Remove the retaining clips on the calipers. Remove the plastic dust cover for the caliper bolts and you will need a 7mm allen wrench to remove the caliper bolts. Push in the caliper pistons. NOTE: you will find the rear brake caliper lower caliper bolt very tight to get into and hard to get a tool in there? So you may be removing that bolt with slow turns and frustration. What I normally do is remove the whole caliper with the bracket by removing the 13mm caliper bracket bolts. But doing this can make it very tricky trying to get the brake pads back in? Maybe once you remove the caliper with bracket assembly you can remove the bracket off and install the pads and then slide everything back together again over the rotor and bolt up? Also when pushing the piston back in, do not open up the bleed valves on the calipers. You could get air in the brake system. Also clean the caliper bracket contact points and lube the contact points on the brake pads. On the front outer brake pads, lube the top of the pad as well. This XC90's have being making a metalic popping noise because there is no lubrication to let them slide properly so the pads bind up. Also lube the caliper bolts as well to allow proper movement. If there is no lube, the bolts could bind up causing uneven wear on the pads. Hope this helps.
Sunday, March 21st, 2010 AT 4:55 PM