I have a 1952 M38 with v6 231 with 31” tires. It was previously converted to 11” self adjusting drums, front and back with a single chamber master cylinder . When I got the jeep the brakes were scary – no stopping power so I overhauled them completely. New drums, new shoes, new wheel cylinders (1 1/8” bore in front and 15/16” bore in the back), new flex lines in the front, and a new single master cylinder 1 1/8” – brakes were still hard to stop. Swapped the 1 1/8” single master for the 1” single master and I had better stopping power, but the pedal is very hard and it’s difficult to lock up the wheels on gravel. Last winter I changed the 1” bore single master for a 1” bore dual master MC36239 (drum-drum dual – chambers are similar in size) for safety, but I had hoped the stopping might improve. It didn’t. Still have a very hard pedal. No room to install a booster. Thoughts?