[Fot] TR4 Brakes

[fubog1]

 Either the piston is stuck or fluid isn't transferring, the square section o-ring seal between the halves is possibly swollen & the port is blocked.I directly violate the instructions in the book, I split them when rebuilding, & new calipers are so cheap nowadays replacement cost is less than rebuilding them.Another point is that crap builds up in the piston seal groove, & if it isn't all removed the seal may be "tight", restricting piston movement.HTHGlen Efinger
    On Friday, August 29, 2025 at 08:42:11 AM EDT, Michael Moore via Fot <fot at autox.team.net> wrote:   

  
This is for my street TR4,
 
  
 
I rebuilt the front brake calipers with new seals around the puck and dust covers, I did not split them in half. Put them back in, bled the sh** out of them and have no leaks.
 
  
 
But when I press the brakes, only the inside puck is moving, no movement on the outside. My guess is that there is no or very little fluid on the outside half.
 
  
 
Is there a trick to getting the fluid on both sides? Do you think that is my problem?
 
  
 
  
 
Thanks, Mike
 
  
 
62 TR4, Race car
 
63 TR4, Street car
 
  
 
Mike & Becky Moore
 
6050 Ruhl Road, Fairview, PA 16415
 
814-323-0698
 
mmoore at mtmcpafirm.com
 
  
 
  
 
  
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