Diameter of the Mopar JK J8 brake booster?

MOTOWN

MOTOWN

Member
Im trying to get the diameter on th J8 brake booster I got the one tons and 37s on my WJ and it has spongy brakes , anyone who has one know the diameter?
 
There's so much shit in the way that I can't get an accurate measurement. Best guess is around 10" dia.
 
Ddays said:
There's so much shit in the way that I can't get an accurate measurement. Best guess is around 10" dia.
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Thanks , im thinking I may go Hydra-boost for simplicity and i can get a unit with a 1.25" bore to give me the brake psi I need with the one ton bakes , my brake booster is about 9" in diameter and with a 10" or 11" booster I would have to dimple or cut the cowl at the top of the booster for clearance.
 
MOTOWN said:
Thanks , im thinking I may go Hydra-boost for simplicity and i can get a unit with a 1.25" bore to give me the brake psi I need with the one ton bakes , my brake booster is about 9" in diameter and with a 10" or 11" booster I would have to dimple or cut the cowl at the top of the booster for clearance.
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Why would you have to do that? The J8 booster is made to fit the JK's.
 
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