I have a 68 Stepside with manual brakes with drums. Wanting to put in a brake booster to help with braking.
Two questions? (1) does it matter what size booster I put in (9" or 11") and if need straight mounting bracket or angled bracket; (2) do I need an original proportional valve or can I use one that has the knob to adjust. I'm not really looking to keep it original, but just want to have better braking.
Thanks for any help!