{"id":17030,"date":"2022-11-18T14:01:28","date_gmt":"2022-11-18T19:01:28","guid":{"rendered":"https:\/\/gm-techlink.com\/?p=17030"},"modified":"2022-11-18T14:01:45","modified_gmt":"2022-11-18T19:01:45","slug":"park-brake-will-not-learn-after-rear-brake-service","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=17030","title":{"rendered":"Park Brake Will Not Learn After Rear Brake Service"},"content":{"rendered":"<p style=\"font-weight: 400;\">Some 2018-2023 Equinox and Terrain models may have DTC C0561 43 (System Disabled Information Stored \u2013 EEPROM Incorrect Programming) set and the park brake will not learn after rear brake service has been performed. DTC C0561\u200943 indicates that the park brake actuators position is unknown. A Service Park Brake message also may be displayed on the Driver Information Center.<\/p>\n<p style=\"font-weight: 400;\">These conditions may occur if the first steps in the rear brake service instructions are not followed. Refer to the Rear Disc Brake Pads Replacement procedure in the appropriate Service Information to ensure that all service procedures are being completed properly.<\/p>\n<p style=\"font-weight: 400;\">The service procedure instructs to check the fluid level in the brake master cylinder reservoir. (Fig. 13) The brake fluid level in the master cylinder reservoir must be at 1\/2 or lower between the maximum\/full point and the minimum level to allow sufficient space for the fluid to return to the reservoir when the rear caliper retract is commanded. If the fluid level is higher than 1\/2, brake fluid should be removed before continuing with repairs.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-weight: 400; text-align: center;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-17010\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F13-brake-2.png\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F13-brake-2.png 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F13-brake-2-300x195.png 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F13-brake-2-85x55.png 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F13-brake-2-200x130.png 200w\" sizes=\"(max-width: 740px) 100vw, 740px\" \/><strong>Fig. 13<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-weight: 400;\">The caliper will retract when commanded but will stop when the reservoir is full. If there is too much fluid in the reservoir, the piston will not be fully retracted into the caliper. (Fig. 14)<\/p>\n<p style=\"font-weight: 400;\">If this occurs and then the piston is manually pressed in the rest of the way so that the caliper can be reinstalled, the excess fluid pressure will damage the pressure sensor(s) in the Electronic Brake Control Module (EBCM).<\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-weight: 400; text-align: center;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-17011\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F14-brake-1.png\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F14-brake-1.png 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F14-brake-1-300x195.png 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F14-brake-1-85x55.png 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2022\/11\/F14-brake-1-200x130.png 200w\" sizes=\"(max-width: 740px) 100vw, 740px\" \/><strong>Fig. 14<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-weight: 400;\">Typically, the park brake data for one or both of the pressure sensors will show the default value of 14,400 NM. If a pressure sensor(s) is damaged, it will be necessary to replace the EBCM. Due to the nature of this damage, EBCM replacement is not a warrantable repair.<\/p>\n<p style=\"font-weight: 400;\">For more information, refer to #PIT5953.<\/p>\n<p style=\"font-weight: 400;\"><em>&#8211; Thanks to Ken Cole<\/em><\/p>\n<p style=\"font-weight: 400;\">\n","protected":false},"excerpt":{"rendered":"<p>Some 2018-2023 Equinox and Terrain models may have DTC C0561 43 (System Disabled Information Stored \u2013 EEPROM Incorrect Programming) set and the park brake will not learn after rear brake [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[131],"tags":[],"class_list":["post-17030","post","type-post","status-publish","format-standard","hentry","category-2022-november-b"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17030"}],"version-history":[{"count":2,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17030\/revisions"}],"predecessor-version":[{"id":17032,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/17030\/revisions\/17032"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}