http://auto-recalls.justia.com GMC:C30:1977 Recalls http://auto-recalls.justia.com/content/77V119000-GMC-C30-1977.html ON THE INVOLVED VEHICLES, THE NUTS WHICH ATTACH THE BRAKE MASTER CYLINDER TO THE HYDRO-BOOST UNIT MAY HAVE BEEN OVER-TIGHTENED. THIS COULD HAVE CAUSED STRIPPED THREADS AND CRACKED ATTACHING FLANGES. SHOULD THESE NUTS FAIL, THE PARTS MAY SEPARATE AND LOSS OF SERVICE BRAKES WOULD RESULT. Fri, 12 Oct 1979 00:00:01 EST