Rear drums...are they really all that cool?

[ntsqd]

I finally got around to looking it up in my brake ratios spread sheet. The total leverage ratio is calculated by taking the ratio of the master's piston area divided into one side of the caliper's piston area, and multiplying that result by the brake pedal ratio. Since my 60 is too far away to measure I'm going to make the assumption that it's pedal ratio is the same as that of the pedal in my Xcab Mini. This may or may not be a safe assumption. I'll try to remember to measure the pedal tomorrow and adjust these numbers accordingly.

Stock FJ60 Calipers & M/C: 62.8:1
4Rnnr Calipers + FJ60 M/C: 70.4:1
4Rnnr Calipers + FJ80 M/C: 53.5:1

The bigger the number, the easier the brakes are to apply. That is, less pedal effort is needed to stop at some set rate. The smaller the number the more pedal effort is needed. People frequently confuse a system with a low total leverage number as having really good brakes. This is because the pedal feels very firm, which is a good thing. Unfortunately it also means that the effort level is quite high, which for most is a bad thing.

Summation: do the 4Rnnr caliper swap first, then if the pedal is too soft or travels too far for your liking swap back to stock calipers. The FJ80 MC swap combined with the 4Rnnr calipers is worse than stock.

 

[Mace]

That's why you do the 4Runner front caliper and 80 series master cylinder upgrade first

Gee, if you get 4 of the TG six shooters you could add a caliper to both sides of the rotor increasing braking by 50%!!!!!!

 

[cruiser88]

Gee, if you get 4 of the TG six shooters you could add a caliper to both sides of the rotor increasing braking by 50%!!!!!!