Need help bleeding clutch 91 F-250 Concentric Slave
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4wd Low
Joined: May 2023
Posts: 11
Likes: 0
Need help bleeding clutch 91 F-250 Concentric Slave
I replaced my clutch, slave, hydraulic line and master cylinder and I've been trying to bleed it for almost a week... I've read other forums on this but still no luck. I've pumped and bled and tried vacuum bleeding from the master. While vacuum bleeding it, i dont see anymore bubbles and I keep getting medium firmness but cant engage the clutch. I hear sloshing in from the slave that makes me think there's a big air pocket trapped there? Any ideas?
Lead Driver
Joined: Feb 2002
Posts: 7,952
Likes: 589
From: Greater Austin, Texas
I gotta tell you, every internal slave cylinder I've ever worked on I bled by just opening the bleeder valve and letting it drip for a while. Now, the external slaves are harder because the bleeder is too low. However, you may have some success using my method on those external slaves - I park the truck on a hill to get the nose as high as I can, then I give the pedal 10 full pumps and then let it sit for at least 30 minutes. Repeat this as many times as it takes to get a firm pedal - usually takes me 3-4 times.
Cargo Master
Joined: Mar 2007
Posts: 2,757
Likes: 998
That video explains what I cannot with words. I had a client that every 6 months, the pedal was low and every 6 months I took the system out to bleed it. Where the air was coming from, I do not know. In the end, I spent thousands of dollars and gave him back all the money he ever spent with me. The other shop had the same problems. What was the fix? The truck got totaled.
40 years in the business and this takes the cake over the most stupid design I have ever run across. It's the one and only job I could not fix. No, it was not junk parts. I used Factory and OEM parts.
40 years in the business and this takes the cake over the most stupid design I have ever run across. It's the one and only job I could not fix. No, it was not junk parts. I used Factory and OEM parts.
Thread Starter
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4wd Low
Joined: May 2023
Posts: 11
Likes: 0
Yeah it has been a pain. I was trying again last night and I started to see brake fluid come out the bottom of the bell housing... So I'm pretty sure the new slave I installed is now shot, I gotta start all over lol
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