Brake emergency

You cannot afford to "think" your hoses are ok!
Ok. I think that you dont understand about flex hoses and how they go bad. They may look fine on the outside. But they rot from the inside, out. What often happens, is the brake fluid goes out to the WC but on its way back, it seems to slam a rotted rubber flapper down to act as a checkvalve. Sometimes it bleeds back to the M/C: It might take a minute or an hour or overnight. Sometimes a soft apply and a gentle release, will shuttle the checkvalve, and allow the fluid to return.
If you cant say that the hoses have been replaced in the last 3 to 5 years, I would strongly, VERY strongly, urge you to replace them on your SINGLE chambered system. If any single hose fails on your system, you are in the wall!
When you put new shoes in there, the W/C cups/pistons/pushrods all have to be pushed back into their bores; usually right on top of where the rust accumulates. Shortly afterwards, they leak. All over your brand new shoes. The W/Cs should,at the very least,all be opened up and inspected. If any single cup turns sideways in its bore,because it stuck on some rust on its way back, you are in the wall!
There are no places to cut corners, on a single chambered system.
The 9 inch system is marginal at best.
Do it right or pay someone to do it right.
I am not being an a$$. Your life, and the lives of everyone around your car may depend on all 4 of those Wheel cylinders doing their jobs.You cannot afford even just one piece failing.