Grand Scenic Electronic Handbrake Stripdown Plus Photos - Page 3 - Renault Forums :: Independent Renault forum

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post #11 of 45 (permalink) Old 22nd June 2013
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Re: Grand Scenic Electronic Handbrake Stripdown Plus Photos

Hello,

Can anyone tell me how to sort out a jammed motor?

Here is what happened: I had to release the cables from the mechanism and pulled the emergency release handle. It turned out later that the cables are jammed and the inner cables don't move inside the outer ones and that's what's causing the rear brakes to overheat. So I had to start the car for something and with turning the engine off the handbrake motor started with very strange noise and as it later turned out - it jammed. I tried the traditional way of releasing the handbrake (the lever and the button on the dashboard) - again strange noise. I hope this haven't damaged the motor and the mechanism. Then I got the handbrake unit with both brake calipers out and filled the cables with WD40 which helped me unjam the cables and separate them from the calipers. But the cable with the thread end is still jammed in the motor mechanism. Any idea? What I am thinking is to get 12V power to the motor and it will unwind it but I am not sure this will work and don't know the current polarity for unwinding.
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post #12 of 45 (permalink) Old 17th September 2013
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Re: Grand Scenic Electronic Handbrake Stripdown Plus Photos

Hi Guys,
Great write up on this stripdown.
Just one question tho.... my EPB is working just fine but....i activated the EPB without the nipple being attached to the actuator arm of the offside/drivers caliper so i have a feeling its wound in one side a bitty lol

....how do i release some handbrake cable from within the module/motor to allow it to be fitted back onto the actuator arm, i'm roughly about 10/15mm short

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post #13 of 45 (permalink) Old 23rd September 2013
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Re: Grand Scenic Electronic Handbrake Stripdown Plus Photos

Try using a hand-made tool like the one from the first post (the last pictures).
Quote:
Originally Posted by Cardinal Sin View Post
If you do need to replace the pads or adjust the calliper you WILL need a brake winding/unwinding tool.

If you do remove the calliper do NOT let it dangle on the handbrake cable that WILL damage the cable.

If the cables move freely and appear OK then the pads may be causing the problem being worn right down, you may also need a special tool to release some slack cable from the control unit.
I made a tool up for that purpose from an old tyre lever and two lengths of 10mm screwed rod as in the photos. Fit to the cable as shown (with the handbrake off) ( See photos 29 & 30)

Screw up the nuts until the cable is tight. Operate the handbrake. Release the handbrake, there should be some slack on the cable now. Screw the nuts up to take up the slack. Repeat the process until there is enough slack cable so that the actuator arm will be at its fully open position. Adjust the calliper action on the disc so that it works correctly. Refit the cable and arm.
DO NOT operate the handbrake without the special tool ON or the cable fitted to the brake correctly. If you do the cable will get drawn into the unit and keep going until the motor jams. You will need to strip the unit as above to sort it out.
Another option is to open the cover of the EPB and unscrew some cable manually from the inside. Then you'll have to seal it using silicone gasket maker once again.
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post #14 of 45 (permalink) Old 30th October 2013
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Re: Grand Scenic Electronic Handbrake Stripdown Plus Photos

Is there any way at all that i can do anything with the cable other than replace it? My EPB works fine - the arm on the caliper seized in the locked position - i have been under and freed the arm up. Now everytime the handbreak is disengaged the arm moves back to about a mm before the stop part then the cable covering starts to move away from the part that holds the cable onto the caliper revealing a small amount of cable on the opposite side to the c-clip. I dont really want to open the epb as i have heard that both disconnecting the battery and/or pulling the yellow release cable both ends up with warning lights on the dash and the handbreak needing to be reprogrammed/reset.

Is there anyway to sort this out or do i need a new cable as the garage want me to get a whole new unit.
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post #15 of 45 (permalink) Old 30th October 2013
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Re: Grand Scenic Electronic Handbrake Stripdown Plus Photos

Will a hose clamp not work?

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