Wilwood brake issue

[Apogee]

Oops did not see Apogees thorough description of the spec.
If your brakes are still not to you liking with a 1in bore and the pedal travel is not excessive, wilwood makes a 7/8 master. My buddy runs on with all stock disc and drums from a 76-77 without power and it stops awesome with 35in tires.

I've run the Ø7/8" and Ø15/16" bore Wilwood (and other) master cylinders on numerous brake kits (mostly C5/C6-based Corvette stuff) in muscle car applications, and my main concern would be whether you would have enough pedal travel in the case of a front or rear brake failure with the caliper piston areas used on the EB kits.

The front caliper piston area on the EB kit is 5.08 sq in whereas it's ~20% smaller on most of their larger kits, at 4.04 sq in, which is more in line with the C5/C6 Corvette stuff.

Similarly in the rear, the EB kits use 4-piston calipers with 3.00 sq in effective piston area, whereas most of their higher performance (Forged Narrow Superlite, Aerolite, etc) kits run 1.98 sq in and the C5/C6 Corvette stuff is generally 2.20-2.46 sq in.

While I know you can run a Ø7/8" bore MC with the EB brakes noted in this thread, my concern would be if you had a failure, do you have enough travel in the pedal to mechanically (vs hydraulically) stroke the piston enough to still make pressure anywhere? That's the question...if the answer is no, then the MC is undersized for the application IMO, because you're effectively running a single-pot master cylinder at that point without the benefits offered in terms of safety with a tandem unit.

Tobin

 

[68ford]

I've run the Ø7/8" and Ø15/16" bore Wilwood (and other) master cylinders on numerous brake kits (mostly C5/C6-based Corvette stuff) in muscle car applications, and my main concern would be whether you would have enough pedal travel in the case of a front or rear brake failure with the caliper piston areas used on the EB kits.

The front caliper piston area on the EB kit is 5.08 sq in whereas it's ~20% smaller on most of their larger kits, at 4.04 sq in, which is more in line with the C5/C6 Corvette stuff.

Similarly in the rear, the EB kits use 4-piston calipers with 3.00 sq in effective piston area, whereas most of their higher performance (Forged Narrow Superlite, Aerolite, etc) kits run 1.98 sq in and the C5/C6 Corvette stuff is generally 2.20-2.46 sq in.

While I know you can run a Ø7/8" bore MC with the EB brakes noted in this thread, my concern would be if you had a failure, do you have enough travel in the pedal to mechanically (vs hydraulically) stroke the piston enough to still make pressure anywhere? That's the question...if the answer is no, then the MC is undersized for the application IMO, because you're effectively running a single-pot master cylinder at that point without the benefits offered in terms of safety with a tandem unit.

Tobin

While I cant answer your question about fluid volume if one circuit failed, I will add, he did lengthen the pushrod slightly to raise the pedal to have more potential stroke. He told me with everything original(1in bore OEM master), the pedal contacted the floor before the master cylinder bottomed out. knowing the 7/8 master would likely require greater pedal travel, he lengthened the pushrod. I do not know by how much. I also would not be surprised if he has T Bird calipers due to how easily it stops without assist and the early 90s EFI idling at 800rpm in gear.