ratrapp Posted January 20 Share Posted January 20 in my never ending quest to get the 86 road worthy the last piece of the brake system has failed(booster).rock auto showed 1 new booster that said fits 86-87 but if you look at a slightly newer mj it shows a different number but it says fits 86 thru 90 i think.i don't know if theyre interchangable and i really don't feel like doing the 96 xj booster upgrade at this time. Link to comment Share on other sites More sharing options...
Pete M Posted January 22 Share Posted January 22 weird. I thought they were all the same 86-90. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 22 Share Posted January 22 I’ll have to look at my parts books. Cause if they’re different, I’m gonna be in a world of fun on my XJ. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted January 22 Share Posted January 22 A quick search on Rockauto and it lists the same boosters for 84-90 Cherokee and Comanche. Link to comment Share on other sites More sharing options...
ratrapp Posted January 22 Author Share Posted January 22 if you look up a booster for an 86 it shows 5474040 and it says 86-87 but if you look up an 88 it shows 5474071 and says fits 86-90 .i know 86 is like the bastard year for these jeeps.these were the only new ones that it showed.ive replaced every single piece of the brake system on this truck and they were working good and now the booster diaghram ruptured.push the pedal and it goes to the floor and the nice swooshing nice. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted January 22 Share Posted January 22 1 hour ago, ratrapp said: push the pedal and it goes to the floor and the nice swooshing nice. A failed booster will not cause the pedal to go to the floor. That would be your master cylinder. A failed booster makes it harder to push the brake pedal. Cardone does have a different part number for 86 and 88, however Prior and Centric list the same part number. What ever difference that might be there is small enough that it shouldn't matter. Link to comment Share on other sites More sharing options...
Pete M Posted January 22 Share Posted January 22 12 minutes ago, Eagle_SX4 said: A failed booster will not cause the pedal to go to the floor. That would be your master cylinder. A failed booster makes it harder to push the brake pedal. Cardone does have a different part number for 86 and 88, however Prior and Centric list the same part number. What ever difference that might be there is small enough that it shouldn't matter. depends on the circumstances. mine had a stiff pedal with engine off and it went straight to the floor when on. was a bad booster. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted January 22 Share Posted January 22 18 minutes ago, Pete M said: depends on the circumstances. mine had a stiff pedal with engine off and it went straight to the floor when on. was a bad booster. Learning something everyday. Thanks for the clarification. Link to comment Share on other sites More sharing options...
ratrapp Posted January 23 Author Share Posted January 23 yeah ive had to replace the booster on a few vehicles over the years for doing this.its definitely the booster. Link to comment Share on other sites More sharing options...
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