Thread: Brake Bore Inlet Size

Hey guys. I'm going to buy new Monte Carlo calipers and brackets, with new 12" rotors, as I want to upgrade my brakes. I know I don't need the calipers, but mine are old and worn out, and wayyyy too rough of a surface to powdercoat. I saw RockAuto has Raybestos professional grade calipers. They have 2 different styles of semi-loaded calipers. They have a 1.5" bore inlet and a 2.5" bore inlet. Is a bigger bore better? The 2.5" one is cheaper. I'm a little confused. Thanks.

1.5" is rear.

2.5" is front.

Professional Grade; Friction Ready - Pads Not Included, Remanufactured; Bore Size=1.5" Inlet Thread=M10X1.5 Bleeder Thread=M10X1.5
Contains Bracket; Rear Left

Professional Grade; Friction Ready - Pads Not Included, Remanufactured; Bore Size=2.5" Inlet Thread=M10X1.5 Bleeder Thread=M10X1.5
Contains Bracket; Front Left

Originally Posted by matt5112

1.5" is rear.

2.5" is front.

Ahhhh shoulda read!!! Thanks man!

np.

I love you, Matt.

P.S. I'm really drunk.