Though my right hand caliper works fine, the left caliper has seized. Is this unit serviceable, or must I replace the whole thing?
hiya,and welcome to the forum.Though my right hand caliper works fine, the left caliper has seized. Is this unit serviceable, or must I replace the whole thing?
Kero & diesel will work if that's all you have. I use PB Blaster because it's made to dissolve corrosion, remove the outer dust boot, fittings and lines to allow for good penetration. Drain the existing brake fluid and squirt some PB right in the bleed nipple and where the line comes in. My piston popped right out with the available pressure from the MC. Do a bleed and keep the MC topped off during the process. The whole process is a bit messy, but no matter coz you're going to have to do a full cleanup on re-install. Using air pressure is a bit risky. Too many things can go wrong.
From a previous post: Seized Caliper Post
Although my ride is an '80 with the single piston I was faced with a similar situation. There was so much white corrosion inside the dust boot I probably should have not bothered, but I did anyway. First I pulled the incoming line and loaded the chamber with PB Blaster as well as PB'd the front side of the piston. Then I microwaved a damp towel until it was to hot to handle, wrapped the hot towel around the caliper, repeated this a dozen times over the course of the day, bleed the system and pumped out the piston. It's pitted and most likely shot, but it did come out.