cumminscruiser
Adventurer
I would like to replace my stock mastercylinder with a GM hydrboost, any help in partnumbers etc. would be great.
The pump is stock '85 cummins 6BT5.9
The pump is stock '85 cummins 6BT5.9
FJ60 Hydroboost
- Thread starter cumminscruiser
- Start date
dieselcruiserhead
16 Years on ExPo. Whoa!!
Mid 90's GMC Safari or Astro vans are the most common & universal application. It is optional for them but I've found at least 40% had it. The exact same model is a 1995 6.5 diesel Suburban or Tahoe, same mounting pattern. There are several variants that will not work but both of these bolt into a Land Cruiser very well using your drill and modifying the stock linkage.
I have found the costs of hydroboost to be very high and that used parts have been very reliable. Therefore, IMO nothing wrong with the drastically more inexpensive junk yard route IMO. If you have a pick-n-pull I have bought all necessary parts for less than $40. I use the stock GM master cyl with no other brake line components with the 40/55/60/mini truck components just fine.
The routing goes pump > hydroboost (where there is a low pressure to pump & high pressure to steering box return) > steering box > low pressure back to pump.
The power is awesome and it is a welcome addition over the stock setup. It balances a FJ60 pump very well. I have only used the 4BT pumps which are a gear driven saginaw pump that is also the highest volume pump out there commonly used in belt driven apps by the hydraulic-assist off-road guys. If you want to get rid of your vaccuum component I have a feeling someone over at www.4btswaps.com would probably trade.
I hope it helps,
Andre
I have found the costs of hydroboost to be very high and that used parts have been very reliable. Therefore, IMO nothing wrong with the drastically more inexpensive junk yard route IMO. If you have a pick-n-pull I have bought all necessary parts for less than $40. I use the stock GM master cyl with no other brake line components with the 40/55/60/mini truck components just fine.
The routing goes pump > hydroboost (where there is a low pressure to pump & high pressure to steering box return) > steering box > low pressure back to pump.
The power is awesome and it is a welcome addition over the stock setup. It balances a FJ60 pump very well. I have only used the 4BT pumps which are a gear driven saginaw pump that is also the highest volume pump out there commonly used in belt driven apps by the hydraulic-assist off-road guys. If you want to get rid of your vaccuum component I have a feeling someone over at www.4btswaps.com would probably trade.
I hope it helps,
Andre
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cumminscruiser
Adventurer
Hydroboost
Thanks, In my case I have a 6bt5.9 in my FJ60 so the pump should work ok. I read somewhere the are pumps with two outlets or returns, is the correct or needed? I guess I need to change the brake line fittings as well.
Bill
Thanks, In my case I have a 6bt5.9 in my FJ60 so the pump should work ok. I read somewhere the are pumps with two outlets or returns, is the correct or needed? I guess I need to change the brake line fittings as well.
Bill
ntsqd
Heretic Car Camper
The difference is one return barb or two return barbs on the sheet metal reservoir surrounding the pump itself. Some guys can simply 'T' the returns together and it works for them. Others try it and have weird brake problems. I think I'd try the 'T' first since it's easy.
As I recall these pumps are located low-left on the BT's and used the "Canned Ham" type reservoir. If you had to, extending the reservoir at the fill cap up to a higher level would allow adding a second return without disturbing the reservoir. I've seen this done with nothing more than a piece of hose, a couple hose clamps, and the part of the can that the cap screws into.
Some of the pump surrounds are very rounded and have a large bung at the top to use a remote reservoir. These are typically found on the carb'd 7.4L crew cab dually GM trucks. I believe that the surround and reservoir (upper and lower reservoirs?) should fit your pump.
There are "Canned Ham" 2 return cans out there, but I caution in R&Ring the pump from the can. It can be done, but it is exceptionally easy to warp the can ever so slightly and PS fluid must have been designed for leak detection.
As I recall these pumps are located low-left on the BT's and used the "Canned Ham" type reservoir. If you had to, extending the reservoir at the fill cap up to a higher level would allow adding a second return without disturbing the reservoir. I've seen this done with nothing more than a piece of hose, a couple hose clamps, and the part of the can that the cap screws into.
Some of the pump surrounds are very rounded and have a large bung at the top to use a remote reservoir. These are typically found on the carb'd 7.4L crew cab dually GM trucks. I believe that the surround and reservoir (upper and lower reservoirs?) should fit your pump.
There are "Canned Ham" 2 return cans out there, but I caution in R&Ring the pump from the can. It can be done, but it is exceptionally easy to warp the can ever so slightly and PS fluid must have been designed for leak detection.
cumminscruiser
Adventurer
Hydroboost
Thanks for the info, now that the cooling fan is out of the way thers lots of room.
Thanks for the info, now that the cooling fan is out of the way thers lots of room.