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7
X1 brake failure
Morning Nellie and Paul As far as I was aware and have read the issue is with the ABS unit or to be accurate 2 ABS units (ATE MK100 and ATE MK 25A) that were fitted to quite a few models (not just BMW) between 2011 and 2020 and shows more often on cars with DSC. The big problem is the rate of failures compared to the number of cars with the unit fitted is small so BMW avoid recall on safety grounds, plus it seems (as far as I know) to only seems to happen outside warranty ie. over 3 years old leaving repair cost with the Owner. BMW will also argue that a car serviced by their Dealerships would pick up the fault at Brake Service and advise repair. Always expensive as BMW will replace units not repair them. BMW will also wash their hands if a repair or service is carried out by a Non Franchised Garage (But they are not alone here just about all Main Dealers and Manufacturers are the same) That doesn't mean all is lost there are a few Repair Specialists in the UK who repair (and improve) these units one I have used is ECU Testing who are very good. Now the calliper sticking? is the the ABS pump not releasing all pressure after braking or a fault with the calliper its self? it needs checking with a BMW capable Diagnostic system which would identify if it was a calliper failing/sticking or ABS issue. Also it is good engineering practice if a calliper sticks to either service both callipers or replace both If replacing Fluid only use BMW Spec fluid. It is sad to read tales of woe like this as generally the X1 is a good car and there is nothing wrong with Independent Garages other than some do not have the specialist knowledge or equipment If you are not able to DIY then I would find a BMW Specialist close by I am not a BMW garage just an enthusiastic car owner who loves to service and maintain my own cars plus some friends and families. Over the years I have amassed a strong collection of tools and knowledge including Diagnostics which allows me to work at Dealer level on several makes (Volvo, Mercedes, Audi, and BMW) Dave -
7
X1 brake failure
Hi Paul BMW insisted that as the brake fluid was touched by the independent garage who did the 45,000 service, then it was not a BMW problem. BMW eventually changed the brake fluid and retested, and NFF. Daughter had to suck up those costs plus the repairs to get her car back. Update: probably unrelated, but worth noting. coming back from the Lake District in the rain (June 2025), the O/S rear brake seized. Car was recovered back to Reading. Independent garage replaced calliper and pads, then ABS system, as they discovered a known fault with these brakes in that the ABS senses when the wipers are working and applies slight brake pressure to clear any potential water from the brakes . . . . -
7
X1 brake failure
Hi Nellie, My name is Paul and this exact thing just happened to my daughter in her 2018 X1. Would love to learn more about what you found out. Thanks, Paul -
3
Engine misfire
Hi Andrew Do you have any Diagnostic software ? or know someone who does ? By selecting live data I can see my injectors and whether they are operating at the same (or close volumes) I can also so see fuel rail pressure. So I don't have to get my fingers dirty unless there's and issue. My brother In-law's 540d estate is at a little over 200k and running well so mileage shouldn't be an issue I would start by checking for any leaks on the Inlet side. Unmetered air will cause a misfire Dave -
3
Engine misfire
Hi Dave, I don't like the sound of that. Firstly I don't know the first thing about checking fuel rail pressure, and the injectors have never been checked while I have had it. I got it at 89000 miles and its now at around 144,000. I can get the car to go as quick as I want without a miss as long as I don't want any severe acceleration. I would also be nervous about removing injectors as I have heard many horror stories about them breaking. The vacuum lines were renewed last year. It would appear the fuel sensor would be the only thing would want to try myself before i have to surrender it to a Bmw expert. thanks Paneuro.
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