08-03-2017, 09:52 AM | #1 |
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Launch Control Issue
Finally tried launch control but it didn’t really work. The issue is while pressing the brake with my left foot and stomping on the gas with my right, the car would move. The checkered flag would pop on for a second then go away. I tried again with more force on the brakes but had the same results.
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08-03-2017, 09:13 PM | #3 |
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08-04-2017, 10:44 AM | #4 |
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08-06-2017, 10:10 PM | #5 | |
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Btw, I decided to try LC by putting the parking brake on. It engaged and the car didn't move. I'll take a closer look at the brakes soon. More than likely I'll have them bled. |
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08-07-2017, 08:40 AM | #6 |
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How long do you expect the vehicle to hold the LC? The torque converter is set up to hold for a few seconds max, once it overheats the LC disengages. I hope you're not expecting it to last through a whole stop light. I'd say you have about 5 seconds (if that) to launch once it's engaged. You really have to time your launches with this setup.
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08-07-2017, 11:18 PM | #7 | |
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Hopefully the issue with the brakes is not major. |
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08-10-2017, 12:36 PM | #8 |
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Ok so it looks like the issue is with the brakes. The pads are low and the rotors are at the min. I’m a bit ticked off because I had the car sent to a BMW dealership where I paid for a PPI. It was noted that the brakes were fine. Even if I did use the brake heavily the past few weeks they should’ve measured that they were low and would need replacing soon.
Anyway not much of a big deal, I’ll replace the brakes and hopefully that’ll address the LC issue. Not that I plan on doing LC all the time…I just want to make sure the car is functioning properly. |
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08-14-2017, 11:55 AM | #9 |
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Were you able to engage the Lunch control on your X5M. I am surprised that your CBS system didn't warn you about the wear out of the breaks. Was there anything in the Idrive CBS about your break pads.
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08-14-2017, 01:01 PM | #10 | |
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I was able to engage launch control if the parking brake was used. There wasn't anything in the idrive about the brake pads. The used car dealer probably reset the CBS even though the brakes wasn't serviced. This is why I had the car brought to a BMW dealer so a trained technician can inspect the car. But apparently they didn't check which is sad |
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08-14-2017, 01:13 PM | #11 | |
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How many weeks you owned the car and the miles you have put on it. The problems faced by you( Launch due to break) is very less than other owners who are complaining about turbo, VANOS, valve stem, oil leaks and electronic. Do you take special care of your car. I have bought a 2010 x5m with 64 k miles on it and hoping it can last until 100 k . Also taken exclusionary warranty for next 40k/48 months for 8k$. What is your thoughts on warranty, are you planning to take one
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08-15-2017, 09:08 AM | #12 | |
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I understand the risks of not having any warranty. My way of mitigating is having a fair amount of tools, knowledge and resources so I can diagnose and make repairs myself. I’m not fortunate enough to have the car serviced regularly at a dealer. |
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08-19-2017, 09:25 PM | #13 |
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Looks like your opportunity has arrived for you to upgrade your E70 X5 ///M OEM brake Rotors+pads with the Superior set of the F15 X5 ///M OEM brake Rotors + pads
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08-22-2017, 01:21 PM | #14 |
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Yup, the F85 rotors just came in. I plan on tackling the job this weekend along with an oil change.
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10-29-2017, 10:50 AM | #15 |
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Ok so I replaced worn rotors and pads, flushed the brake system, and replaced an oil leaking vacuum pump...launch control still didn't work.
I inspected the brake booster check valve and that was fine. I then went ahead to replacing the brake booster and master cylinder. It turns out that the brake booster was on the path of complete failure. My guess is that the diaphragm inside the booster would start leaking after the brake pedal is pressed past a certain point. This might be the reason why the issue wasn't noticeable on normal driving. And probably why the BMW tech inspecting the car didn't pick up on the issue. I'm happy to finally do LC and know how the braking of the car should feel like. |
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01-10-2018, 01:56 PM | #16 |
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same here.. cant use launch control whatever im trying on MDM, ESP system off or normal on D,S or manual mode.. car wants creep hardly while braking and in mechanical way it can be felt that it harms the shaft etc.. i didnt try with parking brake but i feel like it wont work anyway.. im abroad at the moment that cant try w/parking brake but i will..
rotors are low a bit but pads are new.. no faults or leakage.. but cant find the reason.. my car produced at April '10.. any ideas why? |
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01-10-2018, 04:08 PM | #17 | |
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There are many components in the braking system. I would start with flushing the brake fluid. Here are some symptoms if you have a brake booster issue: -Hissing sound or air escaping when the brake pedal is pressed -with max force on brake pedal, the pedal will go down but then a greater force from the system will push the pedal up. -in safe steep decline area, repeatedly press and let go of the brake pedal quickly. or with a constant pressure have you foot on the brakes but increase and decrease pressure. A failing brake booster will not stop sharply. If you have a brake booster problem, I suggest starting with the easiest and cheapest replaceable items. Remove the brake booster check-valve and test it. At the same time you can use a vacuum gauge and test the amount of vacuum the vacuum pump is producing. If those are fine then you may want to start looking into the master cylinder and booster. Note that the master cylinder has to be removed if the brake booster is replaced. |
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01-11-2018, 05:18 AM | #18 | |
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01-11-2018, 09:28 AM | #19 | |
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I tried reaching out to local X5M to see how it is done and to feel how the braking system should be like. Fortunately there was an X5M for sale locally that I was able to test drive to feel the baking system. Send me a PM and maybe I can help you troubleshoot. We could facetime or I can end you a video of how it's done. You're not along...this is what forums are for. Keep in mind nothing about launch control feels natural for the car. The torque converter is designed for this. |
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01-11-2018, 09:39 AM | #20 |
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Launch control is designed purely for allowing the motor to build rpm (boost) before moving.
If you watch the vid in my sig, this is how long you should be holding brake/building rpm before disengaging -- any longer and you're going to start wearing out/over heating components. I did this hard launch to WOT about a dozen times that weekend without issue. |
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01-11-2018, 05:18 PM | #21 | |
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