Rossi's SS/FA Challenger

[Dave Gantz]

Originally Posted by jmcarter

The ole master cylinder rod which hope everyone learned from.

This maybe should be brought up again. I have no knowledge of the Etter incident, but I know it happened on occasion to different cars. It was because the m/c pushrod would fall out if the brake pedal was inadvertently lifted a bit.
I don't remember what caused it. Was it something to do with converting to manual brakes?

[CMcAllister]

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..

[GTX JOHN]

Paul Rossi has been helping us the last Couple
of days at the Winternationals. A million stories
and lots of sage advise!
Must be working as we both have made it
to final 4 in Stock (Me) and SS (Jon).

[bigshow2966]

Originally Posted by CMcAllister

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..

My Valiant has a slotted "L" bracket where the brake light switch used to be. Weighs a couple ounces and takes a few seconds to adjust. Good insurance for sure. I hate crashing.

[herbjr]

Originally Posted by bigshow2966

My Valiant has a slotted "L" bracket where the brake light switch used to be. Weighs a couple ounces and takes a few seconds to adjust. Good insurance for sure. I hate crashing.

Exactly, most of these that came out was the builder being careless and not putting a stop up. This was a huge pet peeve with my dad.

Herb Jr

[4406mopar]

Here is a source for the brake pushrod retainer. This is also a great source for rear end and disc brake parts, look it over.

https://www.doctordiff.com/manual-br...r-grommet.html