Hi Guys
I hope my information helps and hope you could help me out too.
recently bought a Gary Fisher RS-1 with Pro Stop Brakes at an auction.
View attachment 874982
To my surprise, it came with a bottle of "Pro-Stop Hydraulic Brake Fluid".
So I've did a simple test by dropping water in to
1. SHIMANO HYDRAULIC MINERAL OIL
2. FINISH LINE BRAKE FLUID DOT 5.1
3. PRO-STOP HYDRAULIC BRAKE OIL
Here's what happened.
Pink circle = SHIMANO Mineral Oil
Red circle = PRO-STOP Brake Fluid
Black circle = FINISH LINE DOT 5.1
The drop of water on the oil has no affinity with SHIMANO Mineral and PRO-STOP while Finish Line DOT 5.1 has.
Therefore, I suppose PRO-STOP use Mineral Oil that has no affinity with H2O that is. something similar to SHIMANO.
(well that is if this bottle was not refilled by the last owner... )
What do you think guys?
Lemme know if there should be any other tests that I could try
so we can finally identify the best existing Brake Fluid that matches Pro-Stop Mountain Cycle brakes!