rdohara
1/2 ton status
I have an 84 k5 with 6.2 and hydro boost put a 14 bolt rear on it with disk brakes. Do you need to swap out the proportioning valve and master cylinder to go with the disk brake swap?
CK5
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Rear Disk brake NEW master and Proportioning valve????
- Thread starter rdohara
- Start date
I ended up having too. I put an adjustable valve in line to the front and cranked it tight closed to get the correct proportioning. I took the stock valve out and ran new lines anyways so it wasn't a big deal for mine...
replace your orignal with this http://www.summitracing.com/parts/WIL-260-11179/
or bypass the stock on the rear line only. then mount this in line with the rear up by the master to keep it high and dry. http://www.summitracing.com/parts/SUM-G3905/
then few test drives to dial it in and go have fun.
or bypass the stock on the rear line only. then mount this in line with the rear up by the master to keep it high and dry. http://www.summitracing.com/parts/SUM-G3905/
then few test drives to dial it in and go have fun.
rdohara
1/2 ton status
just bought one of these http://www.purechoicemotorsports.co...e=product/product_id=125/mode=prod/prd125.htm
PANCAKE
1/2 ton status
I did this conversion on my 83 k3500 with hydro boost and did not switch the master cylinder or the propottioning valve. The truck stops great. I would try it without switching the valves out....you may get lucky.
rdohara
1/2 ton status
ChuckMoney
Registered Member
If you just pull the rear lines off the P valve, do you have to plug the holes left on the P valve?
Thanks!
Thanks!
rdohara
1/2 ton status
so after looking at a few disk/disk master cylinders they all have 1.125" diameter pistions and the stock master has a 30mm pistion (a little bigger then 1.125") S o i am thinking the stock master with that disk/disk prop. valve should be just fine???
PANCAKE
1/2 ton status
You take stuff to literally.
Getting lucky is not switching the valves over and the braking system working properly.
Me, and several others have done a rear disc conversion on tow rigs without switching the valves and the brakes work great.
But.....if you would rather spend the money without seeing how the brakes work that is up to you.
Getting lucky is not switching the valves over and the braking system working properly.
Me, and several others have done a rear disc conversion on tow rigs without switching the valves and the brakes work great.
But.....if you would rather spend the money without seeing how the brakes work that is up to you.
Last edited:
86TPIBurb
Registered Member
Not intending to threadjack, but where are you guys finding rear disc setups for 6 lug?
PANCAKE
1/2 ton status
I still say try it without the prop. valve.
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rdohara
1/2 ton status
Well the purpose of using a disk/disk master cylinder is because they use a larger piston then a disk/drum. So it seems that every master cylinder i have found that is a disk/disk has a smaller piston then the stock disk/drum. So what I have found so far is that the stock Hydro boost master cylinder use a large piston in it already that is bigger than any disk/disk ones I have found.
Swap a 14bff and disc convert. Than go get a d60front, lift it, and start again on-the-job next truck.
JK!
I don't know, but a 3/4 ton 6 bolt rotor might work with the caliper and bracket if you have some good Fab skills
ChuckMoney
Registered Member
prob a good idea just to keep crap out.
thay do make plugs with dubble 45* seat built in to them.
thay do make plugs with dubble 45* seat built in to them.
