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Username Post: Hydraulic throw out bearing question        (Topic#362817)
apix17 
Contributor
Posts: 155

Loc: San Francisco Area
Reg: 12-22-07
10-05-20 07:08 PM - Post#2804921    

I am just discovering hydraulic throw out bearings. Would like to know if anyone has experience with them and if so what is your opinion as to operation and reliability. Thanks.



 


beagrizzly 
"12th Year" Gold Supporting Member
Posts: 2183
beagrizzly
Age: 70
Loc: south texas
Reg: 08-04-12
10-06-20 06:24 AM - Post#2804947    
    In response to apix17

apix,
The factory has been using hydraulic throwout bearing for over 50 years. The first one I has was in 62 half-ton, 292 I owned. They are used in everything from said pickup to F-350 Diesels. There was one in my 96 Z-28.
They used brake fluid, so you had to be careful if you topped it off. If you used ATF, you were in trouble.
As far as reliability, I had no issues with any of them. 250,000 miles on the F-350.
Hope this helps.
Griff

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
Rick_L 
Member #409
Posts: 27814
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
10-06-20 05:13 PM - Post#2805001    
    In response to apix17

There's more than one way to do a hydraulic clutch. I don't think the factory used a hydraulic throwout bearing until the 90s.

Anything prior to that was a slave cylinder rather than a hydraulic throwout bearing, including the 93-97 Z-28. All the truck deals from the 60s on were master/slave setups. A master/slave setup uses a clutch fork. A hydraulic throwout bearing does not.

To me, fitting a clutch master cylinder to a car that doesn't have one is a PITA. The only reason to do it is because the car has been modified so much (or butchered) so that stock mechanical linkage can't be used - or that you have a transmission setup like a T56 6 speed that used a hydraulic TOB from the factory and using mechanical linkage would be very difficult because of the way the bellhousing is built.

The aftermarket hydraulic TOBs had a reputation for leaking prematurely for many years. I don't know if they are any better recently.



 
beagrizzly 
"12th Year" Gold Supporting Member
Posts: 2183
beagrizzly
Age: 70
Loc: south texas
Reg: 08-04-12
10-08-20 11:54 AM - Post#2805118    
    In response to Rick_L

Rick,
You are correct. I was just referring to the hydraulics, and that they were pretty dependable. I have never run an aftermarket tob. so cannot speak to the leak issues.
I replaced a clutch in a Ford Ranger that had one. I believe it was a late 80's.
Personally, I have no love for mechanical linkage clutches. I know.........I know. DZ will probably jump in here. As much as I respect his opinions, I stll have mine. I love the hydraulic setups.
Griff


if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 


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