Brake bleed issues!
Thread Starter
2nd Gear
Joined: Mar 2024
Posts: 2
Likes: 0
Brake bleed issues!
Help! A few years ago I acquired this 1993 corvette lt1 from my grandfather! I’ve been working on it ever since. Recently the brake booster went out so I changed it and the master cylinder. Today I decided to bleed the brakes and casually made my way through the process when I reached the front brake on the driver side I couldn’t get any fluid. I tried to gravity bleed and vacuum bleed and have nothing. I started chasing brake lines. I found everything after the abs/asr system up to the caliper behind is clear and able to flow fluid. Should I change the abs/asr system? I didn’t keep chasing lines as I couldn’t tell what went where. All the other calipers bled fine with zero issues.
Racer
Joined: Oct 2007
Posts: 331
Likes: 234
From: Markdale , Ontario
Welcome to the forum.
Did you remove the bleed screw completely and still get nothing?
Sounds to me like your brake flex hose has collapsed on the inside creating its own check valve. The dot 3 brake fluid if old and dirty starts effecting the insides of the flex hoses and a flap can peel away and close the flow. This can happen for fluid going in or fluid going out.
I would personally change all 4 flex hoses.
Actually went through the same thing early last year restoring my 86, with two callipers (one front and one back) not bleeding.
Did you remove the bleed screw completely and still get nothing?
Sounds to me like your brake flex hose has collapsed on the inside creating its own check valve. The dot 3 brake fluid if old and dirty starts effecting the insides of the flex hoses and a flap can peel away and close the flow. This can happen for fluid going in or fluid going out.
I would personally change all 4 flex hoses.
Actually went through the same thing early last year restoring my 86, with two callipers (one front and one back) not bleeding.
Last edited by weeles; Mar 24, 2024 at 04:19 AM.
Thread Starter
2nd Gear
Joined: Mar 2024
Posts: 2
Likes: 0
I did remove the bleeder screw all the way and got nothing. Flex hoses are on my list for sure! For the time being I can’t get any fluid through the Abs/asr pump system out of the LF side all other lines have fluid to them. When broke loose at the abs/asr pump.
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
It's not your rubber lines. They don't collapse and firm a complete block like people keep saying, though it is a good idea to change out old rubber. Your abs unit has a block in it. Some of the internal fluid passages are really small, and will clog up with rust/gunk if the brake fluid is not refreshed for a long time.
Racer
Joined: Oct 2007
Posts: 331
Likes: 234
From: Markdale , Ontario
It's not your rubber lines. They don't collapse and firm a complete block like people keep saying, though it is a good idea to change out old rubber. Your abs unit has a block in it. Some of the internal fluid passages are really small, and will clog up with rust/gunk if the brake fluid is not refreshed for a long time.
Last edited by weeles; Mar 24, 2024 at 06:06 PM.
