Imup5-0
Newbie
Can anyone tell me if the jb7 master cylinder will work on the jb5 booster or do I need the jb5 master and booster? I cannot find a definite answer
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JB5(6400lbs):
1.574" Bore MC
Low Drag Calipers 2.935" Piston
Front Disc- 11.86x1.29
Rear Drum- 10x2.25
Vacuum- Double Diaphram
1 3/16" wheel cylinder
JB6(7200lbs):
1.574" Bore MC
Low Drag Calipers 2.935" Piston
Front Disc- 12.50x1.28
Rear Drum- 11.15x 2.75
Vacuum- Double Diaphram(same as JB7)
1" rear wheel cylinder. 11' drum has self activating shoes, therefore does not require as much pressure as the 10"
JB7(8400lbs)Single rear wheel:
1.25" Bore MC(used in JB5 and JB6 Hydro Units)
Conventional Calipers 3.15" Piston
Front Disc- 12.50x1.54
Rear Drum- 13.00x2.50
Vacuum- Double Diaphram(same as JB6)
1 1/16 rear wheel cylinder
It will bolt up but if you have the low drag calipers you will most likely not notice any big difference in pedal travel
I plan to upgrade to the jb7 mc and calipers. That's exactly why I needed to know if the jb7 mc would work with the jb5 booster. From my understanding the jb7 calipers are all conventional(not low drag). Am I correct to think this?