Master cylinder: 2-bolt vs 4-bolt. Are they the same size? (2 Viewers)

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Aug 5, 2014
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Orange, CA
My 1991 HDJ81 has a 4-Bolt master cylinder and brake booster that needs replacing. I'd like to swap them to the newer model 2-Bolt master / booster since parts availability and pricing is much better. Also, having a 2-bolt master cylinder will make me that much more ready to swap in a Marks 4WD hydro boost kit down the line...

I know the 2-bolt master and booster will mount up just fine in the engine bay, but im wondering if the hard brake lines will still line up with the master? Are the dimensions the same as the 4-bolt or will I need to make some adjustment so the lines line up?
 

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