Almost time for new brake pads and rotors

[MN4runnerman]

If that's the case then the two measurements (199, 231) refer to the caliper width and directly relate to Breaking surface area, pad to rotor.

what BFAD Illustrated in his thread regarding critical measurements of the TBU, the thickness of the rotor is what's preferential between the two vehicles, but the braking surface area is directly related to size of the pad, so it seems the 199 TBU is only going to be a percentage more effective over stock 16" 4Runner brakes versus the 231 TBU

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It’s a noticeable difference from stock to 199 in my personal experience. The stock 16” rotors and pads on my 99 were fairly new too. I’m happy with both upgrades. But I think it really helps to make sure your rear brakes are all properly adjusted which I think you already did.

 

[theesotericone]

Uh shucks man, you should know by now that half (3/4?) of what I say here is tongue in cheek . The "coolaid" reference was not meant to be derogatory but loving, sort of like on this forum everyone catches the "must have a Sport Hood" or "must have '99 console" fever... Look at my sig, I caught both of these and more, and no doubt there is a TBU in my future as well, I'm just trying to stay in that big river in Egypt a bit longer.

What size TBU do you have? (real men always talk sizes)

I know that you are joking because of the interaction we have on the forums. The guy who reads this after a google search 5 years from now may not. That's the reason for my post. And octane was correct. Jimmy used cyanide laced grape Flavor-Aid. If I was Kool-Aid I'd be pissed about the revisionist history that occurred with this one. lol

I have 231's.

If that's the case then the two measurements (199, 231) refer to the caliper width and directly relate to Breaking surface area, pad to rotor.

what BFAD Illustrated in his thread regarding critical measurements of the TBU, the thickness of the rotor is what's preferential between the two vehicles, but the braking surface area is directly related to size of the pad, so it seems the 199 TBU is only going to be a percentage more effective over stock 16" 4Runner brakes versus the 231 TBU

Here's a quote from the first page of BFAD TBU 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). Both of the calipers have the same dimensions on the mounting bosses......The update (to 13WL calipers) will replace the (13WE) calipers with a larger set that will provide additional swept area and fluid capacity for heavy-duty use.

What I found interesting is the mm conversions are incorrect.

199mm=7.83"
231mm=9.09"

I know BFAD has a lot of measurements comparing the stock caliper to the 13WL. There's no comparison of 13WE to 13WL though. After looking at some other threads people have used to 13WE caliper kit to rebuild 13WL calipers so that should mean the calipers are the same.

So what's the real difference in the 199 to 231 size? I don't know but bigger is always better. lol

 

[octanejunkie]

Jimmy [Reverend James Jones, Guiana] used cyanide laced grape Flavor-Aid. If I was Kool-Aid I'd be pissed about the revisionist history that occurred with this one. lolllll

Kind of makes you wonder about the idiom "drank the Kool-Aid" and what was actually being referred to, or is this another attempt at clever marketing/spin to promote commercial products regardless of the social significance or accuracy of the reference? [emoji848]

Bigger is better except when talking about golf scores or tumors, so be careful what you wish for[emoji3]

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[AntleredRuin]

No technical measurements (but I know I've seen them somewhere), but...

As already mentioned, the rotors are the same size from 199mm to 231mm; it's just the caliper that's bigger and more powerful.
Actually just checked from Advance Auto's site. Compared a V6 2000 Tundra (199mm)to a V8 2005 Sequoia(231mm) and they are offered the same rotor.

The larger caliper is why you need larger wheels (or wheel spacers or grinding).


I've read that the 199mm offers negligible performance upgrades compared to a well maintained (good pads, rotors, proper brake fluid, bled properly, etc) stock setup. Supposedly very similar in braking power to a Limited with 16" wheels (the Limited T4Rs came with larger factory brakes).
The real perks behind the 199mm is the thicker rotor that resists 'warping' longer. It's the 231mm that's actually an upgrade with real increased braking power.

I have a Limited with 16" wheels and the better factory brakes, but they were shot to hell. 'Warped' rotors like crazy, and the pads were near nonexistent (to the point where the ABS light was on because my brake fluid was 'low').
So my upgrade from pretty much no front brakes to the 231mm was night and day. I also took the time to completely flush the brake lines and bleed them properly, so fresh DOT4 brake fluid sure helped.


I've not had any ABS issues at all, but I live in Houston (read almost 0% snow and ice ever). I also have a '99, which I know has the redesigned ABS. '96-'98 had a lot of ABS issues, even without the TBU.

 

[PRG3K]

I also have a '99, which I know has the redesigned ABS. '96-'98 had a lot of ABS issues, even without the TBU.

What issues would come up? I'm thinking of doing this on my '98.

 

[AntleredRuin]

What issues would come up? I'm thinking of doing this on my '98.

I've read that they are very over-zealous. Kicks in when you really don't need/want it, and causes some loss of control. Usually worse on ice or similar.
Just what I've read; there's a bunch of threads on it.

 

[Xntrik7]

OEM Pads

I just got the OEM 04465-35240 installed when I had the OEM rotors turned (109k miles) on Friday. I’ve been very impressed with the performance so far. Much better brake pedal feel and smooth braking.

These pads replaced ceramic pads that were installed when I bought the truck with 61k in 2012. They still had over 50% of life left. The ceramics required a little more foot pedal force to slow down though (could’ve been solved with another brake bleed?).

I hope this helps.

Cheers,
Dan

 

[octanejunkie]

I just got the OEM 04465-35240 installed when I had the OEM rotors turned (109k miles) on Friday. I’ve been very impressed with the performance so far. Much better brake pedal feel and smooth braking.

These pads replaced ceramic pads that were installed when I bought the truck with 61k in 2012. They still had over 50% of life left. The ceramics required a little more foot pedal force to slow down though (could’ve been solved with another brake bleed?).

I hope this helps.

Cheers,
Dan

Thanks Dan, I've read OEM pads are ceramic - not sure that's a fact

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[jgue467]

Did you get those new pads on yet? I Love mine, smooth and strong. :cowboy:

 

[octanejunkie]

Did you get those new pads on yet? I Love mine, smooth and strong. :cowboy:

Had to reorder the pads, Amazon messed up. I haven't installed them yet.

 

[TOYU TA]

No, those warped long, long ago!

The stoptech pads i mentioned are being used with stoptech rotors (slots only no drill holes) and angled vanes for better cooling (so the rotors are Left and Right designated). So far, no warping on long downhill braking. :cowboy:

Would you happen to have part numbers?

 

[96RedRunner]

[MENTION=95183]octanejunkie[/MENTION] since your going to have fresh rotors and pads are you going to bed in those new pads?

 

[octanejunkie]

[MENTION=95183]octanejunkie[/MENTION] since your going to have fresh rotors and pads are you going to bed in those new pads?

I put them under my pillow, so yes, you could say I bed them in :angel:

But seriously, yes I will

 

[96RedRunner]

:clap2: Leave nite light on
Some folks don't know about bedding process, thought I'd mention it.

 

[Jason B]

Thanks Dan, I've read OEM pads are ceramic - not sure that's a fact

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I was told this too. The OEM pads, 04465-35240 around $80 not the az budget pads, are made by akebono and I think their are ceramic. And don’t give dust?

 

[96RedRunner]

[MENTION=9]Jason B[/MENTION] indeed, running those pads since 2017 have performed well little wear no dust.