Join Date: Nov 1999
Location: Central California, USA
Re: master cylinder trouble
You need the brake pedal return spring installed, I believe it attaches to a tab where the brake pushrod clevis attaches. The pedal should be pulled up against the rubber bumper a square block near the brake light switch. Once the pedal is up in the correct position, adjust the pushrod length until a slight amount of clearance is felt between pushrod and master cyl. .010" is the spec, do it by feel, it doesn't have to be exact, but you do need to insure the MC piston returns fully.
Once the pushrod is set, pump the brakes slowly for 5 or 10 minutes, this may clear any air in the master cyl bore and get rid of the spongy feeling. If not, then try bleeding the brakes again. If any lines were removed, check the connections. Excess rear play may easily cause a low pedal, did you make any changes to your front or rear brakes?
A 7/8" bore is very small for a stock 69 disc system. 1" is used stock.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70