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SRT Hellcat Enthusiast/Owner
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Discussion Starter #1
Did you change the brake fluid and use the stock brake pads? I am getting the car prepped to take it on a road course and want to know if there's a better brake fluid for the track that I can also drive on the street. Thanks in advance.

Steve
 

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Track in, Apex, Track out and Repeat!
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Steve:

I've used Motul Dot 4 in the past....I now use Castrol SRF. Seems the Castrol has less thermal expansion than the Motul in my applications. YMMV. In any event.....definitely ditch the Dot 3....you'll be boiling that stuff in short order on the track.

Wayne
 

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There are several threads about this but I'd change your brake fluid to either Motul or Castrol. Your stock pads should do fine your first few times out.

Consider checking your power steering fluid level. If it's near the full mark it may spew out the top some, making a bit of a mess. You should be able to take a little out or put something like a sock over the cap to absorb what may come out.

If your brake pads seem to fade (long but not spongy pedal) after some high speed stops let them cool down for a couple of laps and then go back at it. They need to be burnished and then they should return and be good to go.
 

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Discussion Starter #4
Thanks guys! Much appreciated...how does the car drive on normal roads with the DOT 4? The same as stock?
 

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Just keep in mind.....Dot 4 fluid, in general, is hydrophilic. It wants to absorb water. So you should change it frequently as water contaminated fluid won't function like Dot 4 fluid and can cause damage to your brake components. I swap mine out every year....but I'm on the track a couple times a season and put maybe 2,000 miles on each vehicle. Other guys, who track on a regular basis will probably swap fluid a couple times a season.....seems to correspond with pad changes.
 

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Discussion Starter #7
Just keep in mind.....Dot 4 fluid, in general, is hydrophilic. It wants to absorb water. So you should change it frequently as water contaminated fluid won't function like Dot 4 fluid and can cause damage to your brake components.
How frequently would you suggest?
 

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How often will you track the car and how many miles will you put on it? Also, it probably makes a difference if you are in a very humid environment versus dry. I'm very happy with once a year, but I'm in Minnesota.....haven't had a single issue with my components. If you are tracking every weekend and putting a lot of miles on....I would probably change fluid with my pads. So, if you need two or three sets of new pads a year....I would consider new fluid with the new pads. You don't want to cut costs when it comes to brakes on a road course. You really need to have confidence that your pedal is going to feel the same and perform the same...lap after lap. And a spongy pedal or one that needs to be pressed to the floor......well....let's just say it takes away the enjoyment of driving on the track:)
 

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Discussion Starter #9
You've been very helpful and I thank you for that! I will be racing it maybe 2-3 times per summer. I drive only on weekends and I live in NY on Long Island. I'll put maybe 1,000-2,000 miles a year on it.
 

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I would say.....with the Castrol SRF....change it once a year and call it good. But know I'm not a mechanic or a pro driver. Just some things I've experienced the last several years of doing HPDE days and other driving schools.
 

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I'd say take your car to the track and run it and quit worrying about the brakes, the car has bad ass brakes, the fluid in my car has been fine and the pads as well. Make some mods after the track day to see a difference for the next run.
 

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I changed the pads have not done the fluid, mine still stops without problems. The track I frequent may not be so demanding on the brakes due to cool down periods on the straights.
 

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There are several threads about this but I'd change your brake fluid to either Motul or Castrol. Your stock pads should do fine your first few times out.

Consider checking your power steering fluid level. If it's near the full mark it may spew out the top some, making a bit of a mess. You should be able to take a little out or put something like a sock over the cap to absorb what may come out.

If your brake pads seem to fade (long but not spongy pedal) after some high speed stops let them cool down for a couple of laps and then go back at it. They need to be burnished and then they should return and be good to go.
He is spot on with the PS fluid. After taking some out last year I saw little or no fluid leak on my first outing this year.
 

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Agree, change the fluid to DOT 4 and stock pads work fine. It's important to take the cool down lap every session so as not to damage your rotors. I learned the hard way - had to replace 4 rotors.
 

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Discussion Starter #16
Good to know as well...this has been a great thread and very helpful!
 

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I changed the pads have not done the fluid, mine still stops without problems. The track I frequent may not be so demanding on the brakes due to cool down periods on the straights.
We'll be working on you.....to convert you over to Dot 4. We have our ways;););)!
 

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We'll be working on you.....to convert you over to Dot 4. We have our ways;););)!
I recommend a little game of lead/follow. When you out brake him after a few laps he might reconsider. Then again, at BIR do you guys even use brakes?
 

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Should I just go ahead and upgrade to dot 4 if I plan on spending anytime on the track?? Is dot 4 good for leisure driving??
 

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I recommend a little game of lead/follow. When you out brake him after a few laps he might reconsider. Then again, at BIR do you guys even use brakes?
Ha, so I would say on the Donnybrook configuration, that is true, lots of speed and air between using them much. However! Did the competition course pretty hard in the morning for my last lesson. The brakes did fine, really. We found today that these Spohn connecting rods are about the worst things I have ever added! When the rear brake disapates its heat, the damn Sphon greased bushing was there to conduct heat and puke their grease all over the place. Now they make noise and need more grease added. Then I need to go racing again....you guys see where I am going. Had it on the rack at the dealer this morning. Yep, Chip we could have ran endless quarters a couple of weeks ago, the axle was fine. Both the rear and front bushings look like they have been puking. All else looked fine, they adjusted the exhaust shield away from the pipes, seems something may have pushed it down a bit. Picked some carbon fiber out of the cracks. You would have loved it. There is not much room in that tunnel folks. Careful about adding large diameter driveshafts. All while they loaded the latest in software. Go look at my post on that thread..DONT LET THEM DO IT.
 
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