Quote:
Originally Posted by brillo_76
Ok.. Makes since. Which caliper uses the 231mm?? As I thought it was the 13WL?
So the OP should be fine with the calipers being 13WL provided everything else is in good working order and no air in the system. Since the movement of fluid is the same and all the pistons are the same size using the surface area of fluid to push. So all these spongy pedals are just air in the system? Interesting learn something new everyday. :-)
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The 13WL caliper is the 231mm. BigFishAllDay explained the difference between the two really good in his write-up:
"The mechanical difference boils down to the updated caliper being much larger to hold a larger pad....The early style pad (in the 13WE caliper) will be less than 5” (4-11/16” or 199.5 mm) in width; the (pads in the) later update (13WL caliper) is more than 5” (5-5/16” or 231 mm)."
This is referencing the brake pad backing plate, but the brake pad material is very close between the two as seen in this post:
https://www.toyota-4runner.org/3378920-post1.html
I think what people are saying is a "spongy feeling brake pedal" is really just the nature of the brake system due to an increased piston size in the front calipers. Some cases could be air still in the system or old fluid that has absorbed too much moisture. When the caliper piston size increases then the master cylinder has to move further in order to make up for the added piston volume. This means the brake pedal is easier to push and must be pushed further. Some people will notice it and some people won't. It definitely depends on the driver. I borrowed my dad's car the other day and it shakes horribly, but my dad didn't notice it at all.
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