Larger Brake Master Cylinder options- 95 4Runner w/ABS?

[supra90mkiii]

If you were to put dual piston calipers from a previa (the ones that bolt-on) would that cause the front brakes to have an unequal amount of braking force compared to the stock braking force? (will the fronts lock up before the rears?)

 

[cjsupra90]

I wonder if 4 pistons in the back would require a larger MC. In addition to the BBK up front, obviously.

It all depends on how its sized.. If sized correctly, then no it wouldn't.

Once I finally get around to finnishing my rear setup, I will then have 6pot on the front and 4pot on the back and with a stock M/C, will still have a better feel and stiffer peddle.

 

[twinturbozs]

UPDATE: the resevoir on the 95 4runner does not match up with the MKIII. Its approximately 1/2" too short. The hardlines do match up along with the 4 bolts. I didnt have a 4runner resevoir so i was unable to install it.

 

[MDCmotorsports]

Ive tried the 4 pot 4runner calipers. Toooo much work and machining required compaired to a custom Willwood or Brembo kit.

 

[NashMan]

naa they will nto work at all withc out spacering you front wheel's witch is retared and dumb

Ive tried the 4 pot 4runner calipers. Toooo much work and machining required compaired to a custom Willwood or Brembo kit.

 

[twinturbozs]

Update:

I located a 1995 4Runner MC w/ABS and it bolted up correctly. You'll need the 4runner resevoir, fortunately our fluid level cap works for the resevoir too, but you need to keep the resevoir topped off as the sensor sits a bit higher than stock.

I cant say i noticed a huge difference in pedal feel with my Precision Brakes though.

 

[Twigger]

I cant say i noticed a huge difference in pedal feel with my Precision Brakes though.

Is that a positive or negative feel?

 

[twinturbozs]

I ended up adjusting my pushrod too, but i havent completely eliminated a slight spongy feeling in the pedal. im not sure what the problem is now. This is my 4th MC installed, ive gone through 5 mechanics who bled the lines themselves.

 

[limequat]

There is no need to go to a lager bore master cylinder. For one, doing so will lower the pressure output for the same given peddle effort and therefor you will have to push harder to equal the same M/C output pressure,

I think you have this backwards. Pressure = Force x Area. Increasing the area increases pressure for the same force. It makes sense to go to a larger bore master for better pedal feel.

 

[drjonez]

Update:

I located a 1995 4Runner MC w/ABS and it bolted up correctly. You'll need the 4runner resevoir, fortunately our fluid level cap works for the resevoir too, but you need to keep the resevoir topped off as the sensor sits a bit higher than stock.

I cant say i noticed a huge difference in pedal feel with my Precision Brakes though.

you may want to disassemble the MC and measure to see if you're actually gaining anything....

 

[IJ.]

I think you have this backwards. Pressure = Force x Area. Increasing the area increases pressure for the same force. It makes sense to go to a larger bore master for better pedal feel.

CJ has it right.

Smaller Master = less pedal effort but longer stroke/spongy "feel"

Larger Master = more pedal effort but shorter stroke/improved "feel"

On my 240z I deleted the Booster and did it all with mechanical advantage and used 2 single circuit master cylinders that I had sleeved down to accept the piston size I'd calculated would give me the best compromise then used an adjustable proportioning valve to compensate for full (120litres) to empty tanks.