1980 m20 J brake Master Cylinder

[rturbett]

The previous owner replace the brake master cylinders. The originals we not kept.  The ones put in changed the angle of the pedals, and it makes it very difficult to press on a rudder pedal without activating the brakes.

I have five options-

1- try to get used to it, and do daily calf stretching exercises that will let me curl my toes up. Contact the Keebler elves for possible guidance.

2- wear heels....... high heels. Not my thing.

3-Add blocks to the bottom of the rudder pedals

4- find a mechanic that may be able to re-drill mounting holes, getting the alignment right

5- find a set of the originals and have them rebuilt, and put the right equipment in the airplane.

 

I would appreciate this groups help with number 5-  are there any best sources for salvage parts you could recommend?

Thanks,

Rob

 

 

 

 

[Aerodon]

I have a set of Cleveland brake master cylinders for you.  The rod ends are adjustable, nothing else is.  Sounds like you got an installation error?

 

Aerodon

[PT20J]

1. Remove the left exhaust cavity. 

2. Check if the brake cylinder rods are adjustable (if the correct master cylinders were installed, they should be on a M20J). 

3. Adjust them. 

[rturbett]

20 hours ago, PT20J said:

1. Remove the left exhaust cavity. 

2. Check if the brake cylinder rods are adjustable (if the correct master cylinders were installed, they should be on a M20J). 

3. Adjust them. 

PT20J,  I searched for schematics  and came up empty.   How would the rods be adjustable?

Thanks,

Rob

[Fly Boomer]

2 minutes ago, rturbett said:

PT20J,  I searched for schematics  and came up empty.   How would the rods be adjustable?

Thanks,

Rob

Putting @ in front of his handle like this @PT20J lets him know you have a follow-up question.

[A64Pilot]

Do you have pedal extenders? If so that might be part of the issue

[Pinecone]

If your rods are not adjustable, the adjustable links are available.

I managed to get one from LASAR and one from the factory (ordered through Maxwell).

The one from LASAR (about Sept 2022) was around $300.  The one from the factory was about $600.   If I needed them again, I would do an owner produced part, they are not complicated.

 

[PT20J]

31 minutes ago, rturbett said:

PT20J,  I searched for schematics  and came up empty.   How would the rods be adjustable?

Thanks,

Rob

The rods are threaded and can be adjusted by loosening a locknut and turning the rod. When you remove the panel and expose them from underneath it will be easy to see how it works. The adjustment is not described in the service manual.

Installing 1.5” pedal extensions doesn’t change the pedal angle, but the 3” extensions tip the pedals aft. But, since you mentioned that your master cylinders were replaced it’s likely that they were just not set correctly.

 

[rturbett]

Thank you- 

The previous owner said that the stock (correct ) ones were not available when they were replaced.  

I'm hoping we find that the ones installed have a threaded adjustment.

Rob