V1 Master cylinder leaking

[Amack1970]

I just noticed I have a small fluid leak between the back of my master cylinder and the brake booster. I used a 2010 cobalt SS as my donor. Do I have to use the same master cylinder from that car, or can I us a LS model. None of the local parts guys have the SS one in stock, but they have tons of LS ones and there cheaper. Let me know what you guys think
Thanks

 

[Desert Sasqwatch]

Anthony, can someone tell you if there is a difference in the piston size between the two MCs? The other significant difference could be brake pedal stroke ratio that could affect pedal travel and the MC piston travel. I don't want to ask if you have checked the local boneyards, since the last time I looked it was easier to find a Corvette than a Cobalt SS in any of them.

 

[Parson Green]

I just noticed I have a small fluid leak between the back of my master cylinder and the brake booster. I used a 2010 cobalt SS as my donor. Do I have to use the same master cylinder from that car, or can I us a LS model. None of the local parts guys have the SS one in stock, but they have tons of LS ones and there cheaper. Let me know what you guys think
Thanks

A "correct" SS master cylinder will have, on the plastic reservoir, an extra, clutch-operation-related nipple.

That fact makes them atypical and hence more expensive and/or difficult to source.

Is the presence of said nipple the only difference between the SS ones and the LS ones? Methinks yes but YMMV.

 

[Karter2026]

A "correct" SS master cylinder will have, on the plastic reservoir, an extra, clutch-operation-related nipple.

Is the presence of said nipple the only difference between the SS ones and the LS ones? Methinks yes but YMMV.

I have a LT donor that has the clutch nipple. Here are some bore size differences for the master Cyl.
SS Cyl

Base Cyl

 

[Amack1970]

A "correct" SS master cylinder will have, on the plastic reservoir, an extra, clutch-operation-related nipple.

That fact makes them atypical and hence more expensive and/or difficult to source.

Is the presence of said nipple the only difference between the SS ones and the LS ones? Methinks yes but YMMV.

Oh, that's right. So I get to bleed the clutch too. Awesome!

 

[Parson Green]

Oh, that's right. So I get to bleed the clutch too. Awesome!

That bleeding port at the bellhousing can be a major PITA to get to. Best to get done with your bleeding before things get too congested in that area.