I have 1988 Gran villa and wondering if the brake system is driven by a pump on the engine to supply master cylinder with pressure on a hydraulic system.
What chassis do you have ?
It all depends on which chassis you have but if you have hydraulic brakes then probably is a hydra boost system which uses the power steering pump to supply the boost for the brakes.
In an area where you can roll in a straight line and coast to a stop, slacken the power steering belt and test the brakes. High, hard pedal with little to no effect? Hyda-boost off the power steering pump.
Crawl under the driver's side and look up at where the brake pedal comes thru the floor.
If there is a "cylinder" with electrical bayonet connectors then you have a "brake assist" like our '89 GV.
Thanks for the responses I will climb under and look, as far as the chassis manufacturer I will get that info too
If its a Gas front engine, you wont have air brakes.