Uneven braking rear right.
08-08-2017, 03:25 AM
#1
Burning Brakes
Thread Starter
Uneven braking rear right.
Hi,
Just passed the annual official inspection without any problems but only one note.
After the brake test the guy says that the machine tells that the rear right side is not braking as it should, is less than the right side.
Discs are ok, pads have about 2 years, Porsche original, with maximum 2000kms on.
So, considering I believe the machine results, although I don’t feel that problem when driving/braking, I would like your advises where to start to solve this matter.
Thanks in advance.
Regards
Just passed the annual official inspection without any problems but only one note.
After the brake test the guy says that the machine tells that the rear right side is not braking as it should, is less than the right side.
Discs are ok, pads have about 2 years, Porsche original, with maximum 2000kms on.
So, considering I believe the machine results, although I don’t feel that problem when driving/braking, I would like your advises where to start to solve this matter.
Thanks in advance.
Regards
08-08-2017, 03:31 AM
#2
Rennlist Member
Take the brake calipers off and check that everything moves freely (especially the piston and it's boot has no cracks).
They did not talk about the parking brake, correct? This is more common issue with the parking brake.
You won't notice this under normal driving. Most braking force is produced by the front brake calipers.
They did not talk about the parking brake, correct? This is more common issue with the parking brake.
You won't notice this under normal driving. Most braking force is produced by the front brake calipers.
08-08-2017, 03:50 AM
#3
Burning Brakes
Thread Starter
Take the brake calipers off and check that everything moves freely (especially the piston and it's boot has no cracks).
They did not talk about the parking brake, correct? This is more common issue with the parking brake.
You won't notice this under normal driving. Most braking force is produced by the front brake calipers.
They did not talk about the parking brake, correct? This is more common issue with the parking brake.
You won't notice this under normal driving. Most braking force is produced by the front brake calipers.
08-08-2017, 09:08 AM
#4
Drifting
If you had the Brembo 4 pot calipers then I would have suspected lift of the pad support plates caused by corrosion, which can jam the pads. I don't think you have those on your early car unless someone has upgraded them in past?
But performance of the Caliper depends critically on condition of the piston, dust boot and square-cut piston seal. I would remove the caliper with degraded performance. Before removal you can inspect for cracks/tears in dust seal which allows in dirt/brake dust and impedes piston movement, and/or causes corrosion of piston surface which needs to be smooth. With caliper removed you can check how smoothly/easily it operates with compressed air. After that you can rebuild caliper by driving out piston and replacing or cleaning up, and replace the piston seal (braking performance depends a lot on springiness of seal pulling piston back when brakes released).
Rebuilding all calipers and replacing all flexible hoses on my S4 was best job I ever did in terms of improvement (new motor mounts run it close and new shocks!). The pedal feel and stopping power is now fantastic, so I am convert to idea of complete brake overhaul on what are now 20-40 year old cars.
But performance of the Caliper depends critically on condition of the piston, dust boot and square-cut piston seal. I would remove the caliper with degraded performance. Before removal you can inspect for cracks/tears in dust seal which allows in dirt/brake dust and impedes piston movement, and/or causes corrosion of piston surface which needs to be smooth. With caliper removed you can check how smoothly/easily it operates with compressed air. After that you can rebuild caliper by driving out piston and replacing or cleaning up, and replace the piston seal (braking performance depends a lot on springiness of seal pulling piston back when brakes released).
Rebuilding all calipers and replacing all flexible hoses on my S4 was best job I ever did in terms of improvement (new motor mounts run it close and new shocks!). The pedal feel and stopping power is now fantastic, so I am convert to idea of complete brake overhaul on what are now 20-40 year old cars.
