quick dual diaphragm booster swap question

Working on doing this to my dad's XJ right now. Is there any reason I can't just use the original master cylinder as opposed to having to make the new brake lines and everything? The real reason I ask is one of the fittings on the used MC I bought with the dual diaphragm booster is stuck, stripped the fitting, figured if I can just use the old one it'd save some time and work.

Nope...old master with dual booster no worky... May have to get a new master for the dual diaphram booster... They should only be around 80 bucks at the local parts store... Look into the Madxj.com write up for the master cyl line adapters... best of luck.... You will enjoy the better braking, I know I do....

Scott.

x2

katarn

Why do you guys say the original unit won't work?

The old style master cylinder is too long. If used with a dual diaphragm booster, it would end up in the middle of the windshield washer fluid bottle. The mc used with the dual diapragm booster is much shorter, but the ww bottle still needs to be slid forward a bit on its slotted mount ears.