hydro boost question

ah1988ford · Jun 22, 2018

I picked up a hydroboost unit from a 2nd generation Powerstroke and I am having problems trying to figure out what size the first big hole it on the master cylinder the one on the very end, I went to orielys and the small hole on the back of the master cylinder is 1/4 but the front one I can't figure out its almost 1/2 but its too big not 7/16 ethier ideas? trying to convert them to 3/16 to fit my lines i have one figured out.

Macrobb · Jun 22, 2018

Um, if you are using a Super Duty master cylinder with the hydroboost unit, I'm pretty sure they came with 4 wheel disk brakes. You either need to do some sort of mod to it or use a master cylinder designed for disk+drum brakes or it won't work right.

In my experience, using a '04 PSD Hydroboost unit on my '88, the '88 master cylinder "worked"... by modifying the bolt mounting holes and using a bolt+nut on either side. Also, it required a custom spacer to deal with the difference in depth - the "rod" goes further into the '88 MC than the '04.

snicklas · Jun 23, 2018

The 99+ SuperDuty master is metric I think..... I've not had mine apart, but I remember guys having to get creative to marry a SuperDuty (Not F-Superduty) hydroboost to an IDI era truck......

towcat · Jun 23, 2018

*IF* you want a drop-in hydroboost, it needs to be off a 1988 to 1997 F450. anything else requires expensive adapters.

chillman88 · Jun 23, 2018

That does sound like 12mm by the description.

hydro boost question

ah1988ford

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Macrobb

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snicklas

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towcat

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chillman88

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