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How can I fix my Renault Megane Brake problem?

I have a 2002 Megane Convertible, which has a brake problem.
The pedal is ok during normal use, the servo is assisting, but if I need to brake heavily, the pedal does not allow me to excert extra pressure on the brakes. The pedal seems to jam, and not continue travel as one might expect.
I have checked the servo by pumping the pedal until it goes hard, with the ignition off, and the pedal does then drop once the car is started, but at about 1/4 travel, the pedal seems to jam as of there is a brick underneath it. I have checked inside the cabin to see if anything was obstructing the pedal, but I could not see anything.
The car does have ABS, and I wondered if it might be something to do with that. The wheels do not lock up under heavy braking, but I think this is because whatever is stopping the pedal, actually stops the brakes applying hard enough to even begin to lock the wheels, and the need the ABS to activate
Can anyone help?

Ashley
February 2011

Renault Megane Vehicles, Cars Renault Megane Brake Problem

I realise the wheels shouldnt lock up with abs, but it is a case where the pedal wont even allow you to push hard enough to require the abs to operate. The pedal locks up before anything other than gentle braking is required. It is fine in general use, but should I need to perform an emergency stop, I am sure it will not stop the car suddenly. Braking performance is limited to whatever pressure can be excerted within the first inch or so of pedal movement.
I only mentioned abs, as I didnt know if the system may cause a fault felt at the pedal, where normal pedal travel is being restricted.
It literally feels as if something is jamming the pedal near to the top of its travel, rather than allowing complete and normal pedal deflection.

Ashley
February 2011

if you have abs the wheels aren`t supposed to lock up

cdc
February 2011