This may sound crazy but I'm having a hard time finding the brake fluid reservoir on my '55 super 88.

 

Its next to the steering column in the engine bay down low there is a small screw on cap on a tube sticking up from the reservoir its mounted on the front of the power brake cannister. Use a flashlight its there

 

Not only is it hard to find its almost impossible to fill. If you have it on a hoist you can see it easily.

 

It's right there, under your feet ...I fill mine on a '57 with a small plastic brake fluid bottle, about six ounces that I bought in Lansing and I just refill it when I need to top up my '57 brake fluid The top part of that screw in rod has two small holes that are air vents...so make sure they are cleaned out

 

Ekamn, It is at the bottom of the steering wheel column on a 55 and I fill mine with a plastic bottle that you use to put ketchup on your fries at the local burger place. If I can find it I add a little plastic tube that makes it easier still ....Tedd