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The metal braces on the rear calipers and body are for rear impact control !
helps accordion the body metal outwards away fron passengers inside. Brake fluid flushes every 30K helps to prevent caliper piston freeze ups, as well as premature master cylinder leakage. Dot 4 recommended ! Brake pads and shims
receive a light coat of Volvo synthetic paste part # 1161037 after a caliper fitment check ( aftermarket pads may need slight dressing on contact edges)
where they ride on the caliper body , top & bottom ! the same paste goes on the mounting pins after they've been cleaned up on a wire wheel. Again if using after market pads make sure they have a 45 degree bevel on the leading and
trailing edges. Inspect the rotors and clean off excessive rust. BG makes a product called "stop squeal" basicly graphite with and alcohol carrier. This is applied sparingly to the pad surface and rubed in and allowed to dry prior to instalation. I'm sure they're other manufacturers out there check with your local parts store or ask the dealer when picking up the paste.
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