Brake judder problem
Thread Starter
Rennlist Member
Joined: Jun 2005
Posts: 10,579
Likes: 1,030
From: Oman
Brake judder problem
Well the fun continues. Having replaced the tie rods and quite a few other things the test drive told me the judder I had hoped would disappear was still present.
I had my suspicions the issue was nothing to do with the track rods and I was proved correct. I had the front pads out earlier and inspected everything up front so was sure the problem was not there but I noticed that my rear discs did not seem to be cleaning themselves correctly- why I have no idea so I decided to clean everything up.
What I noticed was that the rear discs did not have any counter sunk screws securing them to the hub and on the drivers side once the pads were out the disc was floating. This made me wonder if some crud had got on the disc to hub flange causing a misalignment.
So, for the driver's side I unbolted the caliper and removed the disc- cleaned everything up and gave the disc a rub with some wet and dry.
Now, my experience on the front brakes fitting new dampers was excellent- I have cursed my Hawk pads for years as being too "squeally" but new dampers have stopped that issue. So for the rear brakes as I did not have new dampers available I coated the things with a smear of silicon RTV and used Ken's bump stick to hold the things while I pressed the dampers into the piston. Quickly inserted the pads and then compressed them to seat the dampers on the pads and left it to go off in as much as RTV does- hopefully it will work.
Put everything back together and seems as though the judder has disappeared. On the downside my problem with the seats rocking back and forth a bit has reappeared [due to the braking force]!
Next problem to solve.
Regards
Fred
I had my suspicions the issue was nothing to do with the track rods and I was proved correct. I had the front pads out earlier and inspected everything up front so was sure the problem was not there but I noticed that my rear discs did not seem to be cleaning themselves correctly- why I have no idea so I decided to clean everything up.
What I noticed was that the rear discs did not have any counter sunk screws securing them to the hub and on the drivers side once the pads were out the disc was floating. This made me wonder if some crud had got on the disc to hub flange causing a misalignment.
So, for the driver's side I unbolted the caliper and removed the disc- cleaned everything up and gave the disc a rub with some wet and dry.
Now, my experience on the front brakes fitting new dampers was excellent- I have cursed my Hawk pads for years as being too "squeally" but new dampers have stopped that issue. So for the rear brakes as I did not have new dampers available I coated the things with a smear of silicon RTV and used Ken's bump stick to hold the things while I pressed the dampers into the piston. Quickly inserted the pads and then compressed them to seat the dampers on the pads and left it to go off in as much as RTV does- hopefully it will work.
Put everything back together and seems as though the judder has disappeared. On the downside my problem with the seats rocking back and forth a bit has reappeared [due to the braking force]!
Next problem to solve.
Regards
Fred
Thread Starter
Rennlist Member
Joined: Jun 2005
Posts: 10,579
Likes: 1,030
From: Oman
Whilst pulling the rear suspension for the dog bone refurbishment I ended up pulling the passenger side rear disc off that i had previously been blind to. In daylight I was quite surprised to see just ho much deposition remained on the disc surface despite my efforts to clean it both manually and under driving conditions.
I gave the surface a good scour with wet and dry and we will have to see if this has any further positive effect. Was quite noticeable was some kind of imprints of the brake pad faces which I put down to washing the car but not taking it for a spin to dry it off.
Inspection of the discs reminded me that in fact these are the discs that came from my late S4 before it was written off and these discs were made by Zimmerman. One thing I have noticed with this make of disc is that the slightest drop of water on the disc face leaves an orangy hue very quickly as in a matter of minutes.
This made me wonder if anyone else has experienced anything similar.
Rgds
Fred
I gave the surface a good scour with wet and dry and we will have to see if this has any further positive effect. Was quite noticeable was some kind of imprints of the brake pad faces which I put down to washing the car but not taking it for a spin to dry it off.
Inspection of the discs reminded me that in fact these are the discs that came from my late S4 before it was written off and these discs were made by Zimmerman. One thing I have noticed with this make of disc is that the slightest drop of water on the disc face leaves an orangy hue very quickly as in a matter of minutes.
This made me wonder if anyone else has experienced anything similar.
Rgds
Fred
