Doffer Posted March 1, 2013 Share Posted March 1, 2013 I have a quick question. I am working on a 2003 mack MR688s and the brake pedal is rock hard, not spongy at all like normal air brakes.I've tried to clean the valve, but it doesn't help at all.Is this valve pretty simple to replace? I talked to a mechanic and he said that you should replace the bracket with the valve because the brackets tend to break.What does the valve look like when removed?Mack told me the part was like $60.00, but the mechanic said the valves normally are $200-$300.00 so I may have told him to get me the wrong part?I told him I needed a treadle valve for the brakes. Quote Link to comment Share on other sites More sharing options...
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