Hello, I am writing about a brakes problem on my Megane 2011 model. It all started in December when i realized the brakes pedal is a bit soft and it doesnt stop as it should be. After a visit to a local garage they said my rear back wheel was blocked and the pads were a bit rusty so they tood them out and cleaned them. I was told there is air in the front left wheel and they bled the system oldfashion way. After a week it was the same so it was bled again, and the same no brakes after 2-4 days. I went to a Renault dealer and i explained what is wrong so they bled the system and it only lasted 3-5 days again. The symptoms are. pedal getting soft when u press the brake pedal and if u try to stop in emergency only front right wheel locks the left one looks like doesn't stop. I went back to Renault and they said its the master cylinder. They replaced the cylinder with a brand new one and bled the system. Again after a week the same story again. Also I noticed when i press the brakes pedal a noise like air coming out sound like from the servo and when u pump the pedal few times the pedal not only gets harder but the servo makes strange noises for a while and then stops. I went again to Renault garage and the said the will pressure bleed this time, so they did and the car was perfect for 7 days. on the 7th day i was driving and i had t stop hard in an emergency and the abs on the car was working in order to stop and immediately after that i felt like there is something wrong with the brakes again. 4 days later i have again air in the same left from wheel and no proper brakes. They told me in Renault its probably the servo but probably yes may be not it costed me a fortune so far and even more to replace servo if I decide to. Please anybody with similar problem or a clue what is doing all this, is it realy servo, is it some air still left to give me an advice.
vladograka
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I have the same problem,changed calipers,master cylinder,great brakes for a week and then pedal hits the floor.
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I had same problem,it was servo. Brakes are great
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Check your brake calipers,spent 350 pounds and all it was front brake calipers which cost£25 from scrap yard.
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Do you have to program the abs module from the breakers yard
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How did you remove abs module.?
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Friend had same problem and found £1000 later it was all along the abs module,and now brakes are 100%.
I have the same problem, 2011 Megane Bizu, had new breakpads and discs in Jan. 2017, in a garage in Bristol. Brakes failed in March, had a near accident in the middle of Cardiff. Garage in Cardiff bled the calipers and it passed the MOT. A week later problems again, took it back to the garage in Cardiff (live in Bristol, work in Cardiff), they said it must be the main brake cylinder and fitted a new one. Still not right, you have to push the brake right down to the bottom before it brakes! My girlfriend is expecting a baby and is driving the car as well. Going back to the Cardiff garage tomorrow, wondering what to do now, - apart from this it's a good car, but this problem must be sorted out! Wonder if Renault will be responsive to this! Any other up-to-date comments or experiences, I'd be grateful to hear them.
I have also spent over £1000 since January, the car even passed its MOT in March, still not right!
I have the same problem on my 2011 megane dci, I have had the abs module replaced as the brake pedal would lose pressure. This came back again after 2 weeks, brake pedal would slowly lose pressure until it would only brake at the bottom of travel, quite scary! So we had the master cylinder replaced, once again the brake pedal was hard for about 2 weeks now it is completely dropped again. We have found no leaks and no fluid drop so at a complete loss now. Has anyone found the cause?
Hi all.
This is my first post, so please forgive me if I post my reply incorrectly.
I can definitively say that I KNOW the answer to all of these brake problems that us Renault drivers are enduring (and I am quite sure that Renault know this).
The vehicle I have worked on is my Daughter’s 2011 Megane MK3 Grandtour 1.5dCi 110 but lots of Renaults have the same system.
After reading many articles (especially on this website) replacing pads, discs, master cylinder, calipers, it transpired that the previous (company) owners of my Daughter’s Megane had replaced the front pads without cracking the bleed nipples when rewinding the caliper pistons.
This action forced fluid backwards through the ABS pump and (from what I can gather) ‘flipped’ some of the seals inside the ABS block. The microbore drillings inside the ABS pump (now unsealed) allowed fluid to gradually seep back into the master cylinder reservoir. Thus, there is a very long pedal when you use it but no signs of fluid leak. Re-bleeding the system temporarily replaces fluid in the ABS pump drillings but over time, this ‘replaced’ fluid simply drains back to the reservoir via capillary action. During this time when using the vehicle, there was never any indication of an ABS fault on the dash and when scanned with ‘CAN Clip’, no fault was ever found.
So the answer you are looking for is….simply replace the whole ABS pump and module. Not solely the module but the whole pump unit.
Make sure that the part numbers match so that the replacement pump does not require electronically coding to your particular vehicle.
Bleeding of the replacement pump can be quite long winded due to the very small capillaries inside the pump body and I found the pressurised bleeding system to be the most effective at removing trapped air (using new brake fluid, of course).
Access to the ABS pump (locate under the bonnet, up against the bulkhead on the driver side, hidden behind a sound deadening blanket) can be very limited but in my instance on a Megane MK3, I found the task easily accomplished by a competent mechanic. Removal of the plastic air charge pipe from the turbo, the metal air pipe on the top of the engine and the exhaust gas recirculation valve were necessary for the ABS pump to be safely extracted and the replacement to be refitted. Slight manipulation of the aluminium brake pipes and undoing of the air conditioning pipe clamps were also required. This should be done with the upmost care as these can easily kink and become unusable, making your task far more complicated.
A new pump from Renault was quoted at £1485.00! A second-hand unit was obtained for £135 from a specialist Renault breaker. The result is perfect brakes for the last 2 months and passing a resent MOT.
I have only posted this reply after waiting a length of time to make sure that my repair is the correct answer. Confidence in driving this vehicle has now been restored [FONT="]***128521;[/FONT]
[FONT="]
[/FONT]
I really hope that the explanation of my experience will give other Renault Forum users the confidence in repairing their ailing vehicles.
All the best.
Paul
This is my first post, so please forgive me if I post my reply incorrectly.
I can definitively say that I KNOW the answer to all of these brake problems that us Renault drivers are enduring (and I am quite sure that Renault know this).
The vehicle I have worked on is my Daughter’s 2011 Megane MK3 Grandtour 1.5dCi 110 but lots of Renaults have the same system.
After reading many articles (especially on this website) replacing pads, discs, master cylinder, calipers, it transpired that the previous (company) owners of my Daughter’s Megane had replaced the front pads without cracking the bleed nipples when rewinding the caliper pistons.
This action forced fluid backwards through the ABS pump and (from what I can gather) ‘flipped’ some of the seals inside the ABS block. The microbore drillings inside the ABS pump (now unsealed) allowed fluid to gradually seep back into the master cylinder reservoir. Thus, there is a very long pedal when you use it but no signs of fluid leak. Re-bleeding the system temporarily replaces fluid in the ABS pump drillings but over time, this ‘replaced’ fluid simply drains back to the reservoir via capillary action. During this time when using the vehicle, there was never any indication of an ABS fault on the dash and when scanned with ‘CAN Clip’, no fault was ever found.
So the answer you are looking for is….simply replace the whole ABS pump and module. Not solely the module but the whole pump unit.
Make sure that the part numbers match so that the replacement pump does not require electronically coding to your particular vehicle.
Bleeding of the replacement pump can be quite long winded due to the very small capillaries inside the pump body and I found the pressurised bleeding system to be the most effective at removing trapped air (using new brake fluid, of course).
Access to the ABS pump (locate under the bonnet, up against the bulkhead on the driver side, hidden behind a sound deadening blanket) can be very limited but in my instance on a Megane MK3, I found the task easily accomplished by a competent mechanic. Removal of the plastic air charge pipe from the turbo, the metal air pipe on the top of the engine and the exhaust gas recirculation valve were necessary for the ABS pump to be safely extracted and the replacement to be refitted. Slight manipulation of the aluminium brake pipes and undoing of the air conditioning pipe clamps were also required. This should be done with the upmost care as these can easily kink and become unusable, making your task far more complicated.
A new pump from Renault was quoted at £1485.00! A second-hand unit was obtained for £135 from a specialist Renault breaker. The result is perfect brakes for the last 2 months and passing a resent MOT.
I have only posted this reply after waiting a length of time to make sure that my repair is the correct answer. Confidence in driving this vehicle has now been restored [FONT="]***128521;[/FONT]
[FONT="]
[/FONT]
I really hope that the explanation of my experience will give other Renault Forum users the confidence in repairing their ailing vehicles.
All the best.
Paul
Attachments
Hi I read this forum last year but did not post, trying to work out whether my 2011 1.5dci III Megane estate was suffering the same problem of air ingress to the braking fluid, lengthening pedal travel and worsening braking performance. It started out of the blue last October, the mechanic simply bled the brakes back to normal but seemed uninterested in the possibility that the problem would simply return. Which it did... I took it to the local garage (different to the 1st place) where I was told unequivocally that it was the master cylinder. £275 and a week later... guess what. Soft, longer pedal travel and ever decreasing braking performance after about a week and average (if steady, driving), mileage. Since then I have been bleeding the brakes myself regularly to keep it roadworthy while I worked out what to do but with decreasing confidence in the car and the ability of anyone to correctly diagnose and repair this persistent slow airleak into the brakes. (NSF corner always seemed to cough out the most air during bleeding).
At no point has any warning light shown and no fault codes back from diagnostics.
It managed to pass the MoT but they reckoned at that point it was the ABS causing intermittent problems. Solution: remove ABS pump / unit and send away for reconditioning. OK, I said. After a delay by my local garage, the answer has come back from the pump reconditioning people, this ABS pump is absolutely F****d and beyond repair. Replacement ~£900.
I saw the post above from Paul2 and thought this might be it but there had been no such work carried out on my car prior to it starting to go wrong. How does this situation explain the ingress of air? I also noticed the fuel economy worsen - from ~58mpg down to ~52. Could this be in any way related?
So many questions but the main one is :- What software issues would we face if I and a skilled acquaintance were to try to replace it with a recon part from online? Given that a replacement door lock mechanism would not work down to some S/W compatibility update issue bullsh*t, would the car's electronics not freak out at some new part?
Thanks for reading!
At no point has any warning light shown and no fault codes back from diagnostics.
It managed to pass the MoT but they reckoned at that point it was the ABS causing intermittent problems. Solution: remove ABS pump / unit and send away for reconditioning. OK, I said. After a delay by my local garage, the answer has come back from the pump reconditioning people, this ABS pump is absolutely F****d and beyond repair. Replacement ~£900.
I saw the post above from Paul2 and thought this might be it but there had been no such work carried out on my car prior to it starting to go wrong. How does this situation explain the ingress of air? I also noticed the fuel economy worsen - from ~58mpg down to ~52. Could this be in any way related?
So many questions but the main one is :- What software issues would we face if I and a skilled acquaintance were to try to replace it with a recon part from online? Given that a replacement door lock mechanism would not work down to some S/W compatibility update issue bullsh*t, would the car's electronics not freak out at some new part?
Thanks for reading!
I tried posting a fuller answer but the forum seems to have crashed and lost it, so here goes, a bit more briefly. My 2011 diesel Megane started showing brake problems (soft, long travel on pedal, deteriorating braking performance) out of the blue (no recent work done or any possible obvious reason) which caused air in the system, so bleeding removed the problem for a week or so before the problem returned.
Local garage replaced master cylinder (£275, with no improvement). For a while I bled the brakes myself to keep it roadworthy every week or 2. Now the ABS unit has come off and gone away to a specialist to recondition it. They got back yesterday and said it's absolutely FUBAR and beyond any repair. New one will be ~£900.
A friend of a friend suggested going down the same route as above, a used / recon unit for £100-200.
Question is, what software issues are likely to emerge? Last year I had a saga replacing a simple door lock actuator which turned out after a lot of messing about by the same garage, to be a software update requirement.
Another question is, has anyone looked into why there's been no recall? It strikes me that there's been a lot of Renaults built ~2011 with very expensive failure of a major safety critical component. Was there a duff batch of units built on a Friday afternoon?
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Nope it didn't, you are just a newbie so Mods need to approve your posts. The most you post this will stop having to happen, so please be a little patient and we will get you sorted out ASAP :smile2:
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Do you need to unmount the engine? Or you can change the unit without touching anything else?
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Hi all I have the same problem with my brakes...(2009 Megane III). I went to the local garage and they changed my mastercylinder after a few days the brake pedal gets soft again. They bled the system.. a few days later again and they repeat this whole process for a several time. After this I went to an ABS specialist and they cleand and repaired the ABS module. After a few day the pedal gets soft again... The brake servo works fine.. Anybody got any suggestion waht is the problem?
Thank!
Thank!
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HI vladograka, we know you originally. posted this in 2011 but we are in Australia and have had the same brake fade problem with our Renault Megane that we have owned since new in 2012. Renault Australia has tried to fix the problem by bleeding the brakes and then replacing the master cylinder, yet the problem keeps on reoccurring. It has now been over six months since the local Renault service centre has tried to fix the problem and keep charging us for each repair that doesn’t rectify the problem. From all the correspondence we have read through various Renault forums there appears to us to be a fault with the early model Megane Renault braking system that Renault won’t acknowledge. We have since raised this problem with Renault Australia and our local Renault service manager who wrote to us stating ‘The forum comments mean nothing to us and we don't take any notice of them.’ We find this disappointing that a worldwide brand such as Renault takes no notice whatsoever about problems with their vehicles from any forums where like-minded people come together. We would sincerely appreciate you providing us with any information that you may have regarding how the brake fade problem was fixed or any acknowledgment from Renault that there is in fact a fault with their brake system on this model. Thank you for your time and consideration of our request. Mark & Kristina.
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