Truck is in the shop getting some R&R.
First thing was brakes. I always noticed a slight steering to one side when braking and engine temps a bit higher than normal some times.
I start taking apart the caliper, to find out 2 pistons seized, they wouldn't retract, not even clamping them in! The other 2 worked wonderfully.
So I had to use an air compressor to blow the pistons out, and on the stubborn ones I had to re-insert the piston that blew out and support it on a metal block just high enough that when weight is applied, it'll force the seized one out, but at 150 PSI, you'd think it would budge, this is not what happened! Instead it just kept blowing the already blown out piston "out" again.
A few tempered faces, finally got those bastards out! And to my surprise, the reason they seized is because the o-ring inside the piston chamber slowly starts shifting up/down enough to move the piston slightly cock-eyed, and results in uneven extrusion causing the outside seal to lift around the ring of the piston enough that foreign matter enters into the chamber. Over time, this cycle eventually renders the piston useless as it can no longer retract due to build up around the tip and mid-way, and eventually starts settling against the rotor enough you can't turn it by hand so easily.
All this ends up in a rebuild, $200 per side. Requires 2 kits per caliper (each kit has 2 pistons/2 o-rings/2-seals) OEM new here is $835, and unless it was broken like FUBAR, than yes!
Hopefully, the driver side is alright, but I got a bad feeling...
First thing was brakes. I always noticed a slight steering to one side when braking and engine temps a bit higher than normal some times.
I start taking apart the caliper, to find out 2 pistons seized, they wouldn't retract, not even clamping them in! The other 2 worked wonderfully.
So I had to use an air compressor to blow the pistons out, and on the stubborn ones I had to re-insert the piston that blew out and support it on a metal block just high enough that when weight is applied, it'll force the seized one out, but at 150 PSI, you'd think it would budge, this is not what happened! Instead it just kept blowing the already blown out piston "out" again.
A few tempered faces, finally got those bastards out! And to my surprise, the reason they seized is because the o-ring inside the piston chamber slowly starts shifting up/down enough to move the piston slightly cock-eyed, and results in uneven extrusion causing the outside seal to lift around the ring of the piston enough that foreign matter enters into the chamber. Over time, this cycle eventually renders the piston useless as it can no longer retract due to build up around the tip and mid-way, and eventually starts settling against the rotor enough you can't turn it by hand so easily.
All this ends up in a rebuild, $200 per side. Requires 2 kits per caliper (each kit has 2 pistons/2 o-rings/2-seals) OEM new here is $835, and unless it was broken like FUBAR, than yes!
Hopefully, the driver side is alright, but I got a bad feeling...
