Rossi's SS/FA Challenger

CMcAllister · 02-18-2022, 10:36 PM

In the old ,manual brake Mopars, the pushrod had a groove in it that a rubber ring snapped into. The piston in the MC had a receiver groove in it that the ring snapped into to retain the pushrod. There was also a bumper, brake switch, etc, the kept the pedal from coming up too far. Power brake cars didn't use this .

Most of that stuff disappears on a race car and the rubber ring is a one time use deal. New ones are difficult to source and they are a pain to get apart.

There are different types of retainers made by many of the race shops to prevent this by capturing the pushrod and keeping it in the MC. I've even fabricated simple devices to do the job. They allow the MC to be removed and reinstalled without having to deal with the rubber ring, while keeping the pushrod in the piston.. I also like to see a redundant bracket or tab of some sort which is a positive stop for the pedal itself.

I've seen a lot of cars torn up over the year because of this. Simple fix to prevent it..

02-18-2022, 10:36 PM	#26
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 614 Likes: 16 Liked 920 Times in 259 Posts	Re: Rossi's SS/FA Challenger In the old ,manual brake Mopars, the pushrod had a groove in it that a rubber ring snapped into. The piston in the MC had a receiver groove in it that the ring snapped into to retain the pushrod. There was also a bumper, brake switch, etc, the kept the pedal from coming up too far. Power brake cars didn't use this . Most of that stuff disappears on a race car and the rubber ring is a one time use deal. New ones are difficult to source and they are a pain to get apart. There are different types of retainers made by many of the race shops to prevent this by capturing the pushrod and keeping it in the MC. I've even fabricated simple devices to do the job. They allow the MC to be removed and reinstalled without having to deal with the rubber ring, while keeping the pushrod in the piston.. I also like to see a redundant bracket or tab of some sort which is a positive stop for the pedal itself. I've seen a lot of cars torn up over the year because of this. Simple fix to prevent it.. Last edited by CMcAllister; 02-18-2022 at 10:39 PM.