So, challenge car needs a different clutch master.
Must be 7/8 bore, or slightly bigger.
Must have a flare fitting for the line.
Metric or standard or bubble or inverted female flare doesn't matter. Im equipped for all.
Must fit a flat firewall, so 90 degree-ish mounting surface
Must be cheap. Im hoping to beat 49.99 by a LOT.
junkyards are cool.
So, what do we have/options are there?
This is literally the only thing kerping me from test driveing and starting to shake it down....
Look to GM intermediate cars from the 70s/80s. Earlier ones I think were 7/8" and later ones were metric but very similar in bore size, they just measured it in MM.... but I could be misremembering and they are 1"
Last one I bought from an undercar wholesaler was $29.
Vega, Monza, and manual-brake vette's from the 70s used a 7/8" bore
80s Dodge K-cars used 7/8". Be cautious that they have a pretty short stroke, so volume may be an issue.
65-67 Mustang manual brakes were 7/8" but that is a single
80s Ford intermediates (like Fairmont) used a 7/8"
83-87 Chevettes used 7/8"
Edit..... nevermind. You need a clutch master. I was thinking brakes.
early sprites are that size, but the cheapest moss has is $70 They arent the most reliable, but you would get two bores out of one master (both in one unit, clutch and brake, same bore)
In reply to Curtis :
I actually looked at a couple of single reservoir brake masters, but they will bot clear the space i have. Which sucks, because theres one for 22 bucks at the flaps....
You can buy a bare tilton from summit for $63 but then you'll need to find someone with the reservoirs laying around. (I think i have the left overs of a few "Kits")
I think the '87-94 Cavalier Master Cylinders were around that size.
'94 S-10 w/ 4.3 used a 13/16" slave, RockAuto shows the cheapest version for $21.79
Grant
7/8" bore I can find under $20 on RockAuto:
88 Ford Bronco, $15.76
DORMAN CM640046 for 2002 Civic (appears to be the wrong bore, hooray for Dorman berkeleying up?) $17.65
AUTOSPECIALTY/KELSEY-HAYES Q85007 for 1989 E150 $11.82
Edit: I also have a box of random racing brake cylinders and stuff at home, I can go through that for you if you want.
Ok, i must be missing something. Tge roll pin the pictures denotes a special fitting, right? Or is there a way to tap to npt and use a brake flare fitting adapter?
Ot am i just dense?
In reply to Dusterbd13-michael :
The plastic master cylinders do tend to have weird plastic line connectors, yeah. Not sure about the viability of tapping for a regular fitting. I think the Civic MC I posted has a real flare fitting though. I'm going to keep looking.
Russell makes some clutch adapter fittings that can be used to convert over to AN style lines although you'll probably blow your entire budget on the fittings and lines.
I already have the braided line, but the adapter fittings are a budget killer.
The oem lines and braided lines are both typically plastic tubing with a protective cover. You may be able to salvage that special oem slave fitting by cutting lines somewhere in the middle, push back the covers, and join/adapt the oem to your braided line using common hardware store compression fittings.
Really????
You think compression fittings would hold?
Speedway sells a nylon brake line kit that uses compression fittings... https://www.speedwaymotors.com/Speedway-Lightweight-Nylon-Racing-Brake-Line-Kit,1993.html
It's rated to 900psi burst, clutch systems are usually less than 400psi.
Grant
I have a brand new master for 80’s gm a body (yeah, manual chevy celebrity stuff) doing absolutely nothing in my dad’s garage i think. Factory pre bled with reservoir, line, and slave all as one unit. I can check next time i’m over there. I don’t think it’s gone anywhere.
Cool. Just let me know!
Dad really wants to trst fit a single reservoir brake master. So we may try it tomorrow night after work....
i think my 85 iroc Camaro has a 7/8" clutch master. its got a remote reservoir as well.
Doing a little reading, and found this. Hope it gives some insight on the clutch issues. Rock Auto has the clutch master for around $20.00
https://forum.miata.net/vb/showthread.php?t=246366&highlight=clutch
In reply to Dirtydog :
I had found similar posts. But in another thread we worked out the math for my hydraulic throwout bearing setup that I am running and proved that 7/8 was the size I needed at a minimum. Unfortunately the Land Cruiser stuff is only three quarters.
I might have an Airheart 7/8” MC on the shelf at home, or it may have been in the box of goodies I gave to another board member (after posting here) when I was cleaning the garage a few months ago. I can check on Friday.
In reply to AngryCorvair :
Please! That would be fantastic!
In reply to CJ :
I have that one in my cart. But have no idea what i would need for plumbing.
The dead pedal on stand up fork lifts use a clutch master. Back when I worked at a huge food distributor warehouse, I use to bring home boxes of them after they started leaking. It was easier and cheaper to just replace them rather than rebuild them. They mostly looked like Tilton with a removable res, but some looked like the Girling ones. They were much cheaper than the ones slated for cars.
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