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post #1 of 3 (permalink) Old 28th April 2012 Thread Starter
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2003 Megane Dci - Brakes problem

I have just noticed a quite scary braking problem on my Megane.

I have had it for around 6 months and noticed a slight braking deficiency sometimes before.
It hadn't really been a big deal as I wasn't 100% sure that what I felt was actually happening as it was so rare and I couldn't make it happen again.

But yesterday I worked out how to make it happen...

As I drive economically, I really don't have to brake hard very often. When I do, the brakes have a problem.

When braking at slow speeds (when approaching a roundabout for instance), the pedal is pressed slowly and gradually. The pedal depresses slowly and brings the car to a stop nicely.

However, when doing an emergency stop or braking aggressively, the pedal seemed to stop, which stops me engaging the brakes fully.
It's hard to explain but it's as if the first part of the pedal press goes fine and the pedal depresses normally, until around half way down and then the pressure stops the pedal going all the way down, therefore stopping the brakes engaging fully.

I tested this while driving at low speed.
While driving, instead of pushing the pedal normally, I pumped the brake pedal a few times.
Sure enough, the pressure built up so the pedal was stiff and at the top of its axis, and sure enough, I was still going. I couldn't depress the pedal enough to stop the car.
When I pressed the pedal hard, it gradually lost the pressure and when the pedal reached the lower part of the axis, it started stopping the car.

I did this a few times while testing. Then when I got out I could smell the brakes burning.
This was a surprise because I would have thought, due to my testing showing the pressure of the pedal causing "less braking", surely the brakes should be getting less stress on them.

Any idea what's going on as I need to get this sorted asap.

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2005 Megane Coupe Cabrio 2litre 16v, 2004 Shogun Sport Equippe, 2004 Clio Dynamique 1.2litre 16v, 2004 Ford StreetKa Winter, 2004 MR2 Roadster 1.8vvti, Honda Shadow 600cc.
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post #2 of 3 (permalink) Old 28th April 2012
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Re: 2003 Megane Dci - Brakes problem

I ain't sure if your system has brake assist which may be not operating correctly. Brake assist works on the speed of which the pedal is depressed - it kicks into play when the brake is applied quickly. It may be worth checking the brake pedal switch hasn't moved out of position.

One other possibility is that you have an air leak in the brake servo system.

Deos the car stop effectively in either operation?
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post #3 of 3 (permalink) Old 28th April 2012
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Re: 2003 Megane Dci - Brakes problem

i have had this problem on my kangoo van for a while i have checked every thing i can think of only thing left are the pads upto the job i fitted new discs/pads just 3 mths ago and have a feeling its that as for the first 2 miles from cold the brakes are great after that it takes more pressure to stop
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