Renault megan. Intermittent loss of brakes, then pedal goes hard

SOURCE: 94 4runner brake pressure.

did you possibly replace brake lines with standard instead of metric lines.The standard lines will fit but you will not get pressure back

SOURCE: Renault Megane, 1999.

hey hows it goin im sure ur problem is at the the back its probably a bare wire or the connection is faulty where it geos in to the lamp just take out the lamps and check the wiring and the connections it should be easliy spotted if the car is wired up for trailer lights check that plug as well

SOURCE: rover 45 rear brake pad renewal (caliper problem)

you have to fitt the caliper realy tight to get a good hand brake..remove the caliper..With pads in place. Press the brake to push out the piston.Only a little.Then replace the caliper with it realy tight onto pads.Then work the handbrake up and down a few times then you should be ok.Dont worrie about the brake being a bit tight.Just take it for a short run then.It will losen up.The handbrake is self adjusting.

SOURCE: 1990 Trofeo .. brakes pedal goes hard .. loss of

There are two things to look for regarding this problem. You have the "teves" ABS system, as do I in my 1989 trofeo. They were NOT that good, and tend to be somewhat trouble--prone. I DID have the same problem you do, mine was the ABS pump relay. There are two brake system relays mounted on the firewall of our cars, near the center, above the A/C blower motor. One is for the pump--the other one is for the whole brake system. If the pump relay goes bad(due to it running too much, from a "bad acumulator" which I DID have--and you probably do too..), it will not turn on the brake pump, and if the acumulator is either bad, or discharged...you will NOT get ANY power assist at ALL!! Our cars do NOT use vacuum brake assist--it is ALL done by the hydraulic pressure, stored in the accumulator. The relays are only about 10 each, and not hard to get. Another somewhat possible problem is the brake pressure switch, which triggers the pump relay, and it sometimes goes bad. If so, it causes the same problem as the relay. It is on the brake master cylinder assembly, and has about 4 wires or so on it

Also...you may have a bad accumulator. This is the ball--shaped thing on top of the master cylinder.It stores brake pressure, between pump runs. If it goes bad but the pump still works...you WILL have brakes, but SOMETIMES...the pedal will be hard at first, and then work. They go bad after some years of use, and mine was bad. A new one is available from GM, for about 150.

Once these "sore spots" are taken care of...the Teves system DOES work nice, and stop quick. Just have someone check these things that knows what they are doing. Good luck with your Trofeo--I love mine.

Jack.

SOURCE: Renault clio abs light comes on with vibration

How hard are you stepping on the brake pedal? What you are describing sounds like the ABS system activating. When you step on the pedal hard enough to engage the ABS the light will come on, in some cars it will blink. You will also feel the thumping/vibration in the pedal since the system works by repeatedly engaging and disengaging the brakes. If it is happening when you step lightly on the brakes then you may have a bad wheel speed sensor or possibly a bad or miss-adjusted brake switch.