Car has ls1 brakes at all 4 corners. I want to use the lt1 master, I like the looks of it better than the ls1 master. Any problems with this other than fittings?

 

I thought the fittings were the same? 12x1 mm and 11x1.5. My thought is your pedal stroke will become longer after the swap. you should have a 32mm/24mm dual stage master stock, going to the LT1 straight bore of 1 inch will require more stroke to fill and pressurize theoretically.

 

I've had both 3rd gen and 4th gen LS1 master cylinders. The feel is indistinguishable. Yes, the stock master cylinder has a 32 mm step in the bore, but the majority of the bore is still same as rear brakes (24 mm or 25 mm, whatever the number may be).

 

Other then the fittings not matching it will work. It will likely have a better feel then the stock quick take-up design. Then only other down side is that with the larger bore you will need to use more pedal pressure for the same stopping rate.

RBob.

 

I thought if anything that the 3rd gen master is slightly larger bore. 1" (25.4 mm) plus the step, versus a 24 mm bore of the 4th gen style.

Again, my non-professional foot could not tell the difference.

 

The LT1 & LS1 M/C have a 1" bore (25.4 mm). The 3rd gen M/C bore apparently varied between 25.4mm and 24mm over the years. With the 24mm bore being used more often.

When I upgraded the front brakes the smaller caliper piston area reduced the front braking by 28%. However, the larger diameter rotors and pads with a higher friction rating made up for it. Same can occur when a larger diameter M/C is installed at the same time larger rotors and better pads are used.

RBob.

 

Yes, it is a given that different brakes can produce a different brake pedal feel. That is neither here nor there for the OP.

 

another question, I think I am going to be replacing the booster while I'm in there. should i use the lt1 complete booster/mc setup or stick with 3rdgen booster. something about the rod or something i remember being different

 

This thread has a ton of LS1 & LT1 brake booster & M/C information:

https://www.thirdgen.org/forums/brak...r-mc-help.html

RBob.