BuiltZ28

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?

BBU.COM

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.

QwkTrip

iTrader: (22)

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).

RBob

iTrader: (1)

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.

QwkTrip

iTrader: (22)

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.

RBob

iTrader: (1)

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.

QwkTrip

iTrader: (22)

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

BuiltZ28

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

RBob

iTrader: (1)

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

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

RBob.