Got bored during COVID19 and installed rear disc brakes on my 70 Challenger. Also received a new Strange Engineering 1 1/8' master cylinder that did not come with pushrod, boot and adapter. I purchased the 2 stud adapter and used the stock pushrod. Result: lot's of pedal travel. Some say to use and adjustable push rod to make up for the adapter plate. What has your experience been when installing these lightweight aluminum master cylinders??? Thanks !

too much travel or pedal height too low?

As said already.. I make my own using a 3/8 pushrod and weld in the end that I need.. no more
than a small amount of slop

For an extra $15, the M/C kit with mounting parts is a deal. It's going to take some fabrication, a threaded pushrod and the right parts/retainers to make sure the pushrod is retained in the master cylinder correctly.

Typically I would cut and thread the original, use a long nut with a couple of jams to create a turnbuckle affair and use the adjustable rod the comes in the kit. You could probably use the two halves of the original and make it adjustable.

Did I say to make sure the retainer has a fresh rubber ring on it and is secure in the master cylinder?

Problem is completely solved!!! I installed Wilwood brakes on all 4. Car stops like a new Corvette now!

Make sure the rod is either held in with urethane or you build a better up stop for the pedal. If the stop lamp switch bends or comes loose the rod backing out of the master cylinder is a real possibility. Had a friend have this happen last year. Crashed the car bad and was injured pretty bad as well.
Doug

Glad it all worked out for you. An inch and an eighth is a pretty big bore MC. Pardon the barrage of questions that follow, but I'm interested. How is the pedal feel with the new set-up? Are the brakes touchy at all? Did you use/add a drum brake distribution block when you swapped in the new discs? Which brakes lock up first during hard braking?

Unfortunately, this is common. Saw a car go off the end of National Trail at the Mopar Nats and get totaled from the pushrod falling out.

Wilwood has a good setup for that. They have a washer that goes on the piston end of the rod and a snap ring that’s holds the washer in the bore. Can’t fall out.