73 Soft Pedal Learning Process

[Steve340]

The pictures were not great but the drums seemed scored and have some weird marks.

 

[Challenger RTA]

The proportion valve does go bad

 

[Ricks72Chlgr440]

Yikes, my 72 Challenger was tough to stop because it had manual brakes with self adjusters.

However, it did stop. The pedal was just high and hard with little feel compared to the regular power brake cars I usually drove.

I am going to bleed but first I am going to see what adjusting my power booster pushrod wil do. It is a brand new booster; I am not sure the shop did the adjustment when they put the MC on. I don't have the tool so I am going to figure out a way to measure the MC bore depth. I want to do this with the MC in the car. At least this will eliminate the possibility this is the issue.

I had an A body car with power brakes that I replaced the MC in. The pedal went almost to the floor before the brakes engaged. I pulled the master away from the booster and lengthened the pushrod. Worked great for a couple of days. As I was driving once after that and applied the brakes the brakes locked up tight. I shortened the rod a little and all was good. Think the master still had some air and the rod was just a bit too short. My experience anyway!

 

[Challenger RTA]

Classic Industries, a rear brake adjustable proportioning valve,

Post a picture of the brake parts that are installed.