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521 front disc swap...master cylinder? Proportioning valve?


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When I got the truck the po had the beebani brackets and pathfinder brakes...I got in the deal so I've got the brackets rotors and calipers all mounted up but I've heard different opinions on master cylinder options is it possible to use the stock single master that's in the truck? Is a proportioning a must... will I be locking the rears without one? Any info or opinions or part numbers would be a great help thanks

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yes. need proportioning valve.  dual master also. 7/8  15/16 (recommended) or 1" wilwood.  you can get away with changing the valve on the rear circuit, but more adjustment with PV.  good to run new lines also. just did mine over the weekend.

 

20150524_202407_zps6da35cb8.jpg

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^^^ you did?? I see no thread update.??

 

 

When I got the truck the po had the beebani brackets and pathfinder brakes...I got in the deal so I've got the brackets rotors and calipers all mounted up but I've heard different opinions on master cylinder options is it possible to use the stock single master that's in the truck? Is a proportioning a must... will I be locking the rears without one? Any info or opinions or part numbers would be a great help thanks

What he said.

 

I have a different set up but I feel the wilwood master was to stiff. But it probably would be different if you had rear disc as well, also wouldn't it make a difference if the brake calipers are single or duel piston??? Idk.

 

I went with the 15/16 master after having the 1 inch wilwood master cylinder.

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i have the 7/8 on my set up. its too soft for me and feel like i have to double pump pedal to get it firm. planning on doing the wilwood.

I have the z32 calipers and the rear isuzu disc as well so i think the more displacement would be better for my set up.

the issue with going 15/16 is that no one has them anymore and a lot of the ones at the jy cannot be salvageable. 

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he 3/4" will still work but with larger calipers you have to move more fluid and the pedal will travel further. This will feel mushy, but the brakes will work well. Going to a larger master will move more fluid but will take more effort to get the same pressure as the 3/4". This is the 'You Can't Get Somthin' For Nothin' law. If going to a larger master, keep it a small increase, or install a brake booster from a 620 or B-210.

 

If you have rear drums get a rear drum master.  If you get something like a 15/15 from a zx or Maxima it will have rear disc brake residual valves in it. Just swap your rear residual valves or get one from another Datsun with rear drums. Naturally if you swap in rear disc brakes swap a rear disc brake residual valve into your master if it originally had rear drums on it.

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The early L16 620 had 3/4" and I'm sure the 521 was 3/4".

 

I had 3/4" on my 710. Put Maxima calipers and the 15/16" master on. That's a jump of a whole 3/16" in diameter! It does have a brake booster. The pedal remains unchanged in effort, the rears don't lock up and the braking is breathtaking. 

 

If your back drums lock too soon loosen the adjustment off slightly.

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