Spongy brake pedal on Track

char

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I brought my Supra to Laguna Seca racetrack last weekend. The car felt great on track without any engine cooling issues but I experience some issues with the brake. I already heard the OEM brake pads do not work great on track driving so I changed to RBF660 fluid with CSG Spec CP pads on both front and rear. However the pedal become soft after 5-6 laps and the travel become longer. I tried to run 1-2 cooldown laps but the situation did not improve itself. I can feel the pedal almost went to floor without increasing the foot force when I braked before the turn 2. The brake recovered when I parked the car for more than 30 mins. My car is stock except for the fluid and pads change.

I know Laguna is hard on brakes but I don't think I can boil the fresh fluid in such short time. But if the brake pads fades, I should have a firm pedal but require higher foot force to stop the car, which was not the case I experienced.

Does anyone experience the same issue? What's your solutions?
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racer01

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I had the same issue with stock pads at my first track day at Virginia International Raceway. Fluid not boiling, but hot pads starting making for a very long pedal. My research showed that the CP pads would help some but would eventually do the same thing (long pedal from pads going past their temp range). I went straight to the C2 full race pad material and Wilwood exp 600 plus which worked very well at my next track day....solid pedal all day and great modulation even when hot. Used C2 front and stock rears, and I didn't seem to overheat the rears but this last track day was at Roebling Road Raceway which is relatively easy on brakes.

The CP is a dual purpose pad, and probably ok on a light car or a track easy on brakes. Laguna in a Supra is neither...heavy car and one of the hardest tracks in the USA on brakes! All dual purpose pads I have ever tried eventually fade with serious track use. Laguna is a torture test for brakes, and you may even have heat problems with dedicated track pads running hard for 20 min sessions.

I know it isn't my $$ but I'd keep the CP's front and rear for the street and just swap in C2 fronts for track days. They have compatible pad material and the C2 is actually pretty good on the street except for dust so you can swap them at home and drive them to the track. I didn't have any noise or lack of friction even when stone cold.
 
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char

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I see, thanks for sharing your experience.
Did you short your brake pad sensors, I found them very annoying if I need to change the pads often for track days. I am wondering if there is any bypass device for that I can use on this car.
 

racer01

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I pulled the pad sensors off the stock pads and onto the CSG pads (then back onto stock pads after track day). Wasn't any trouble, just careful to pull carefully from the plastic sensor not from the wire. You can zip tie them up out of the way for a track day if your track pad doesn't have the cutout for the sensor.
 

SUPRATOY

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I just pulled them from the pads and zip tied them to the junction box... that way avoid the issue of shorting them and have a warning light on.. never had a need for them in the past... don't see why the need now!!
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