Quote:
Originally Posted by Bad Luck
I disagree. The 231 brake pad backing plate is bigger than 199 brake pad backing plate, but the brake pad material is very close to the same size between 231 and 199 (at least for OEM pads). You can see the two side by side in this post: https://www.toyota-4runner.org/3378920-post1.html The 199 and 231 brake calipers both have the same size pistons. I do think the larger rotors are the biggest advantage to either upgrade.
Side rant: A lot of people complain about a softer pedal, but that's just how hydraulic systems and fluid dynamics function. When you increase the brake caliper piston size you increase the amount of fluid required to move the piston out the same distance as the smaller OEM caliper piston which is why people complain of a softer/lower pedal. In order to keep the same pedal feel/distance you would need to increase the master cylinder piston bore proportionally to the brake caliper piston increase.
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I compared my brake pads coming off to the ones that were going on and they are larger. No photo but the pads are both longer and wider. I would have been disappointed if they were the same size! I don't know for sure that the 231mm are bigger vs the 199mm pads, but it would seem rather silly for Toyota to put on bigger calipers with the exact same pad size. I don't know of any advantage of doing that.
I didn't have the soft pedal, maybe mine was already soft to begin with? I have heard of many complaining about it though. These brake lines can also be tricky to bleed, I didn't get a good bleed until I did it with the engine running and I have the old brake booster system, not the brake pump system that was introduced in 2001.