Originally Posted by BKyota

Looking to source these parts now. Looking at Rock Auto. Can anyone vouch for this purchase option?

Rock Auto
POWER STOP KCOE2324 Stock Replacement Kit ;
Front; With Front Caliper Casting 13WL

Price is $203.99 (After core refund) for both sides, rotors, calipers and pads.

Originally Posted by BKyota

so I have the 2001 "flower" 5 spoke wheel. Im to solve the issue of the stock spare not fitting with the large 13WL brake caliper Im thinking of ordering a used additional flower wheel from ebay. Wondering if I can hang it in the same spot with the current spare hangs under the car?

Originally Posted by jsclimbs

I have a set of calipers and rotors from a 2006 Lexus GX 470.
The stamp on the calipers is 13WH. Is this set up going to fit a 99 $Runner?
I don't think it will, but i got them for free.

Originally Posted by msimcoe

Interesting observation re the size of the 199 pads and the 231 pads being the same (see post #1138). I would guess the 231mm rotor would dissipate the heat better since it has more area and mass. I have the 16" 3rd Gen split 3 spoke wheels which I don't think will fit with the 231mm upgrade. So, the 199's may be my only option assuming I don't upgrade my wheels. In any event, if you want more stopping power, your not towing anything, and you have a RWD 4Runner like I have that weighs less than the 4WD then I would think the 199's would be fine. In my case I'm not sure how much extra stopping power I'm going to get with the 231's over the 199's. I mean 4mm doesn't seem like much. Like I said I think the main benefit of the 231's over the 199's is the bigger rotor not so much the caliper especially given your observation re the pads.

Originally Posted by Thebeastlives

After adding the 231 mm brake setup did any of you need to replace your master brake cylinder? The brake pedal seems a little softer than stock.

Originally Posted by JZiggy

Regarding the TBU for base model 4Runners, I wanted to make a comment about pedal effort.

Your brake system is a hydraulic lever. The master cylinder has a 1" diameter piston and the effective area of the calipers and wheel cylinders it much greater, approximately 20:1 This is analogous to mechanical leverage (pull on a 1" wrench vs. a 20" long wrench).

The hydraulics don't care how big the caliper or the rotors are, only the size of the pistons. 4Runners with 15" wheels had calipers with 43mm pistons (S12xx casting) but 16" wheelers had 45mm pistons (S13xx casting). The 199mm and 231mm Tundra calipers both has the 45mm pistons. So if you upgrade from an S13xx to another S13xx casting caliper your hydraulic advantage has not changed.

I'll spare you the math, but I found that going from S12 to S13 calipers and from 15/16" to 1" wheel cylinders increases the hydraulic leverage by 10%. I found, even after thorough bleeding, that the pedal is softer. Not spongy, but just that it takes less force to actuate the brakes. This is why, the lever is 10% longer.