Dual Master Cylinder - bore depth
My 65 C20 had drum/drum manual brakes with the single pot master, so figured I"d swap for a dual and bought a 67 C20 master with a 1 1/8" bore. I bought a 7" dual booster off ebay so I could keep the air cleaner on my 230 I6. It took over a month to get the booster (don't ask) so I got bored and ran the lines and installed the master cylinder. Booster finally showed up, and I learned that there are both shallow and deep bore master cylinders. Mine is deep, but the booster is meant for a shallow.
I see there are spacer plugs that are expensive and take a long time to get here, and since my master requires a wrench to pop the cap on, I'd sorta just like to replace the whole master if I can get one from oreillys for $30. What master do I need? Running a 1 1/8 master without a booster isn't ideal... Thanks! |
Re: Dual Master Cylinder - bore depth
I think this will answer your question - http://67-72chevytrucks.com/vboard/s...d.php?t=627904
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Re: Dual Master Cylinder - bore depth
I already have that master cylinder (with the deep bore), but the intermediate pushrod is not the right length. I need a drum-drum 1 1/8 master cylinder with a shallow bore, but don't know what "application" to look for.
Or if someone has a deep to shallow spacer they'd be willing to sell me cheap... |
Re: Dual Master Cylinder - bore depth
Recommend go to local parts store (so you can confirm visually before paying) - ask for a 67-70 C20 Power Brake mc. You still may not get what you want, some of the minor deltas in power vs manual mc part numbers seem to have somewhat faded over the years and some folks have problems finding what they need. But the key is to search in the window after the dual pot was mandated and before disks came out - and specifically for a 3/4 ton WITH power brakes from the factory. Let us know what you find and good luck!
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Re: Dual Master Cylinder - bore depth
I didn't try really hard because I didn't want to break my brake booster, but I couldn't get the intermediate rod out. Is there a trick to it?
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