, and then get chucked up
on a brake lathe as an assy. Or the rotor can be turned with an "on the
vehicle" brake lathe. If the rotor has to be replaced the studs have to
then the rotor can be removed. Always use new studs on assembly, and then
it up on a lathe and check the run out., if it out, turn it. welcome to the
world of bigger trucks. I prefer the off the vehicle method, the bearings
should be repacked, and the forgotten bearing and seal inspected, repacked
or replaced, ie the inner spindle bearing and seal that can only be gotten
to by removing the spindle assy after the rotor and hub assembly is removed.
Mark the alignment of the spindle to the knuckle, and be mindful of any shim
that may be between the two pieces, it needs to go back on as it came off.
NAPA has a "tool" that will thread on the spindle and allow the use of a
to lube the bearing. its not the best way, but better than no lube at all.
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