Marlin crawlers big bore master cylinder (1 Viewer)

[Alron67]

Hi forum has anyone given the marlin crawler big bore master cylinder a try? Finally got my brakes to have acceptable pressure and pedal feel after flushing the system with a home brew pressure bleeder. But if the big bore would further increase the pedal feel and clamping force it seems like a win win. Any thoughts?

Big Bore FJ80 Brake Master Cylinder | Marlin Crawler, Inc.

 

[Tools R Us]

How would a stock master be "big bore"? If it were oversized, it would reduce braking power.

 

[baldilocks]

How would a stock master be "big bore"? If it were oversized, it would reduce braking power.

Your leg would have to do more work by at least the brakes would work before your foot was an inch from the floor.

 

[Douglas S]

From the description it sounds like this master is stock size for an 80, but oversized for a 4runner or mini truck.

 

[pappy]

From the description it sounds like this master is stock size for an 80, but oversized for a 4runner or mini truck.

The description is very clear.

This is a genuine Toyota 1990-97 FJ80 Land Cruiser Brake Master Cylinder. This fits all FJ80 Land Cruisers …

 

[NLXTACY]

What it *should* say is, “stock FJ80 master cylinder” with subtext of, “big bore option for 60Series and mini-trucks with 4Runner calipers”.

As Tools pointed out, you can’t just increase the bore size of the master without compensating for the hydraulic movement elsewhere in the system.

 

[Alron67]

From the description it sounds like this master is stock size for an 80, but oversized for a 4runner or mini truck.

Ahhhhh I get it. Thanks

 

[maxamillion2345]

Why do you need a bigger bore? Stock brakes?

There is a T100 1 1/16" master out there but you shouldn't need that unless you've gone to bigger calipers. In fact it'd probably do the opposite of what you're after and make the brakes harder to press, giving you less pressure, and the brakes not working as well.

 

[pappy]

There is a T100 1 1/16" master out there but you shouldn't need that unless you've gone to bigger calipers. In fact it'd probably do the opposite of what you're after and make the brakes harder to press, giving you less pressure, and the brakes not working as well.

Which is what Marlin says. It's a common upgrade on solid axle mini-trucks to ditch the solid rotors, install vented FJ60 rotors and larger V6 calipers … all result in the need for the 1" master cylinder.

On 1979-1985 Trucks and 4Runners the smaller factory bore works fine with stock, solid front rotors and 8" rear drums. If you upgrade the rear to larger 1986 and up, 10" drums and/or upgrade the front to a vented style caliper you will want to install a 1" bore master cylinder like this one for additional volume.

 

[maxamillion2345]

We're not talking about mini trucks. This guy wants a bigger master. Why?

 

[pappy]

We're not talking about mini trucks. This guy wants a bigger master. Why?

I believe he has conceded he doesn't.

Ahhhhh I get it. Thanks

 

[maxamillion2345]

He understood that the master sold by marlin is the same master he has, seems like he wants a bigger master though.

Which again, for reference, there is a 1 1/16 from a t100 that will bolt up but unless you're running bigger brakes on your 80 series you don't really need a bigger bore master and itd probably just make the pedal harder and apply less pressure to the calipers.

...thanks for your help though