Guest oakland Posted November 2, 2015 Share Posted November 2, 2015 (edited) I have not driven my 63 Riviera for a while. Took it off the car lift yesterday and noticed the power brake depressed easily and the pedal would not come back after hitting the brakes. I opened up the master cylinder and it looked like it was full of a muddy like fluid. What would cause this? I assume I would have to replace the master cylinder but will I have to replace all brake lines etc? Edited November 4, 2015 by oakland (see edit history) Link to comment Share on other sites More sharing options...
Seafoam65 Posted November 2, 2015 Share Posted November 2, 2015 I assume by Buddy fluid you really mean Muddy fluid. This is what happens to DOT 3 fluid when it sits aroundtoo much and the car is not driven regularly to keep the moisture evaporated out of the system. If I was you I would replace the master cylinder and all 4 wheel cylinders and flush out all the brake lines with solvent and bleed out the brakes with new DOT 4 silicone fluid. Link to comment Share on other sites More sharing options...
68RIVGS Posted November 2, 2015 Share Posted November 2, 2015 (edited) I believe the silicone brake fluid you referred to is DOT 5 Winston ?DOT 4 is compatible with DOT 3 fluid, but with a higher boiling point. Edited November 2, 2015 by 68RIVGS (see edit history) 1 Link to comment Share on other sites More sharing options...
Seafoam65 Posted November 3, 2015 Share Posted November 3, 2015 Correct.....I meant DOT 5. Link to comment Share on other sites More sharing options...
64Riv-King Posted November 14, 2015 Share Posted November 14, 2015 (edited) I had that "muddy" looking fluid in the bottom of my reservoir too. I assume it was the fluid pulling moisture out of the air or just old sludgy fluid. The brakes still worked. Have the system flushed and replaced with new fluid. Edited November 14, 2015 by Sweet64rivi (see edit history) Link to comment Share on other sites More sharing options...
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