I have a hard petal that will not stop the car when the vacuum is disconnected and a soft petal going close to the floor when the vacuum is on. On the vacuum it says Bendex 12305 and on the master cylinder it has 1534 and R14. There is no adjustment on the petal rod.I bleed and bleed and bleed the lines so there is no air.
My question is how do you tell if the master cylinder is large enough to service the brake cylinders? I have 6 brake cylinders, 2 on each of the back drums and 1 each on the front. How do I find the right power brake unit to do the job? All brakes are shoes. The unit that is on it when I bought it is a benix 12305 vsacuum and a 1534 or R14 2 cylinder master brake . Petal is soft when applied with vacuum attached but hard with out. Without it will not stop the truck. Help!!