CPP 73-87 brake booster combo question

[naphtali5725]

hey all, i have an 86 1/2 ton. i want to replace the brake booster/MC/PV on my truck because i switched from the JB3 code to JB5 code hardware (drums/rotors/calipers/wheel cylinders)

my question is. will this CPP combo work for my truck?


cpp part number 7387BB-MC

https://www.summitracing.com/parts/clp-7387bb-mc

called their tech line, they said it is an 11 inch single diaphragm...

or should i just buy the factory parts?

[Bloodhound]

Originally Posted by naphtali5725

hey all, i have an 86 1/2 ton. i want to replace the brake booster/MC/PV on my truck because i switched from the JB3 code to JB5 code hardware (drums/rotors/calipers/wheel cylinders)

my question is. will this CPP combo work for my truck?


cpp part number 7387BB-MC

https://www.summitracing.com/parts/clp-7387bb-mc

called their tech line, they said it is an 11 inch single diaphragm...

or should i just buy the factory parts?

I just installed that on my 1981 C10. I'm a ways from driving it but the quality appears to be really good. I believe it would work well with the JB5 brakes.

[WyattTX]

It will likely work, but you may have to adjust the pushrod in the booster, otherwise your pedal may be soft when the engine is running.

[naphtali5725]

Originally Posted by Bloodhound

I just installed that on my 1981 C10. I'm a ways from driving it but the quality appears to be really good. I believe it would work well with the JB5 brakes.

my concern was the JB3 brakes have a single diaphragm booster, JB5 has a dual diaphragm booster...

since this is aftermarket, i was looking for some feedback from someone who has used in this scenario..., if this one, being a single diaphragm, is it equal to a dual as far as power is concerned?

[naphtali5725]

went ahead and ordered factory replacement BB and MC from rockauto

[WyattTX]

Good luck, and dont forget to bleed the master cylinder too.

[demian5]

Originally Posted by WyattTX

Good luck, and dont forget to bleed the master cylinder too.

BEFORE you install it in the truck.

[sweetk30]

do NOT bench bleed them with the stupid plugs they give you now a days . get a hose kit or make your own from 2 hard lines and a extra set of hard line nuts .

i did one with the plugs and it never felt right clamped in the bench vise using a long screw driver to plung it . took them out and did the hard lines i had ( had to go looking for them ) and the unit belched so much air it wasnt funny . felt super after this . installed and bleed system good to go .

[WyattTX]

Originally Posted by sweetk30

do NOT bench bleed them with the stupid plugs they give you now a days . get a hose kit or make your own from 2 hard lines and a extra set of hard line nuts .

i did one with the plugs and it never felt right clamped in the bench vise using a long screw driver to plung it . took them out and did the hard lines i had ( had to go looking for them ) and the unit belched so much air it wasnt funny . felt super after this . installed and bleed system good to go .

Are the plastic nipple, and hose bench bleed kits from the parts store any good, or should I make some hard lines like yours? I may be replacing a master cylinder myself soon.

[sweetk30]

just dont use the solid cap plugs . most any hose kit or if you do a few more than the average guy then i like hard line .