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Reply to "Brake master cylinder"

Update.....

First, who was the idiot that put Allen bolts on a master cylinder....? Since I was at my "other" garage with limited tools, it took me a while to find a bit to fit.....normally not an issue, where a 9/16" headed bolt should have sufficed.....or proper studs and a nut..... If I had cause to remove this in the field....I'd still be beating it with rocks and sticks!

N.B. Hit Fastenal up for proper two sided studs.

OK, back to point....
Pulled this unit off and benched it yesterday for inspection. It is indeed the E2TA casting (number is on the bottom) with a 15/16" bore. (Dorman #MC39388)

Turns out it was absolutely clean on the inside bore area. Slight polishing where seals ride, but that is to be expected. Reservoir areas had some sediment buildup but over all, nothing pointing at this as the cause to "seemingly hanging" brakes. Could be rust on the rotors....

But, for my sanity's sake, will be next popping off the calipers to inspect.

I did find out that this unit did not have the residual pressure device/obstruction in the rear brake fitting which you would expect to find in a unit designated for front discs/rear drums. How you ask? Once I had the pistons out (there are two parts!) I simply shined a light into the bore and looked thru the output port holes! Saw nothing but light! Cool! Don't need to mess with that.....!

Cleaned things up with brake cleaner, lubed seals and bore with brake snot (Brake Assembly Lube!) and popped it back together.

Don't touch that dial! Tune in again next time!

Steve
Last edited by mangusta
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