2004 HR scepter, the front brakes like to lock up hard if you have to use ter brakes very hard. dry ground or wet they will lock and slide quickly.... any ideas on what to look at first? Maybe just ...
Could be a defective relay valve not releasing or operating slowly. ?? Maybe a kinked air hose. ?? With MH stopped, press hard on brake peddle then release and listen for the air to exhaust. Is it instant or time release? I've worked on hundreds of air brakes on semi's but got out of it before disc came out so I'm guessing a lot. It should have standard generic air brake parts available at large truck parts stores.