Can brake caliper guide pin bosses be replaced, or new Calipers?

[TurnAround]

It occurs to me that one possible source of the steering wheel shudder triggered by 'grab / slip' from uneven deposits at the brakes is that the brake caliper guide pin bosses are worn out, which would allow the caliper to jump back and forth from the uneven deposits.

I'm defining those bosses as: The caliper is attached to the car via riding on guide pins. Whats grabbing the pin is a rubber part mounted to the caliper. It has 5 or 6 concentric rubber 'vanes' inside. Stand to reason.. these would eventually wear out and allow play over the steel guide pins. X has 81k on her.

New slotted and cross drilled rotors and low dust pads on order. I'll have the brake apart anyway. Has anyone experienced or heard of these wearing out and leading to play of the caliper? If so, and you agree its a possible cause, can these bosses be ordered and replaced separately (and under the car without removing the caliper to the bench), or does it require new calipers? If they exist, does anyone have a TIS diagram with part number and proper part name?

Thanks guys.

(Once the new gear is on the car, three months goes by, and the 'shakes' are back, then I'll be meeting with the mechanic to start troubleshooting and replacing more suspension and or steering parts one at a time until the problem is dead. For now, I just have to get the high-dust pads off of there. One issue at a time).

[JCL]

I don't think it is at all likely that this is your problem.

I wouldn't replace the guide pins unless they were obviously worn, and the caliper was moving. If they are seized up, you will have uneven pad wear, that is the tell tale.

Make sure you don't lube them, they are designed to be dry.

[Sundayjumper]

If you want them anyway, part number is 34111157038. They're surprisingly expensive though. Caliper pins need to be removed to get them out of course, but the caliper doesn't need to be disconnected from the brake line.

Not sure if these would contribute to the shaking but IME the pins will be a bit grubby so no harm in cleaning them up with a bit of wire wool & WD40. I've always given them a light coating of grease when reassembling and never had any problems

[TurnAround]

Thanks guys. This helps.

I'll inspect whether the calipers move, once I'm putting the pads on.

Good to know guide pin bosses are field replaceable.

[E55AMG2]

It will help with pedal feel a bit, but wont help with the pulsation.