Disc brakes and boosters

[DMO]

I just finished installing disc brakes all around. I added brake booster and port valve. I have bench bled master cylinder and brakes lines but I can't build a firm pedal and when running the pedal drop straight to the floor. I can't find any leaks so I'm stumped. Any advice out there?

[Captainfab]

Did you get good fluid flow from the bleeders on all 4 calipers? What calipers are you using? What master cylinder? What booster?

[DMO]

The calipers in front are from LMC truck, rear are a conversion kit from Summit. The booster was given to me by a friend so I'm not sure on that one.

I did get flow from all bleeders. Stronger flow in the front than the rears

[DMO]

what do you charge for the booster mounting bracket? I will take some pics of what I have done tomorrow to show what I have done and if you can make any suggestions. Thx! Dan

[Captainfab]

The price is exactly the same as in post #1 of the for sale thread.......link is in my sig line \/ \/ \/

Originally Posted by DMO

what do you charge for the booster mounting bracket? I will take some pics of what I have done tomorrow to show what I have done and if you can make any suggestions. Thx! Dan

If the rear calipers are not flowing much, the valve inside the combo valve may have slid over and blocked the rear circuit. It will need to be centered again.

[jweb]

This may not be your problem but there is a tool you need when you are bleeding your brakes for the proportioning valve.
https://www.performanceonline.com/Co...ve-Bleed-Tool/

[fleetsidelarry]

Originally Posted by Captainfab

If the rear calipers are not flowing much, the valve inside the combo valve may have slid over and blocked the rear circuit. It will need to be centered again.

DMO, this is from my Master Power Brakes literature, may help if what Captainfab is saying is the case:

[DMO]

Thanks to all for the help with this. As it turns out the MC is leaking and has to be replaced. Here is the problem I don't know the type of booster I have. It's a short pocket booster but that is all I know. I know I need a short pocket MC but any suggestion on bore size?

[zach_carver]

Originally Posted by DMO

Thanks to all for the help with this. As it turns out the MC is leaking and has to be replaced. Here is the problem I don't know the type of booster I have. It's a short pocket booster but that is all I know. I know I need a short pocket MC but any suggestion on bore size?

Im having the same issues.. What kind of master cylinder are you using? Very aggravating I know. Mine is fine until I start the truck then pedal has little to no resistance and goes to the floor.

[fleetsidelarry]

DMO-did you get it figured out?

[Moarplease]

Don't forget to correct the pedal ratio when adding a booster to a previously manual setup.

Adam

[statenine]

Originally Posted by DMO

Thanks to all for the help with this. As it turns out the MC is leaking and has to be replaced. Here is the problem I don't know the type of booster I have. It's a short pocket booster but that is all I know. I know I need a short pocket MC but any suggestion on bore size?

I think typically a 1 1/8" bore is recommended when using a power booster. Thats what the guys and CPP told me anyways