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Hello, I drove my car to work this morning. It is the first time after about 1 inch of snow. I experienced a high pitched sound whenever I was stopped at a stop sign or stop light. It went away once I hit the gas peddle. Has anyone else experienced the same issue and what could be happening?

Hi everyone, Thanks so much for participating in this forum, it has been very helpful for me as a first time hybrid driver. Loving my CMax so far, but a few weeks ago I hit the brakes really hard while sliding on some ice. As of that moment, everything about my brakes felt dramatically different. It was very weird the rest of the drive since I basically had to relearn my braking technique. The brake pedal itself now gives no resistance back to my foot based on how deep or hard I press it. Before this happened, it felt like that was pressing against air-resistance from the pedal with that normal hiss, it felt like every car I have ever driven. Now, none of that exists and the brake pedal feels like it is on a toy car. It still kind of brakes based on how deep I push the pedal down, but if I want a full stop I have to go to the floor, then the pedal springs back up as you'd expect. I can get 100%s still, I just have to control how gradually I brake. This is the only way to brake, though, if I really have to slam on them, it's pretty weak and of course goes right to the floor and you can feel the friction of the brakes. One of the go-to brake solutions would be to pump the brakes, but that is exactly the mechanism that no longer works. There is no more pumping the brakes, nothing pumps, there's no changing pressure, it just springs back, up and down, floor to top. I took it to a mechanic friend and he looked at everything within his knowledge of the system - he took the wheels off and things looked new, brakes engaging perfectly (from his perspective), he tested the booster, did an electrical test. It took him about four hours. It is tough because he had never driven it before, so it was tough for him to process how different it really is, which is very different. If he checked all that, to me that means it must be high up near the pedal itself? Has this happened to anyone else? Does anyone have an idea as to the solution?

Well last night I almost hit a deer going about 30mph. It ran in front of me and my wife, we had our seat belts on thank goodness, maybe at most 15 feet in front of us and I instinctively slammed on the brakes. We stopped instantly, things in back of the car came flying to the front of the car. I didn't think MADMAX could stop that fast. I thought for sure we were going to hit the Deer, it wasn't more than a foot away by then. I had two 1"x6"x7' boards sitting on arm rest that came flying forward and hit my arm and hand, minor wounds, no damage to the car. LOL I keep change, tire gauge, flash light, misc. tubes of neosporin, after bite and lotion in the tray on the floor well between seat and door which were launched into my foot well. MADMAX,Wife and Deer were uninjured. :yahoo: Two years ago I did hit a Deer which cost $8K to fix MADMAX. It almost happened again. :drop: Thank goodness for Great Brakes. :) Paul

This today from OASIS: Mar 10 2014 4703 -2013-2014 C-MAX Hybrid/Energi vehicles - Pull During Braking 2013-2014 C-MAX Hybrid/Energi vehicles may exhibit a slight drift to the left during low speed regenerative braking. Inspect and inflate tires to correct cold pressure as listed on placard. Inspect the tires for abnormal wear or damage per Workshop Manual, Section 204-00. If condition still exists, it may be further minimized by reducing camber on the left front wheel and increasing camber on the right front wheel. Do not exceed the maximum left to right camber split of - 0.3 degrees or published camber specification limits. Refer to the Workshop Manual, Section 204-00 for camber adjustment procedures and published Service Labor Time Standards.

SSM 44169 - 2013 CMAX / 2013-2014 Fusion/Lincoln MKZ Hybrid/Energi - Pull During BrakingSome 2013 CMAX, 2013-2014 Lincoln MKZ Hybrid and 2013-2014 Fusion Hybrid vehicles may exhibit a pull during normal braking. Test drive vehicle to determine if the condition is present with the transmission in the neutral position. If the condition is not present in neutral, this should be considered a normal vehicle characteristic due to the regenerative braking system function. Do not attempt repairs to change this characteristic. If condition is present during braking in neutral, follow normal diagnostics in workshop manual, section 206-00.

I had an odd and unsettling vehicle response yesterday, and I don't see anything similar in a search, so... Coming down a slight grade to an acute right turn, after a battery-draining straight. I (re-gen) braked a little at the entry, and went around with feet off pedals, but carrying a lot of speed. At about the mid-point, when I had maximized lateral acceleration and was diving toward a late apex, I felt the left front wheel start to lock up. It released very quickly, but I had a definite stab of braking, nothing like the gentle re-gen braking. The only positive out of the experience is that the front tire didn't slide at all. No steering correction needed, no change to the arc. Felt like an extraordinarily brief gust of headwind, but it was a calm day and I was in a bit of a hollow. My butt told me it was the LF wheel, but cornering this hard, most of the car's weight is on the LF so it's possible other wheels were involved, but were not loaded enough to impart noticable force to the driver. This is a commuting route, so I'll try again, but I was curious if anyone else has seen anything like it. Remember, I had just taken my foot off the brake pedal, headed for the gas pedal, so I'm sure I didn't apply the brakes by accident. HAve fun, Frank, who is finding the greatest challenge is to exit a spirited turn in EV...

TSB 13-5-21 OVERLY SENSITIVE BRAKES OR PERCEIVED DELAYED TRANSMISSION REVERSE ENGAGEMENT FORD:2013 C-MAX, Fusion LINCOLN:2013 MKZ ISSUE: Some 2013 C-MAX Hybrid/Energi vehicles built on or before 10/2/2012, and Fusion Hybrid/Energi and MKZ Hybrid vehicles built on or before 11/01/2012, may exhibit an overly sensitive brake pedal feel often described as grabby brakes, or a perceived 2-3 second delayed transmission engagement in reverse due to the hill start assist feature activating briefly after starting the vehicle. ACTION: Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE Reprogram the Anti-Lock Brake System (ABS) module to the latest calibration using Integrated Diagnostic System (IDS) release 84.02 and higher. Calibration files may also be obtained at www.motorcraft.com. At the Program Module screen in the IDS service tool, select Program PCM. By selecting the PCM the update will be applied to the appropriate modules as required by the software update. WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage IMPORTANT: Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool. OPERATION DESCRIPTION TIME 130521A 2013 C-MAX, Fusion And MKZ: Reprogram The Appropriate Modules As Required By The Software Updates Includes Time To Clear Codes After Repair (Do Not Use With Any Other Labor Operations) 0.5 Hr. DEALER CODING BASIC PART NO. CONDITION CODE 2C219 04 NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition described affects your car or truck. Contact a Ford or Lincoln dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supercede this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources. Copyright © 2013 Ford Motor Company

Wife picked up new C-Max on 3 Nov. On 6 Nov went to start and totally dead. Called Ford Service who sent someone to jump start it. I did not wish to touch it as so new and it being a Hybrid. On 14 Nov while wife was driving the brake warning lights lite up. She pulled off road and shut down car and called home. When restarted all seemed ok, no warning lights or such so told her probably a hiccup and keep an eye on it. I drove and could not recreate. Next day did again and she called and explained problem. I called the Ford Dealer in Knoxville, TN who said to bring in the next day, the15th. I checked car the next morning and got same brake warnings on both displays, left and right side. Driving to dealer brake warnings again and car stayed in gas mode, no EV. Dealer put on computer and said would have to keep for up to a week depending upon if parts needed to be ordered. Wife unhappy. First car that broke in 20 yrs. Traded reliable Honda Accord. Dealer did furnish a loaner but she is concerned about reliability.

'regenerative braking', huh?......So what happens if you go backwards down a slope and apply the brakes? :headscratch: