MityVac bleeding clutch slave through remote bleeder
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,389
Likes: 3
From: somewhere shooting my assault rifles
MityVac bleeding clutch slave through remote bleeder
I had a very strange problem this morning.
I wanted to bleed clutch hydraulics this morning through remote bleeder using Mityvac. I did enough fluid to re-fill reservoir 2 times.
Went for a drive and clutch was slipping big time. Could barely give it any throttle and clutch slipped.
Ive read that if too much vacuum is applied doing it this way the clutch master seals can be pulled backwards or something to that effect even though I wasnt pulling more than 15 hg. I finally had son get in car and bled the remote the old fashioned way stomping on pedal and opening bleeder. Went for a drive and problem was gone.
I dont think I did any permanent damage to the clutch master as it appears to be fine now.
I wanted to bleed clutch hydraulics this morning through remote bleeder using Mityvac. I did enough fluid to re-fill reservoir 2 times.
Went for a drive and clutch was slipping big time. Could barely give it any throttle and clutch slipped.
Ive read that if too much vacuum is applied doing it this way the clutch master seals can be pulled backwards or something to that effect even though I wasnt pulling more than 15 hg. I finally had son get in car and bled the remote the old fashioned way stomping on pedal and opening bleeder. Went for a drive and problem was gone.
I dont think I did any permanent damage to the clutch master as it appears to be fine now.
Last edited by Z06supercharged; Mar 3, 2011 at 09:56 PM.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
DID you get a continuous stream of air when you used the mityvac???
The bleed fitting, when loosened, does not seal very well and will/can allow air to leak in around the bleed fitting threads.
Just use the old fashion "PUSH/open, bleed/tighten/release.. UNTIL THE AIR IS ALL GONE.
BC
The bleed fitting, when loosened, does not seal very well and will/can allow air to leak in around the bleed fitting threads.
Just use the old fashion "PUSH/open, bleed/tighten/release.. UNTIL THE AIR IS ALL GONE.
BC
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,389
Likes: 3
From: somewhere shooting my assault rifles
I took my bleeder screw completely out and used a pointed rubber fitting on my MV hose so it was a air tight seal on bleeder tapered end. As you know you cannot get a good bleed leaving bleed screw on and loosening it a little and re-tightening as air will get in. Once im done I dunk the end in a cup of fluid and put bleeder screw back in so no air get in.
I didnt get any air out but lots of slightly darker fluid so I kept it up until it cleared. I change the reservoir a lot to keep it clean Ranger method and it never darkens anymore.
After looking at diagrams apparently I over-pressurized the system and with too much vacuum and it was the same condition as if the pedal stayed down a tad or slave stayed pushed down on fingers enough to disengage slightly.
I didnt get any air out but lots of slightly darker fluid so I kept it up until it cleared. I change the reservoir a lot to keep it clean Ranger method and it never darkens anymore.
After looking at diagrams apparently I over-pressurized the system and with too much vacuum and it was the same condition as if the pedal stayed down a tad or slave stayed pushed down on fingers enough to disengage slightly.
Last edited by Z06supercharged; Mar 4, 2011 at 05:55 PM.
Race Director
Joined: Aug 2000
Posts: 10,649
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From: Central Florida
Z06Supercharged, this may be helpful.
Ranger
Bleeding a Clutch Via an Installed Remote Bleeder
Courtesy of “wrencher,” a moderator on LS1Tech.com and a GM Tech by profession. Reproduced and edited with permission.
A remote bleeder and Mity-Vac are absolutely essential to making the clutch bleeding procedure a one-man operation.
Connect a Mity-Vac to the outlet on the remote bleeder. To ensure a tight seal, apply a little “sil-glide” to the threads on the bleeder.
Next, start by draining the reservoir with a syringe. Refill with clean fluid.
Then proceed to pull a slight vacuum & pull the fluid in normal flow direction w/ the Mity-Vac brake fluid bleeding attachment.
Keep doing it till the fluid comes out clean. Make sure you keep the reservoir at the proper level throughout.
wrencher states: I usually keep an eye on the fluid color & flush by the look of it.
I drag race my car a lot. I flush before and after every track visit.
If I don’t, the pedal changes & I know it's flush time.
I do a fluid change & all is well again.
By following this routine, I’ve kept my master cylinder working correctly for 3-4 years now while doing a lot of racing.
Thanks to wrencher for the info.
Courtesy of “wrencher,” a moderator on LS1Tech.com and a GM Tech by profession. Reproduced and edited with permission.
A remote bleeder and Mity-Vac are absolutely essential to making the clutch bleeding procedure a one-man operation.
Connect a Mity-Vac to the outlet on the remote bleeder. To ensure a tight seal, apply a little “sil-glide” to the threads on the bleeder.
Next, start by draining the reservoir with a syringe. Refill with clean fluid.
Then proceed to pull a slight vacuum & pull the fluid in normal flow direction w/ the Mity-Vac brake fluid bleeding attachment.
Keep doing it till the fluid comes out clean. Make sure you keep the reservoir at the proper level throughout.
wrencher states: I usually keep an eye on the fluid color & flush by the look of it.
I drag race my car a lot. I flush before and after every track visit.
If I don’t, the pedal changes & I know it's flush time.
I do a fluid change & all is well again.
By following this routine, I’ve kept my master cylinder working correctly for 3-4 years now while doing a lot of racing.
Thanks to wrencher for the info.
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,389
Likes: 3
From: somewhere shooting my assault rifles
Thanks Ranger for that article.
The trick is to use a VERY SLIGHT amount of vacuum when doing it with a MityVac. If you use to much vacuum you will have the problem I had. Found another person that had the same exact thing happened to.
I'll just use the pedal way from now on as no way im taking a chance of that happening again and will never use the MV again as it really isnt needed unless you are all alone and need a bleed badly..
The trick is to use a VERY SLIGHT amount of vacuum when doing it with a MityVac. If you use to much vacuum you will have the problem I had. Found another person that had the same exact thing happened to.
I'll just use the pedal way from now on as no way im taking a chance of that happening again and will never use the MV again as it really isnt needed unless you are all alone and need a bleed badly..
Last edited by Z06supercharged; Mar 5, 2011 at 10:49 AM.
