Rear brake issues

[dgmontoya]

Ok i am having a frustrationg problem on my Busa. the rear brake keeps losing pressure after it sits in the garage for a day or two. i can pump it up to regain some pressure but when it sits it loses it again. i have bled and re-bled and rechecked all fitting and looked for leaks. all stock except for braided line. anyone have this same issue or seen it before. i am starting to wonder if it is the master. i haven't noticed the fluid level change much either. thank in advance for any help

 

[Tufbusa]

If you have no leaks, it's the master cycinder. The oil is weeping past the piston. Would be my guess?

 

[mike1180]

There are 2 bleed screws on the rear caliper (if it is a gen 1)
If you don't bleed both, then you can have air in the system.

 

[dgmontoya]

it is gen 1. where is the second and how is the bleed performed
Posted via Mobile Device

 

[mike1180]

One is on the front side, and the second is around back.
It is a little hard to get to.
I use a piece of clear tubing as a drain so it doesn't spray on the wheel.
You bleed one then the other and go back and forth a couple of times.
Let us know if that was it.

 

[mike1180]

Here:

 

[dgmontoya]

man you guys are the greatest. everytime very helpful. i will try that this weekend.

 

[Big D]

Here:

...yet another example of why I love this forum.

D