Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: [Brake performance] Standard brakes on Roadster 2.5

  1. #1
    Model S R231 EU widodh's Avatar
    Join Date
    Jan 2011
    Location
    Middelburg, The Netherlands
    Posts
    3,539

    Icon5 [Brake performance] Standard brakes on Roadster 2.5

    Hi,

    My colleague is on vacation for a couple of weeks, so the Roadster is at my house for that time.

    I drove again a bit today and I noticed right away, the brakes are SO weak on a Roadster.

    I found this thread: Braking issues ...

    Anybody else finding the brake performance of the Roadster really low?

    A car like the Roadster with it's huge acceleration potential should also have a descent deceleration, but it doesn't imho.

    If I compare the braking power to my BMW M5 or Toyota Auris Hybrid the Roadster ends last.

    Did anybody here replace the brake pads or the pistons? If so, with which ones?

  2. #2
    Senior Member strider's Avatar
    Join Date
    Oct 2010
    Location
    Bay Area, CA
    Posts
    2,470
    I wonder if your colleague didn't properly bed in the brakes? I have found that the stock brakes work fine. The Roadster doesn't stop as fast as my Corvette but I believe this is because the tires are quite small relative to the weight and not related to the brakes at all. My Corvette had much larger tires and only weighed slightly more.

    From: Hawk Performance Brake Pads: Frequently Asked Questions

    What is the proper procedure for braking in new brake pads?
    Brake pad break-in procedure.

    After reaching medium speed engage brake pedal to slow car without coming to a complete stop. Release pedal quickly and do not drag brakes. Repeat four or five times.
    At higher speeds engage brake pedal to slow car without coming to a complete stop. Release pedal quickly and do not drag brakes. Repeat five times.
    At or near race speed engage brake pedal to slow car without coming to a complete stop. Release pedal quickly and do not drag brakes. Repeat three times. Allow a few seconds between brake engagements while car is in motion.
    Do not hold brake pedal. Park car for approximately 20 minutes or until brake rotors are completely cool to the touch.
    If during the above steps the brake pedal becomes soft or brake fade is noticed, park the car immediately for approximately 20 minutes. Do not hold brake pedal.
    Important reminders:

    Do not attempt to use badly worn or damaged rotors with new brake pads.
    Do not drag brakes while car is moving during break-in procedure.
    Do not engage pedal while car is stopped at any time following the break-in procedure.
    Upon completing the procedure, allow the brake system to completely cool before racing.
    Applying the pedal a few times before the start of the race will allow the brake pads to heat up before attempting to reach race speeds.
    Clean a used rotor surface with fine sand paper or steel wool, rinse with water, dry and install before bedding new pads.
    Some forms of racing don't allow time for the proper break-in procedure to be performed. However, it is still very important to attempt to perform at least the core of the procedure: slow heat build up and complete cool down.
    Twilight Blue Roadster 2.5 - #1098 / Grey Model S Performance - #1459

  3. #3
    Roadster 919, S 2006 Doug_G's Avatar
    Join Date
    Apr 2010
    Location
    Ottawa, Canada
    Posts
    12,257
    Blog Entries
    1
    I find the Roadster's brake pedal takes a bit more force than most cars, which can give you the impression that they are weak. But they actually do stop quite fast... in fact, here's an anecdote to illustrate:

    After getting the Roadster I decided it would be a good idea to take the CASC Race School, and learn how to drive a performance car properly. The first in-car task was an emergency stopping exercise. You drove through a slalom and then into a large puddle, where the head instructor was standing in the middle. You had to aim right for her. At the last moment she'd wave a flag and you had to avoid her in the direction she waved (proper procedure is to slam brakes first to load up the front tires, then steer).

    I had a lot of trouble with this, but not (like half the class) because I balked at trying to run down a middle-aged woman (I figured she knew what she was doing). No, my problem was the Roadster kept stopping way short.

    On the second attempt my in-car instructor asked me to go faster. We stopped short again. The head instructor looked at us and said, "This is going to be interesting. Faster!"

    Finally after several increments in speed, with my in-car instructor reading off the speedometer so I could keep my eyes on the road, we were bearing down on her with what seemed break-neck speed. As in her neck. At the last second she waved the flag, I planted the brakes then turned the wheel, and we slid and ABS-ed our way to our resting point right beside her. Success!

  4. #4
    R1211 & S282 NigelM's Avatar
    Join Date
    Apr 2011
    Location
    Sarasota, FL
    Posts
    10,435
    Blog Entries
    2
    So what was your final speed??

  5. #5
    Roadster 919, S 2006 Doug_G's Avatar
    Join Date
    Apr 2010
    Location
    Ottawa, Canada
    Posts
    12,257
    Blog Entries
    1
    Quote Originally Posted by NigelM View Post
    So what was your final speed??
    That exact number is a bit fuzzy because it's been almost two years, but it was over 50 kph and we were pretty damned close - a matter of meters - when she waved that flag.

    They do take safety very seriously. CASC regulations set the pit lane speed limit at 60 kph, because that's the threshold above which serious bodily injury is likely. So they weren't going to get me to go that fast. I'm sure she's fast on her feet, if need be, but there's no doubt she's fearless!

  6. #6
    Member Mitrovic's Avatar
    Join Date
    Dec 2010
    Location
    Bern, Switzerland
    Posts
    520
    First I thought also the brakes are weak. Then I went on a race track with an instructors.
    Now I think that we are just not used to those brakes. We are used to super-servo-assisted brakes you merely touch them and the car brakes. At the roadster you have to slam the brakes really hard, but then, oh boy, it really BRAKES!

  7. #7
    Senior Member cinergi's Avatar
    Join Date
    Sep 2010
    Location
    Arlington, MA
    Posts
    2,037
    Blog Entries
    1
    They do require a lot of pedal force but for me I find them a bit weak ... I've had some quick stops ... My STi would have done better. It's probably related to the weight balance and overweight design (for the chassis) of the Roadster. That said its not empirical and 100-0 braking comparisons would be really nice.
    SOLD | Roadster 2.5 #1077 | Very Orange | Forged Wheels | Electronics Package
    Model S #SSL146 / VIN #246 | Signature Red | Black Interior with CF Accents | 21" Silver Wheels | Panoramic Sunroof | Performance
    http://fearlessbit.com/

  8. #8
    Roadster 537, Sig P85 ggr's Avatar
    Join Date
    Mar 2011
    Location
    San Diego CA
    Posts
    1,060
    Blog Entries
    3
    A racing driver friend of mine recently drove the roadster in the local mountains, and pointed out that the brakes are usually cold! They stop just fine after a few uses.

  9. #9
    Sig 100 - #52 frequencydip's Avatar
    Join Date
    Dec 2011
    Location
    Los Angeles
    Posts
    152
    I also felt the brakes are under powering. I changed the pads to Carbotech AX6 they are much better initial bite but they squeal just a bit.

  10. #10
    Model S R231 EU widodh's Avatar
    Join Date
    Jan 2011
    Location
    Middelburg, The Netherlands
    Posts
    3,539
    Quote Originally Posted by ggr View Post
    A racing driver friend of mine recently drove the roadster in the local mountains, and pointed out that the brakes are usually cold! They stop just fine after a few uses.
    I think you are right.

    I took the Roadster out for a drive yesterday and braked really hard a couple of times. Once the brakes were warmed up and all the dust and rust was off, the brake much better. But you have to slam them REALLY hard.

    It seems like the brake-assistance isn't that hard, you have to do a lot your own. My M5 of course has hydraulic brake-assistance which is much more powerful.

    You have to know you have to press the brakes that hard, otherwise you'll be surprised.

    My idea is also that since you use the regen so much, the brakes start rusting and dusting?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. The Brakes! The brakes? Impact!
    By Mitrovic in forum Roadster
    Replies: 24
    Last Post: 2012-09-02, 06:26 AM
  2. Model S standard vs. performance!
    By Raven5000 in forum Model S: Driving Dynamics
    Replies: 7
    Last Post: 2012-08-20, 10:09 PM
  3. Replies: 11
    Last Post: 2012-05-15, 07:05 PM
  4. Roadster standard mode miles?
    By Palpatine in forum Roadster
    Replies: 18
    Last Post: 2010-08-19, 04:56 PM
  5. Brake dust and performance
    By TeslaForMe in forum Roadster: Technical
    Replies: 2
    Last Post: 2009-03-07, 03:01 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •