Here's my autoscan:
So I’m baffled by the lack of rear breaking on my 2000 Audi A6 (and so is the Audi dealer). 90% of the breaking is on the front and the right rear rotor is only wearing ½ of the disk surface since it’s barely putting any pressure on the pad. It’s generally annoying and unsafe. I acquired this car from a colleague and it’s a great car otherwise. They took pretty good care of it except they never flushed the brake system in 17 years. Here’s the history over the last year since I acquired it:
• Jan-2017: Acquired ‘totaled’ car since owner couldn’t justify $4000 estimate for control arms/subframe damage estimate from Audi. I’m a DIY mechanic so I replaced front control arms, wheel rim and had it aligned. Subframe was fine. Drives perfect, except brakes are spongy and all in the front.
• Jan-2017: I replaced rear calipers (Napa reman), rotors and pads since rear brakes appeared to be ‘frozen’ and not functioning. Bled rear brakes manually using two person method.
• Jan-2017: Had neighborhood Goodyear flush brake system, since I assumed I didn’t bleed them properly. Still spongy and feels like air in system.
• Feb-2017: Goodyear flushed brakes again since they were still spongy. No real improvement but they don’t have VCDS so perhaps air still in the ABS pump?
• Feb-2017: I replaced the master cylinder (OEM) guessing it must be shot after 17 years. Bled master cylinder and system using 2 person manual method. During bleeding, my wife put the pedal to the floor, but that shouldn’t damage a new master cylinder, right?
• Mar-2017: Replaced front calipers (Napa reman), rotors and pads. Why? Because, at this point after 17 years of neglect who knows what debris is in the system and the pads and rotors were shot. Purchased a Motive bleeder and used that to bleed system. Brakes still spongy and all in front.
• Mar-2017: Had Audi dealer flush brake system since I didn’t have VCDS at the time to properly bleed. Drove pretty well for about 3 days, but then went spongy and all in front again.
• July-2017: Replaced RR caliper which was leaking during overnight brake pressure test. Also replaced all brake hoses going to calipers. Bled system using Motive bleeder.
• Aug-2017: Asked Audi to bleed system and officially diagnose lack of rear braking. They agreed braking was mostly in front and claimed it was due to ‘aftermarket’ rear brake pads! They pressure tested and found no leaks and no air in system. That doesn’t explain right rear rotor barely getting pressure! Horseshit.
• Dec-2017: Applied another overnight brake pressure test and found small leak around brake hose caliper bolt. Tightened bolt and Bled system using Motive bleeder, VCDS and WIS procedure (sequence RF, LF, RR, LR). No air in system. New pressure test revealed no leaks. But brakes still spongy and all in front.
• Jan-2018: Maybe the ABS pump seals are shot, so I replaced ABS pump with salvage yard pump. Bled system using Motive bleeder and VCDS using WIS procedure.
• Feb-2018: Asked Midas to look at brakes. They said they found no issues. But brakes still spongy and all in front.
• Mar-2018: Bled system using VDCS, Motive bleeder and WIS procedure. No air bled out. No improvement in braking, still all in front and spongy.
So you can see that Goodyear, Audi, Midas have all looked at this and no one can figure it out. I’m about to replace the master cylinder AGAIN thinking perhaps it was damaged in install and/or all this pressure bleeding has damaged seals between front and back?
Any ideas what could keep the rear brakes from getting pressure and why the brakes are so spongy?
Frustrated!!
Norbert
Code:
Tuesday,06,March,2018,19:34:17:20629
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 17.8.1.0 (x64) HEX-V2 CB: 0.4409.4
Data version: 20171130 DS276.6
www.Ross-Tech.com
Mileage: 121708 Repair Order: Brake Bleed
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Chassis Type: 4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005)
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77
-------------------------------------------------------------------------------
Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 4B0 907 551 L
Component: 2.7l V6/5VT G 0003
Coding: 06652
Shop #: WSC 02325
VCID: 2D040351A404373FC17-513C
4 Faults Found:
17862 - Exhaust Gas Temp Sensor 1 (G235)
P1454 - 35-10 - Short to Ground - Intermittent
17521 - Oxygen (Lambda) Sensor; B1 S1
P1113 - 35-10 - Internal Resistance too High - Intermittent
17883 - EVAP Leak Detection Pump
P1475 - 35-10 - Malfunction / No Signal - Intermittent
17539 - Oxygen (Lambda) Sensor; B2 S1
P1131 - 35-10 - Internal Resistance too High - Intermittent
Readiness: 0000 0000
-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 4B0 927 156 BD
Component: AG5 01V 2.7l5VT USA 3131
Coding: 00002
Shop #: WSC 00000
VCID: 6A8EC84D556AE007E45-513C
No fault code found.
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-111-EDS.lbl
Part No: 8E0 614 111 A
Component: ABS/EDS 5.3 QUATTRO D10
Shop #: BB 24334
VCID: 1C62DE95CFBECEB7A69-51CE
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4B0-820-043-MY1.lbl
Part No: 4B0 820 043 L
Component: A6-Klimavollautomat D64
Coding: 00160
Shop #: WSC 02325
VCID: 2310E569F2C0F14F673-2596
No fault code found.
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4B0-959-655-AI8.lbl
Part No: 4B0 959 655 F
Component: Airbag Front+Kopf 1002
Coding: 00406
Shop #: WSC 02325
VCID: 33301529422061CF973-5118
1 Fault Found:
01211 - Belt Tensioner Igniter; Rear Driver Side (N196)
32-10 - Resistance Too High - Intermittent
-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4B0-907-487.lbl
Part No: 4B0 907 487
Component: E Lenkrad Elektronik D03
VCID: 698CB741506CEB1FEDF-4BBA
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-920-xxx-17.lbl
Part No: 4B0 920 980 M
Component: C5-KOMBIINSTR. VDO D11
Coding: 02264
Shop #: WSC 00000
VCID: 2F381959AE08452FF3B-513C
No fault code found.
-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels:. 4B0-962-258.lbl
Part No: 4B0 962 258 J
Component: Central Lock/Alarm D33
Coding: 15885
Shop #: WSC 02325
VCID: 303A1A25B3365AD7EA1-4EC8
11 Faults Found:
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01572 - Alarm triggered by Door Contact Switch; Passenger Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
00955 - Key 1
09-10 - Adaptation Limit Surpassed - Intermittent
00956 - Key 2
09-10 - Adaptation Limit Surpassed - Intermittent
01574 - Alarm triggered by Door Contact Switch; Rear Right
35-00 - -
01573 - Alarm triggered by Door Contact Switch; Rear Left
35-00 - -
01586 - Locking Cylinder Contact Switch; Passenger Side (F242); Close
29-00 - Short to Ground
01585 - Locking Cylinder Contact Switch; Passenger Side (F242); Open
29-00 - Short to Ground
-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 4B0 959 760 A
Component: Sitzmemory D05
VCID: 2B000D499A10390FDF3-4B00
No fault code found.
-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4B0-919-887-BNS3.lbl
Part No: 4B0 919 887 B
Component: Navigation BNO 0001
VCID: 323E102DBD3A68C79C5-4AE0
1 Fault Found:
65535 - Internal Control Module Memory Error
00-00 - -
-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 4B0-951-178.lbl
Part No: 4B0 951 178 A
Component: Innenraumueberw. D04
Coding: 00101
Shop #: WSC 02325
VCID: 2616FC7D81F2046700D-51A8
No fault code found.
-------------------------------------------------------------------------------
Address 56: Radio Labels: 8D0-035-1xx-56.lbl
Part No: 4B0 035 195 A
Component: Radio D00
Coding: 00205
Shop #: WSC 02325
VCID: 1E66D49DD9A2DCA748D-4B1E
No fault code found.
-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 4B0-919-283.lbl
Part No: 8D0 919 283
Component: Parkingsystem A6 USA D05
Coding: 01126
Shop #: WSC 02325
VCID: 6C82CE555F9EFE37969-51F2
No fault code found.
End----------(Elapsed Time: 04:29, VBatt start/end: 12.3V/12.3V)-----------So I’m baffled by the lack of rear breaking on my 2000 Audi A6 (and so is the Audi dealer). 90% of the breaking is on the front and the right rear rotor is only wearing ½ of the disk surface since it’s barely putting any pressure on the pad. It’s generally annoying and unsafe. I acquired this car from a colleague and it’s a great car otherwise. They took pretty good care of it except they never flushed the brake system in 17 years. Here’s the history over the last year since I acquired it:
• Jan-2017: Acquired ‘totaled’ car since owner couldn’t justify $4000 estimate for control arms/subframe damage estimate from Audi. I’m a DIY mechanic so I replaced front control arms, wheel rim and had it aligned. Subframe was fine. Drives perfect, except brakes are spongy and all in the front.
• Jan-2017: I replaced rear calipers (Napa reman), rotors and pads since rear brakes appeared to be ‘frozen’ and not functioning. Bled rear brakes manually using two person method.
• Jan-2017: Had neighborhood Goodyear flush brake system, since I assumed I didn’t bleed them properly. Still spongy and feels like air in system.
• Feb-2017: Goodyear flushed brakes again since they were still spongy. No real improvement but they don’t have VCDS so perhaps air still in the ABS pump?
• Feb-2017: I replaced the master cylinder (OEM) guessing it must be shot after 17 years. Bled master cylinder and system using 2 person manual method. During bleeding, my wife put the pedal to the floor, but that shouldn’t damage a new master cylinder, right?
• Mar-2017: Replaced front calipers (Napa reman), rotors and pads. Why? Because, at this point after 17 years of neglect who knows what debris is in the system and the pads and rotors were shot. Purchased a Motive bleeder and used that to bleed system. Brakes still spongy and all in front.
• Mar-2017: Had Audi dealer flush brake system since I didn’t have VCDS at the time to properly bleed. Drove pretty well for about 3 days, but then went spongy and all in front again.
• July-2017: Replaced RR caliper which was leaking during overnight brake pressure test. Also replaced all brake hoses going to calipers. Bled system using Motive bleeder.
• Aug-2017: Asked Audi to bleed system and officially diagnose lack of rear braking. They agreed braking was mostly in front and claimed it was due to ‘aftermarket’ rear brake pads! They pressure tested and found no leaks and no air in system. That doesn’t explain right rear rotor barely getting pressure! Horseshit.
• Dec-2017: Applied another overnight brake pressure test and found small leak around brake hose caliper bolt. Tightened bolt and Bled system using Motive bleeder, VCDS and WIS procedure (sequence RF, LF, RR, LR). No air in system. New pressure test revealed no leaks. But brakes still spongy and all in front.
• Jan-2018: Maybe the ABS pump seals are shot, so I replaced ABS pump with salvage yard pump. Bled system using Motive bleeder and VCDS using WIS procedure.
• Feb-2018: Asked Midas to look at brakes. They said they found no issues. But brakes still spongy and all in front.
• Mar-2018: Bled system using VDCS, Motive bleeder and WIS procedure. No air bled out. No improvement in braking, still all in front and spongy.
So you can see that Goodyear, Audi, Midas have all looked at this and no one can figure it out. I’m about to replace the master cylinder AGAIN thinking perhaps it was damaged in install and/or all this pressure bleeding has damaged seals between front and back?
Any ideas what could keep the rear brakes from getting pressure and why the brakes are so spongy?
Frustrated!!
Norbert
