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Old 11-25-2021, 03:25 PM   #1
grubsster
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Leaking master cylinder cap.

Hi all, I have a '66 C10 with a leaking master cylinder cap. It is not over full. For some reason all the fluid came out the rear port. This is a new master that got all ugly from the fluid. I refilled and bled. Now I see why it is getting emptied. Has anyone else had this problem? Any ideas? Thanks in advance...
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Old 11-25-2021, 04:22 PM   #2
MySons68C20
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Re: Leaking master cylinder cap.

New cap and rubber gasket? Tightening the wire hold downs is a pain but took care of the leak on my cap.
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Old 11-25-2021, 08:38 PM   #3
cwcarpenter98
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Re: Leaking master cylinder cap.

I have a similar master. I went a couple years of driving before checking the fluid again. When I did that, a little bit of crustiness had built up on the seal. When I put the cap back on, I noticed that it started leaking. Took it off again, cleaned the crustiness off the rubber on both sides, then took a razor blade to the sealing side on the master to make sure it was clean and flat. I haven't had a leak since doing that
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1963 C10 - Frankentruck 283, 3 speed with overdrive
Overdrive wiring here
1995 Dodge Dakota Sport

"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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Old 11-26-2021, 12:58 AM   #4
pjmoreland
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Re: Leaking master cylinder cap.

I installed a new master cylinder last year that is the same style as yours, and the cover leaked right from the beginning. I ordered a MCAK012 cover from opgi.com, and it hasn't leaked since. This cover is overpriced, but it did solve the problem.

https://www.opgi.com/brake-systems/m...l-mcak012.html
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Old Yesterday, 06:51 PM   #5
grubsster
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Re: Leaking master cylinder cap.

Thanks all, new cap, gasket and tightened the hold downs. No more leak!
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Old Yesterday, 11:30 PM   #6
MySons68C20
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Thumbs up Re: Leaking master cylinder cap.

Right on!!
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