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Soft pedal on 72

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Old May 8, 2017 | 09:33 PM
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Default Soft pedal on 72

OK. I discovered a leak on my back right rear caliper. I replaced it but forgot to plug line and the rear of the MC went dry. Today I started by gravity feeding brakes. Did this for about an hour. Then dad came over and did the 2 person bleed job. The brakes never firmed up. Pedal going to floor. I did notice bubbles in the front chamber of MC, is this normal?
we bleed for over an hour. Never improved. I am lost. Could it be bad MC?
This is a non power brake 72.

Thanks
​​​​​​​Joey
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Old May 8, 2017 | 09:53 PM
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Originally Posted by Joe79Vette
OK. I discovered a leak on my back right rear caliper. I replaced it but forgot to plug line and the rear of the MC went dry. Today I started by gravity feeding brakes. Did this for about an hour. Then dad came over and did the 2 person bleed job. The brakes never firmed up. Pedal going to floor. I did notice bubbles in the front chamber of MC, is this normal?
we bleed for over an hour. Never improved. I am lost. Could it be bad MC?
This is a non power brake 72.

Thanks
​​​​​​​Joey
If the rear went dry, you may need to bench bleed (or on the car) bleed the master first, then follow with the wheels. You may also need to raise the rear of the car to get all of the air out when gravity feeding. My 70 had been sitting for years when I got it with at least one leaking caliper - so no pedal. it took multiple sessions to finally get the pedal up and firm. Tough to get the air and old fluid all out. I had bubbles in the master for quite a while and only later read about bleeding it first.

Check this out:
http://www.hobbycarcorvettes.net/c3-...-brake-system/

Also info on this forum if you do a search. Good luck getting squared away.

Joel
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Old May 8, 2017 | 11:36 PM
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Thanks. Looks like I will be bench bleeding my MC tomorrow. I hope that is the issue.

thanks again
​​​​​​​Joey
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Old May 11, 2017 | 07:30 AM
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The master is probably fine. It just can take a very long time to get all of the air out of the brake system in these cars once it enters in any quantity. A vacuum bleeder (I use a manual one) can save you serious time, and they cost <$100 if you can spare it.

Last edited by Brcmpbl; May 11, 2017 at 07:30 AM.
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