e9500v8
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Everything posted by e9500v8
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Take the supply line off the park brake valve and see how good the flow of air is I bet you have a air restriction to the park brake valve!!
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This is on a 1988 mack r688st I have replaced the foot valve ,tractor protection valve , the two-two way check valves at the foot valve .This thing is driving me nuts if I push brake pedal lights will stay on for a long time till air leaks off .I am an ASE certified diesel mech I have worked on macks for 15 years and this one is killin me . Aside of replacing all the valves on the truck I am at a loss any help would be great.
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Try IB diesel in pennsylvania . They have done a few of them for guys I know and do an excellent job .Or try Michigan turbo I have personally had very good luck with them and they are very knowlegeable. Good luck when you get a good one let me know cause I would like to buy one myself!!
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In low gear your ratio is 23.08 to 1 and the over drive in the 12 speed is .78 pretty fast!!
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On your rearend on top right on the sloped part below the breather there is a flat place clean it all off the gear ratio will be there probly 4.17 or 4.42 or 4.64 rarely could be 5.13 .For the transmission there is a flat place on one side or the other that has the numbers stamped in it also. I have the identical truck but i replace the 12 speed mack with a 13 speed fuller !! I just use gear oil the check plug is on the right side rear it is usually a square headed plug ,they hold about 4 or 5 gallon.You fill the oil up till it comes out the check plug!!
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pretty sure it was 1999
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right under the injection pump !!
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