ajhswan

Fixed Subaru dragging brake Calliper I had a similar issue to this and have come up with a solution I have not found mentioned elsewhere; Thought I would share, as it would have saved me a lot of time, pain and money had it been out there before; The cause of the drag turned out to be over-lubrication of the calliper slide pin that has the anti-rattle rubber on it. The drag was so severe that I had smoke coming out of one front wheel from the burning hot rotor, which got so hot I seared 3 fingers touching it momentarily. I had noticed, when I was rebuilding the calliper, that the slide pins were pretty dry so I added lube and a bit of silicone spray. This made them move very nicely, but I realised later that it allowed the one with the rubber on the shaft to seal so it had trapped air below the pin that tends to force the pin back out of the hole. The effect is that it puts a lot of pressure on the outer disk pad as it is forcing the mobile part of the calliper mounting away from the pin towards the centre of the car. The solution is to clean all the lubricant, gunk etc out of the hole in the calliper then place a minimal amount of brake lube grease on the shaft. Check the anti-rattle rubber to make sure it has not swollen as this will cause the problem as it will seal in the bore of the calliper slide; You may need to get a new rubber if this has happened; The rubber I had had 2 flat sections to allow air movement, but these were not evident on the old one, but I suspect that was swell from the grease and maybe the silicone. I will be monitoring and may need to groove the shaft or the rubber to ensure it does not jam up.