Rear brakes dragging
First I have limited experience with Audi, as this is a friends car. I
have Audi A4 and went through the experience of trying to replace the rear brake pads. I know that the pistons have to be rotated back into the calipers and I was (I think!) successful at that. Prior to replacing the pads, the brakes worked fine. So here's the problem. On the drivers' rear wheel, I back off the piston just enough to get the new pads into the caliper, around the disk. I made no attempt to back the piston all the way into the caliper ( was that a mistake?). I did the same on the passenger side, but probably backed the piston further into the caliper on this one. Got everything back together, pumped the brake pedal a few times ( rather hard to insure that the pads were somewhat settled ). I then backed the car down the driveway, which is VERY steep and at the bottom of the driveway applied the brakes quickly and hard, hoping to: 1) insure they were working, and 2) to adjust them ( in the same manner as american cars in the past - which may again be another error ). At that point the car was driven about 7 miles (by the friend) and at the end of the trip, which was stop and go on california freeway, the rear brake - particularly on the driver's side, was smoking. Also noted when the car was returned, that parking brake had very limited travel ( sounds like it was overadjusted??). I have since disassembled both rear side, backed the piston all the way in and 'gently' backed out of garage. All seems better, although there is still a slight 'burned pad smell' but that is declining with time. I think the smell is left over glazing, although braking is fine at this point. Parking brake adjustment is now okay. I have reread the service manual ( which I have and used! ) and I see nothing about backing all the way in, nor any comment on adjusting the pads themselves. I have verified the the parking brake adjustment. Comments - Suggestions? Does anyone know what I did wrong? ( I know I am probably asking for a large 'ration' here but other's opinions are useful!) Steve |
Re: Rear brakes dragging
stvnjns wrote:
> I then > backed the car down the driveway, which is VERY steep and at the bottom > of the driveway applied the brakes quickly and hard, hoping ... to adjust them ( in the > same manner as > american cars in the past - which may again be another error ). It is in error. This applied to self-adjusting *drum* brakes. It does nothing at all on a disk brake. > Comments - Suggestions? Does anyone know what I did wrong? ( I know I > am probably asking for a large 'ration' here but other's opinions are > useful!) What you did wrong was not pay someone to do this * job*. I am not criticizing you. It sounds as if you pretty much know what you're doing. I, too, am a reasonably competent amateur mechanic, but this is one job I *will not do*. These brakes suck out loud. It is a stupid design in a number of ways and the only way to be sure they're properly installed is to have someone with the expertise - and the responsibility to redo it if they screw it up - do the job. When I discovered that my Jaguar X-Type shares the same design, I ponied up the obscene number of US dollars it took to have the dealership change the rear pads. Then I went home and changed the pads on my Jeep - just like I do on my BMW - and just as I plan to do on the front end of the Jaguar. Some things just aren't worth the aggravation. Working on Audi rear disks is one of those things. -- C.R. Krieger (Been there; done that.) |
Re: Rear brakes dragging
stvnjns wrote:
> I then > backed the car down the driveway, which is VERY steep and at the bottom > of the driveway applied the brakes quickly and hard, hoping ... to adjust them ( in the > same manner as > american cars in the past - which may again be another error ). It is in error. This applied to self-adjusting *drum* brakes. It does nothing at all on a disk brake. > Comments - Suggestions? Does anyone know what I did wrong? ( I know I > am probably asking for a large 'ration' here but other's opinions are > useful!) What you did wrong was not pay someone to do this * job*. I am not criticizing you. It sounds as if you pretty much know what you're doing. I, too, am a reasonably competent amateur mechanic, but this is one job I *will not do*. These brakes suck out loud. It is a stupid design in a number of ways and the only way to be sure they're properly installed is to have someone with the expertise - and the responsibility to redo it if they screw it up - do the job. When I discovered that my Jaguar X-Type shares the same design, I ponied up the obscene number of US dollars it took to have the dealership change the rear pads. Then I went home and changed the pads on my Jeep - just like I do on my BMW - and just as I plan to do on the front end of the Jaguar. Some things just aren't worth the aggravation. Working on Audi rear disks is one of those things. -- C.R. Krieger (Been there; done that.) |
Re: Rear brakes dragging
stvnjns wrote:
> I then > backed the car down the driveway, which is VERY steep and at the bottom > of the driveway applied the brakes quickly and hard, hoping ... to adjust them ( in the > same manner as > american cars in the past - which may again be another error ). It is in error. This applied to self-adjusting *drum* brakes. It does nothing at all on a disk brake. > Comments - Suggestions? Does anyone know what I did wrong? ( I know I > am probably asking for a large 'ration' here but other's opinions are > useful!) What you did wrong was not pay someone to do this * job*. I am not criticizing you. It sounds as if you pretty much know what you're doing. I, too, am a reasonably competent amateur mechanic, but this is one job I *will not do*. These brakes suck out loud. It is a stupid design in a number of ways and the only way to be sure they're properly installed is to have someone with the expertise - and the responsibility to redo it if they screw it up - do the job. When I discovered that my Jaguar X-Type shares the same design, I ponied up the obscene number of US dollars it took to have the dealership change the rear pads. Then I went home and changed the pads on my Jeep - just like I do on my BMW - and just as I plan to do on the front end of the Jaguar. Some things just aren't worth the aggravation. Working on Audi rear disks is one of those things. -- C.R. Krieger (Been there; done that.) |
Re: Rear brakes dragging
stvnjns wrote:
> I then > backed the car down the driveway, which is VERY steep and at the bottom > of the driveway applied the brakes quickly and hard, hoping ... to adjust them ( in the > same manner as > american cars in the past - which may again be another error ). It is in error. This applied to self-adjusting *drum* brakes. It does nothing at all on a disk brake. > Comments - Suggestions? Does anyone know what I did wrong? ( I know I > am probably asking for a large 'ration' here but other's opinions are > useful!) What you did wrong was not pay someone to do this * job*. I am not criticizing you. It sounds as if you pretty much know what you're doing. I, too, am a reasonably competent amateur mechanic, but this is one job I *will not do*. These brakes suck out loud. It is a stupid design in a number of ways and the only way to be sure they're properly installed is to have someone with the expertise - and the responsibility to redo it if they screw it up - do the job. When I discovered that my Jaguar X-Type shares the same design, I ponied up the obscene number of US dollars it took to have the dealership change the rear pads. Then I went home and changed the pads on my Jeep - just like I do on my BMW - and just as I plan to do on the front end of the Jaguar. Some things just aren't worth the aggravation. Working on Audi rear disks is one of those things. -- C.R. Krieger (Been there; done that.) |
Re: Rear brakes dragging
C.R. Krieger wrote: > > What you did wrong was not pay someone to do this * job*. I am not > criticizing you. It sounds as if you pretty much know what you're > doing. I, too, am a reasonably competent amateur mechanic, but this is > one job I *will not do*. Weird. I found it to be fun and easy. > These brakes suck out loud. Heh. > It is a stupid > design in a number of ways and the only way to be sure they're properly > installed is to have someone with the expertise - and the > responsibility to redo it if they screw it up - do the job. Not necessarily true. The *proper tools* to do the job are required. Expertise - that's also necessary, but it can be passed along via written instructions (with pictures is nice, but without works.) > Some things just aren't worth the aggravation. Working on > Audi rear disks is one of those things. I've never once had a problem after doing this job, but I'm careful, do a thorough job, and don't scrimp in any area. The cam for the handbrake actuator can stick if not properly cleaned and lubed. The guide pins can stick if not properly cleaned and lubed. I've found what happens is that folks just don't clean this stuff when they are doing a caliper rebuild. It takes me about a half hour to disassemble, clean, lube and reassemble a pair of rear calipers. Screwing the piston all the way back in, with the proper tool, helps make sure all goes well. While I would prefer that the rears have the same design as BMW or Porsche, I've never had any trouble with calipers that I've rebuilt and installed, and I'm no pro mechanic. E.P. 1995 UrS6 |
Re: Rear brakes dragging
C.R. Krieger wrote: > > What you did wrong was not pay someone to do this * job*. I am not > criticizing you. It sounds as if you pretty much know what you're > doing. I, too, am a reasonably competent amateur mechanic, but this is > one job I *will not do*. Weird. I found it to be fun and easy. > These brakes suck out loud. Heh. > It is a stupid > design in a number of ways and the only way to be sure they're properly > installed is to have someone with the expertise - and the > responsibility to redo it if they screw it up - do the job. Not necessarily true. The *proper tools* to do the job are required. Expertise - that's also necessary, but it can be passed along via written instructions (with pictures is nice, but without works.) > Some things just aren't worth the aggravation. Working on > Audi rear disks is one of those things. I've never once had a problem after doing this job, but I'm careful, do a thorough job, and don't scrimp in any area. The cam for the handbrake actuator can stick if not properly cleaned and lubed. The guide pins can stick if not properly cleaned and lubed. I've found what happens is that folks just don't clean this stuff when they are doing a caliper rebuild. It takes me about a half hour to disassemble, clean, lube and reassemble a pair of rear calipers. Screwing the piston all the way back in, with the proper tool, helps make sure all goes well. While I would prefer that the rears have the same design as BMW or Porsche, I've never had any trouble with calipers that I've rebuilt and installed, and I'm no pro mechanic. E.P. 1995 UrS6 |
Re: Rear brakes dragging
C.R. Krieger wrote: > > What you did wrong was not pay someone to do this * job*. I am not > criticizing you. It sounds as if you pretty much know what you're > doing. I, too, am a reasonably competent amateur mechanic, but this is > one job I *will not do*. Weird. I found it to be fun and easy. > These brakes suck out loud. Heh. > It is a stupid > design in a number of ways and the only way to be sure they're properly > installed is to have someone with the expertise - and the > responsibility to redo it if they screw it up - do the job. Not necessarily true. The *proper tools* to do the job are required. Expertise - that's also necessary, but it can be passed along via written instructions (with pictures is nice, but without works.) > Some things just aren't worth the aggravation. Working on > Audi rear disks is one of those things. I've never once had a problem after doing this job, but I'm careful, do a thorough job, and don't scrimp in any area. The cam for the handbrake actuator can stick if not properly cleaned and lubed. The guide pins can stick if not properly cleaned and lubed. I've found what happens is that folks just don't clean this stuff when they are doing a caliper rebuild. It takes me about a half hour to disassemble, clean, lube and reassemble a pair of rear calipers. Screwing the piston all the way back in, with the proper tool, helps make sure all goes well. While I would prefer that the rears have the same design as BMW or Porsche, I've never had any trouble with calipers that I've rebuilt and installed, and I'm no pro mechanic. E.P. 1995 UrS6 |
Re: Rear brakes dragging
C.R. Krieger wrote: > > What you did wrong was not pay someone to do this * job*. I am not > criticizing you. It sounds as if you pretty much know what you're > doing. I, too, am a reasonably competent amateur mechanic, but this is > one job I *will not do*. Weird. I found it to be fun and easy. > These brakes suck out loud. Heh. > It is a stupid > design in a number of ways and the only way to be sure they're properly > installed is to have someone with the expertise - and the > responsibility to redo it if they screw it up - do the job. Not necessarily true. The *proper tools* to do the job are required. Expertise - that's also necessary, but it can be passed along via written instructions (with pictures is nice, but without works.) > Some things just aren't worth the aggravation. Working on > Audi rear disks is one of those things. I've never once had a problem after doing this job, but I'm careful, do a thorough job, and don't scrimp in any area. The cam for the handbrake actuator can stick if not properly cleaned and lubed. The guide pins can stick if not properly cleaned and lubed. I've found what happens is that folks just don't clean this stuff when they are doing a caliper rebuild. It takes me about a half hour to disassemble, clean, lube and reassemble a pair of rear calipers. Screwing the piston all the way back in, with the proper tool, helps make sure all goes well. While I would prefer that the rears have the same design as BMW or Porsche, I've never had any trouble with calipers that I've rebuilt and installed, and I'm no pro mechanic. E.P. 1995 UrS6 |
Re: Rear brakes dragging
Well Thanks to you both - I have noticed that many people have had
issues with these calipers, whether as a result of their own inexperience or due to the calipers. The service manual was limited help ( A standard Audi manual, not after market ) In response to 'cleaning', I did clean and lube. Although it says nothing about it in the Audi service manual, there seems to be (based on web pages and responses elsewhere) an implied requirement to retract the pistons COMPLETELY back into the caliper. It is not clear how this is determined nor is there any real comment on having to do this. In past experience, with non-Audi brakes, simply retracting the piston far enough to allow the new pads to clear the disk was sufficient. I really think that not fully retracting the piston was the error that I made, so if anyone else can think of anything else that I may have done wrong, I will assume that was my fault and move on. Thanks for the responses - didn't think I would get any for a while there! Steve |
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