I found a kit for the original AISIN master so I reconditioned and refitted that one at the same time as I overhauled my booster.
Yeah. I wanted to get the low-level warning light operational again ... But regardless of that, I am always fond of running original ex-factory components...
Yep. I ran this PBR master for years on my BJ40 and had no complaints about the quality:
And here is the original AISIN:
The only difference I could see is that the PBR had completely separate reservoirs whereas the AISIN used two separate chambers within the same reservoir...