Question, would 19'' wheels cause my car to brake differently?

[JRoldy]

Originally Posted by wparsons

If the pedal is hard, bleeding the brakes won't do anything.

Are the pads glazed over? After I overheated my OEM pads it took more pedal force to stop the car than before, and when I took them out they were really glazed/shiny.

If they are and the car was purchased new I would be asking the dealership how this happened since a PDI drive shouldn't be pushing the car hard enough to overheat/glaze the pads like that.

:happy0180:
Glazed rotors and pads could definitely cause brake performance fade, in turn would also cause noise if lightly applied. (light squeal)

[Mr.Zoolittle]

Update-

The rotors and brake pads were replace by a Scion dealer. The problem is gone, car now stops as it should!!!

[SillySaxon]

Keep change within 3%
http://www.1010tires.com/Tools/Tire-Size-Calculator

[djdnz]

Originally Posted by Mr.Zoolittle

Update-

The rotors and brake pads were replace by a Scion dealer. The problem is gone, car now stops as it should!!!

Did they say what was wrong with them? Curious.

[Mr.Zoolittle]

they didn't say, they claimed nothing was wrong with them. They were glazed over.

[yoshiharadesign]

Good to hear it was something replaceable. With regards to 19s. Our position relative to FRS despite us having 19' available is this: It is not the ideal set up for the FRS chassis. The maximum we would recommend is 18 in terms of tire/ wheel weight vs gains in cornering vs acceleration. 18" in a select size along with an optimal tire size would prove optimal in enhancing the performance instead of degrading it. Ultimately though any tire/wheel upgrade usually means trade offs as the enhancement envelope has shrunk tremendously over the years from car makers who are making better cars as stock.

[Vracer111]

19" S5F Five Axis wheels are HEAVY... over 30lbs from what I can find...better than stock pads and discs would be highly recommended for those wheels if you want to stop better and keep from glazing the pads/rotors.

Any increase in unsprung mass is a decrease in performance of the brake system as it has to work harder to slow down the increased mass...and if that mass is moved further out with 19" wheels, well that's even more torque put into the system. As Yoshiharadesign pointed out 18"s are a nice compromise with a properly designed wheel.

I can tell you this though, you can tell the difference in ride and comfort from just changing out the stock wheels to lighter ones and keeping the stock tires...less unsprung mass = less force being put into upsetting the chassis, which gives a better ride. To me the stock wheels are heavy for a 17x7 wheel, coming in at 20.6 lbs (weighed less valve stems/TPMS) - going to a 17x7.5 wheel that weighs 17.1lbs has a very noticeable increase in ride quality.