Brake Issues With TBU

[jmoskow]

OP out of curiosity, do you find that when you press the pedal when moving - take your foot off the pedal and then quickly press it again that it firms up?

If so, I have a nearly identical scenario going on with mine post TBU.

Just for documentation purposes, I went with the PowerStop KC2324 Z23 daily driver set up with Rotors, pads and calipers and StopTech 95044007 lines.

FWIW With this set up, the rotors were thicker (but same diameter as OE), the calipers larger (had to trim dust shield) and in turn the pads were larger as well. (I am not sure if this set up was 13WE or WL if I am being honest)

It stops. It will stop short. The shudder from the original warped rotors is now gone. But the OCD in me knows the pedal was firmer on the OG set up then it currently is, aside from quickly pressing the pedal the 2nd time when braking. That seems to have a more original feel for me.

That said, I am going to anxiously follow this.

I chalked it up to mine being an 01 with ABS and some people just seemed to have a different pedal after the TBU and dealt with it. I'd love to get to the bottom of it myself.

Wondering if you ever figured this out. I just did the TBU on 2000 SR5 4x4 Manual. WL calipers (Power Stop KCOE2324 kit) and have exact same symptoms you describe. First brake pedal press is longer & feels more mushy than before but second brake pedal press feels firm. Stopping power is good regardless. My rear drums are properly adjusted and brake lines have been bled many times.

 

[phattyduck]

My rear drums are properly adjusted and brake lines have been bled many times.

Between those many bleedings did you get the ABS system to activate? There is likely a small bubble in the ABS unit that needs to get out of there.

Sadly, there is no way to trigger the ABS system from a diagnostic port (the factory system at the time was a separate box that plugged directly into the ABS unit...). Get out to some dirt/gravel/snow/ice and activate the ABS and bleed again. It might even take more than one time...

-Charlie

 

[Dan MacMedan]

It's been a while, but did this issue ever get resolved? I have the 13WE's and absolutely no issues with great pedal feel.

 

[brillo_76]

I done 2 tundra brake calipers with the smaller ones 13WE on a 1997 and 1998 zero issues. Air in the ABS is probably causing the soft pedals.. These are my favorite caliper because it uses the same brake pad as stock and fits most 16 inch rims.. You go with the larger caliper they will not fit most stock 16 inch rims and in my opinion super way overkill.. As they are just for more air flow around the rotor.. That is it and if you look the backing is the only part longer the pad material is basically the same size as the stock pads.

 

[jmoskow]

Between those many bleedings did you get the ABS system to activate? There is likely a small bubble in the ABS unit that needs to get out of there.

Sadly, there is no way to trigger the ABS system from a diagnostic port (the factory system at the time was a separate box that plugged directly into the ABS unit...). Get out to some dirt/gravel/snow/ice and activate the ABS and bleed again. It might even take more than one time...

-Charlie

Thank you! Shouldn't be hard. Lots of snow and ice here!