I have another problem. I have EPB on an audi a6 c6 model and have a problem with one motor. I found a bad wire connector at the motor, the motor doesn t worked because of the cable. I took the car at mechanic and he repaired the connector, now my motor works but the wheel wont block. The motor has the sound of a working one but still can t block the whell. The other motor works good, the epb switch work fine only the motor won t block the whell
Another problem EPB
- Thread starter Andrei1987
- Start date
Steveredman
Registered User
Just speculating, but maybe they need to be synced up? Perhaps wind them both all the way out and then try reassembling and holding the epb button. That's what I did when I replaced the rear pads on my A4
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Thanks you for your answer, don t know what means,,wind them both all the way out,, ? My parking brake motor works but don t know it doesn t have anything damaged inside him
Thanks you for your answer, don t know what means,,wind them both all the way out,, ? My parking brake motor works but don t know it doesn t have anything damaged inside him
Steveredman
Registered User
Ok, for starters maybe try holding the epb switch for longer, see if the motors wind further in. There is a way of changing the rear pads without VCDS that I used to replace the rear pads on my A4. You have to remove the motor from the calliper and then use a T40 bit to manually unwind the calliper. Once this was complete I had to hold the epb button for several seconds to get the motors to take up the slack, maybe this will work for you?
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I tried this, wont work. I think i have a damaged motor. I will take tomorrow the right motor and install on the left whell. Se what hapeness, this doesn t seem to be a problem, don t know if i could damage the epb module??
Steveredman, thank you for your time, i will help me a lot a photo of the screw that i need to wind if you could find a motor on the internet and show me.
Steveredman
Registered User
This video shows it, if you disconnect the motor (unfasten 2 screws) then you will see the interface between the motor and the calliper is a T40 Torx connection:-
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Tha
Thank you for your time, i took the motor off today i release de 40 torx and the pads worked and block the wheel but then i put de motor on and tried the electronic brake. The left motor moved about 10 seconds more then the right one and then stoped. I checked the wheel but the motor didn t bkocked the wheel, the i tried moving the 40 torx all the way inside the cakiper put the motor on but still the wheel won t block. Then i left the 40 torx at half distance betwen minimum and maximum but still the wheel won t block. The motor works because moved the posicion of the 40 torx and first time i tried moved for 10 seconds because it didn t know the posicion but then moves normally, about 3 seconds. I have to mencion that the EPB switch has the red color of a good one it doesn t blink, and the right wheel works good but the left one won t block the wheel. Don t know what to do, i have only 1 error with vcds of abs module coding in the parking brake module but that error is because i need a knew abs module, mine doesn t accept the coding, i know that because i went to the dealer.
Thank you for your time, i took the motor off today i release de 40 torx and the pads worked and block the wheel but then i put de motor on and tried the electronic brake. The left motor moved about 10 seconds more then the right one and then stoped. I checked the wheel but the motor didn t bkocked the wheel, the i tried moving the 40 torx all the way inside the cakiper put the motor on but still the wheel won t block. Then i left the 40 torx at half distance betwen minimum and maximum but still the wheel won t block. The motor works because moved the posicion of the 40 torx and first time i tried moved for 10 seconds because it didn t know the posicion but then moves normally, about 3 seconds. I have to mencion that the EPB switch has the red color of a good one it doesn t blink, and the right wheel works good but the left one won t block the wheel. Don t know what to do, i have only 1 error with vcds of abs module coding in the parking brake module but that error is because i need a knew abs module, mine doesn t accept the coding, i know that because i went to the dealer.
Steveredman
Registered User
You've tried everything I would have suggested, and by the fact that after you back it right off it then takes longer to apply the brake it sounds like the motor is trying to do it's job. My only thoughts from here are that either the motor is faulty and not generating enough torque to wind the calliper tight, or that a fault in your calliper is stopping the motor from being able to wind it up all the way. Maybe look into companies that refurbish callipers, there seem to be a few online.
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I think the motor perhaps, but i had stop motor voltage in vcds about 15 amps at both motors, left and right. I had low voltage on left wheel and found a loosen wire i went at one garage that fix cars and solded,now the motor works, but since i don t have low voltage fault and now mi motor works, and stop voltage is about the same for both wheels, don t know what to think, and the epb botton doesnt blinks, when i had the loosen wire blinked every time y put the parking brake. Thanks a lot
Hy steveredeman do you know if i could damage the parking brake module or something if i.try desambling de parking brake motor andthe with the motor off engage the brake, just to see if the motor moves the caliper in the good posicio because i went at a mechanic about 2 months ago and they repair the damage cable of the motor abd i am not sure if they put the cable as it was before, maybe they reversed the cable and now the motor release the caliper when it actually should push the csliper. Do you know if it safe to engage the parking brake with 1 motor off just to see how the motor turns?
Steveredman
Registered User
Hi, I understand what you are thinking but I'm afraid I have no idea what the effect would be or what the risks are. I do think it's likely that if the motor were connected backwards then it would be tightening the calliper when the epb was released.
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Do not run the motor with the caliper removed you will damage the caliper and it will have to be replaced.
Thanks, but i don t undersand how coud tthe motor damage the caliper if i take off the motor and do the test to see how thw motor moves, i don t know if i will experience other issue?
All depends on what you are trying, if you just connecting 12v for a second then you are OK, if you try and cycle the caliper using VCDS or another diag tool then that will damage the caliper.
Warning from ross-tech about performing basic setting on calipers http://wiki.ross-tech.com/wiki/index.php/VW_Passat_(3C)_Parking_Brake
Yes but how do i know if the motor moves in the good direccion, i had a bad connector and they repaired the connector and i think that they put the wiring wrong, because my motor works but didn t blocks the wheel, i moved manually the 40 torx that the piston has when i reached the end of the screw it actually blocked the wheel, but this is manually, don,t know how what to do, the mechanic does n know , the nearest audi dealer is at 350 km, i don t know why the hell won t work?
Steveredman
Registered User
Is the risk that you are highlighting apply only to cycling the epb with the calliper removed? I think Andrei is suggesting cycling the epb with the motor removed from the calliper (to see which direction it rotates in). I can understand why it would be bad to do with the calliper removed as the piston will travel too far with nothing to stop it. Do you think it would be a problem to apply the epb with the motor removed from the calliper?
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Not sure on that one, I've only seen a calipers damaged there the hole unit was removed, and cycled! Personally I would get an auto electrician check the wiring, it easy to get hold of the wiring diagrams and it's only 2 wires so won't cost much to check.
The only problem i m from chile and here the mechanics and electricians are bad don t kknow nothing i went with mi car at a service garage and still the problem existis and doesn t have an answer for the, about diagrams they don t have, i love the live in usa lol
How do i know if the caliper is good or broken?in order to buy only the caliper if it s not the motor, can i have a motor that works but not have the sufficient power to block the wheel?
No idea, I would bite the bullet and just buy a replacement caliper. You have gone above and beyond to try and fix the fault, most people here would have give up a long time ago and got a replacement unit. I had both my units fail and just replaced them, as I needed the car back on the road.
Not sure it will work as i know the motor works because it has the sound of a working motor, and if i put the caliper on and cycle the parking brake and then take the motor off i see that the caliper moved from his posicion, it has a 40 torx inside that change his posicion when i activate the brake. then if i try to move the caliper with a 40 torx scredriver i could move the piston very easy and block the disc, but that is with the screwdriver, with the motor won t work
And vagcom com show only 1 error in the parking brake module. it is an error of coding the abs module in the parking brake module, seems that they are connected. unfortunatly i have a bad abs module, coudt this be a problem?
