68 brake bleeding
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Joined: Nov 2011
Posts: 95
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From: Indiana
68 brake bleeding
I had to replace front calipers and hoses. I cut hoses and let drain in jar while waiting for parts. Today I found both chambers in MC were empty. I thought only one wpould be empty. After bleeding front and rear I have mushy brakes and can't lock up brakes. Any ideas what I did wrong? Could MC need to be bled before lines since it was empty of fluid? Gonna try bleeding again tomorrow see
if any air comes out . Thanks, Tom
if any air comes out . Thanks, Tom
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Anytime the master is allowed to empty itself, it must be removed and placed in a bench vice.
You will never get the air out otherwise.
Click on my avatar.
Look for photo albums - bench bleeding.
I suspect the master is shot. Front & rear systems are separated by piston seals.
Yours did not contain fluid in one reservoir.
Unless you have another leak downstream . . . . . .
You will never get the air out otherwise.
Click on my avatar.
Look for photo albums - bench bleeding.
I suspect the master is shot. Front & rear systems are separated by piston seals.
Yours did not contain fluid in one reservoir.
Unless you have another leak downstream . . . . . .
Le Mans Master
Joined: Jan 2001
Posts: 6,742
Likes: 1,384
...and I would not try to do brake bleeding on my vette without a pressure bleeder. Buy or make one. It's cheap to make one and easy if you don't want to wait for one to get shipped.
I had to replace front calipers and hoses. I cut hoses and let drain in jar while waiting for parts. Today I found both chambers in MC were empty. I thought only one wpould be empty. After bleeding front and rear I have mushy brakes and can't lock up brakes. Any ideas what I did wrong? Could MC need to be bled before lines since it was empty of fluid? Gonna try bleeding again tomorrow see
if any air comes out . Thanks, Tom
if any air comes out . Thanks, Tom
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
I had to replace front calipers and hoses. I cut hoses and let drain in jar while waiting for parts. Today I found both chambers in MC were empty. I thought only one wpould be empty. After bleeding front and rear I have mushy brakes and can't lock up brakes. Any ideas what I did wrong? Could MC need to be bled before lines since it was empty of fluid? Gonna try bleeding again tomorrow see
if any air comes out . Thanks, Tom
if any air comes out . Thanks, Tom
Get the last bit of air out from the brake master cylinder. - CorvetteForum - Chevrolet Corvette Forum Discussion
This is always worked if I the the MC Drained.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
With an empty master cylinder, whether its 50 yrs old or brand new out of the box, it must be prepped like its brand new.
No one would / should install a new unit without bench bleeding, right?
Two mounting nuts take two seconds to remove. The two brake-lines take another two seconds to remove.
The lines have air in them anyway,
So, there is no excuse not to bench bleed.
Do it right once.
Do it wrong several times.
No one would / should install a new unit without bench bleeding, right?
Two mounting nuts take two seconds to remove. The two brake-lines take another two seconds to remove.
The lines have air in them anyway,
So, there is no excuse not to bench bleed.
Do it right once.
Do it wrong several times.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
I wise man takes his old MC with him to the store to compare with the replacement.
Note the back side mounting and piston design. There are different, models / yrs.
It seems some younger parts counter employees are too quick to read part numbers on their screen involving an asterisk.
So.
Fits All Vettes From 1880 - 2026. Should fit, right?
Use caution when bench bleeding the new unit.
Do Not Force The Piston In More Than 1 & 3/8 inches or it voids warranty.
Click on my avatar, look for bleeding photo album for tips.
Note the back side mounting and piston design. There are different, models / yrs.
It seems some younger parts counter employees are too quick to read part numbers on their screen involving an asterisk.
So.
Fits All Vettes From 1880 - 2026. Should fit, right?
Use caution when bench bleeding the new unit.
Do Not Force The Piston In More Than 1 & 3/8 inches or it voids warranty.
Click on my avatar, look for bleeding photo album for tips.
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