hardknocks Posted September 18 Posted September 18 Has anybody changed the mastercylinder and put a mastercylinder and brake booster from a newer truck and got rid of the hydrovac. Also made it a two brake system instead of one. Ive looked into a air over hydraulic but it uses one mastercylinder for all 4 brakes. I have air already on truck since the tag axle has air brakes and air bags. Quote
acem Posted September 18 Posted September 18 School buses often had dual brake systems. The parts are probably available but it would be a job. It's also possible to convert to Air Brakes. My 1850 parts truck has air brakes. Ive also seen hydraulic and air brakes on the same truck. Quote
hardknocks Posted September 18 Author Posted September 18 Ive got hydraulic on 2 axles and the 3rd has air brakes. What year school buses. And where they vaccumm operated Quote
acem Posted September 18 Posted September 18 I'm not sure what years but I've seen Loadstar and other busses from the 60s and 70s with the twin hydraulic system. If I remember correctly, they have two lines going to each wheel. Each brake has two cylinders. One line to each cylinder. So if either system fails, all wheels have some brakes. Here's an old post with some pics. Quote
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