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86 mj brake booster differences


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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.

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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.

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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. 

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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. :(

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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.

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