M/C brake rod removal

[69roadr]

getting a new master cylinder for the Roadrunner today, but before going any farther, i need to get the brake push rod out of the m/c valve assembly. how is it held in there? how can it be removed?
thank you,
Greg

 

[RestifiedBee]

It's should just come straight out. It's just stuck after years together.

 

[miller]

Yeah. Should be a ball-shaped end on the rod. If I remember right, that end is forced into a rubber sleeve, that's fit into that end of the piston. It's simply there for positive movement. A little tough, but should pull apart.

 

[69roadr]

well, with the help of my floor jack and putting a large screwdriver through the eye of the brake rod, a couple of pumps on the jack and it came off. this would be extremely difficult to do by hand.

 

[69roadr]

here's a pic of the setup for anyone else looking to pull the rod out alone.

 

[NOSTRT980]

all I use is an ice pick to slit the rubber grommet. then pull it apart. but your way is easier.

 

[Meep-Meep]

That rubber grommet is unbelievably difficult to remove but glad you had a clever solution. Reason is the square edges of the grommet land in a square groove in the piston.

 

[The Horvaths]

A little thin silicone oil or spray would only help. Unless you got it on your grip surfaces!

 

[coloradodave]

Ingenious solution. Good for you...

 

[SublimeSixpack]

here's a pic of the setup for anyone else looking to pull the rod out alone.View attachment 249134

I'd say that's outside of the box thinking. Clever!

 

[Meep-Meep]

I had an opportunity to use this method today and of course it worked like a charm. One slight modification is I took the swivel plate off my jack and the push rod went right through the hole and that pad for the swivel plate gave the MC a nice place to sit. Brilliant!

 

[A383Wing]

put the pedal rod in a vise and tighten down, leave enough room under the piston to get a couple large screwdrivers in there and pry up....easy

 

[Bigal75]

Yep, that happened to me when pulling on the rod under the dash - of course the fluid came pouring in afterwards...

 

[vitamin c]

Yep, that happened to me when pulling on the rod under the dash - of course the fluid came pouring in afterwards...

yea, I made that mistake once. I pulled on the brake pedal and ended up bending the flimsy tab on the back of the M/C pulling the whole piston out onto the new carpet. woops!

 

[A383Wing]

the little rubber piece is nothing special....I just used a small piece of vacuum hose on mine....I experimented with different sizes before I found one that worked good....

 

[vitamin c]

the little rubber piece is nothing special....I just used a small piece of vacuum hose on mine....I experimented with different sizes before I found one that worked good....

Id have to argue that its nothing special. If that rod falls out of the M/C going down the road, your up **** creek!

 

[A383Wing]

I meant it's not that hard to get one...just a piece of rubber hose

 

[diesel_lv]

I know, ancient thread, but this helped me greatly. I've removed many master cylinders and never had a rod stuck in one. I kept trying to figure out how to get it out. A thank you to the original poster.