4 Wheel disc, soft pedal

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I am leaning towards master cylinder being too small also. I believe the front calipers are 2.5" and if the rears are also, there's no bias between front and rear.

I have 73+ front disc with Ford Cobra rear discs. The caliper bores are significantly smaller. And I use a 15/16 master.
 
I am leaning towards master cylinder being too small also. I believe the front calipers are 2.5" and if the rears are also, there's no bias between front and rear.

I have 73+ front disc with Ford Cobra rear discs. The caliper bores are significantly smaller. And I use a 15/16 master.

These are the later 2.75" front calipers, but the rest of your point stands.

Thanks everyone for your help. Going to order a larger MC today. I'll post back with results.
 
These are the later 2.75" front calipers, but the rest of your point stands.

Thanks everyone for your help. Going to order a larger MC today. I'll post back with results.

Oh gotcha. Yes, let us know the results. Are you getting the new one from Dr. Diff?
 
Oh gotcha. Yes, let us know the results. Are you getting the new one from Dr. Diff?

Yes, most likely. I bought all my other brake parts besides the rears from Cass, and only those because I didn't want parking brake provisions. My mistake. I'd do it differently if I could.
 
What are you working on? You can try tapping on the calipers while bleeding. I'm not impressed with rightstuff, and wished I bought something else. If this was a manual brake car, the pedal may need to have the pedal re-drilled due to the ratio wrong. This is typical of too small of MC. my 2 cents
 
Yes, kit uses the GM front calipers as rears.

Car is on the floor currently so I'll need to verify later today, but I looked up the kit I bought, got the caliper p/n and did some digging. 2.5" is the bore size according to the almighty Google.
That's a pretty large piston for the rears, what are You using for proportioning?
 
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