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Old 12-09-2014, 12:51 PM   #1
SCOTI
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,064
Brake Hydraulic Issue

So..... last night I'm looking at/comparing the driver side upper arms (my modified OE unit, PB's, & the flat plate/ MMW ones) when I noticed something under the hood of my 89 CC dually.

The newest/latest master cylinder that I've installed is leaking in the same spot as the previous units. Brake fluid has f'd the paint on the booster yet again & you can see where its dripped down below. The leaks are coming from where the 'pin' pushes the plunger into the MC.

This is the 3rd time for this so something isn't right. I changed over from a Hydra-boost set-up to vacuum assist. I sourced parts based off a 3/4 ton suburban vac assist set-up.

The master cylinders were 2 different oreillys units: 1 reman & the other was a 'new' Brakebest/house brand. The current unit is a new Wagner model. They're not leaking from the lines. Anyone else had failures internally that seeped out where the piston/plunger enter the MC??
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
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