Let's talk about brake fluid

[secondchance]

I never knew there was master bore size change between early vs. later Z. My ZR-1 is a 94. Would you know master bore size?
Pedal seems a bit softer than it use to be. Could be due to brake fluid being 2 years old Wilwood EXP 600. Pedal travel is reasonable but I favor shorter firm pedal.
I have not tested front vs. rear lock up test. I’ll have to try your suggestion.

[tnova]

Your bore size is 15/16". Here's part of the write-up I PM'd you. Note that you may have to modify the ends of the brake lines for different thread sizes if you switch master cylinders. I don't have the details on the Suburban master cylinder. I also don't know about later model C5/6/7 MCs which I've heard of people adapting:




I first became aware ofthe problem when A friend installed some Wilwoods 6p calipers on his car.Braking was better but nowhere near impressive. The car stopped well but wouldnot get the ABS excited enough to engage. That’s because his 6 pistons requiredLOTS more volume to move against the rotor. No volume = no movement. Untilthere is enough volume transmitted from the MC the caliper can only move asmuch as the fluid allows. When you're trying to move big pistons or lots ofsmall pistons you have to move more fluid to get the same results as before.Basic hydraulics.

The same problem exists on my car with thebigger 2 piston calipers. They need twice the fluid that the MC was deliveringbefore. OR...a longer stroke. That’s what I do not want...is to push the pedalto the floor. Takes too long and the recovery time becomes an issue when thepedal is somewhere in between full ready and bottomed out.

I've seen a C4 system that was set up with abigger MC and the difference will throw your eyeballs out of their sockets whenyou hit the brakes hard...

That car was set up with a kit the guy boughtbut has no idea of what kind of MC it is or where it came from. Someone foundit somewhere that he can no longer locate.....


The bias spring will notfix the problem. The problem has been solved by few people. They installed aCamaro MC and claim great results. This is something I got to do.


87 master Brake MasterCylinder
Bore Size : 7/8"
Line thread Size : M12-1, M10-1


The '88-'91 master cylinder
Bore size: 7/8"
Line thread size 12M x 1 and 10M x 1


The '92-'94 master cylinder
Bore size 15/16"
Line thread size 12M x 1 and 10M x 1


The '95-'96 master cylinder
Bore size 15/16"
Line thread size 12M x 1 and 10M x 1


98-2002 Camaro = 1" bore
Bore Size 1"
Line thread size 11mx1.5 and 12mx1

[secondchance]

I appreciate the info.