Mightyleader
Member
Morning all,
I'm really frustrated with the brakes on Diane right now, and would love some advice.
Recently, I had the callipers replaced on the front disks as they old ones were causing binding and the pistons were in a sad state.
I had the repair done by a competent local mobile mechanic and I'm more than happy with that work.
Only two issues remained:
I got a lot of information from this page here on A2OC, which led me to these clear directions (reply #10) on what to expect from the process all of which gave me confidence to go ahead.
So I got bleed tubing with non-return valves as directed, got two 11mm ring spanners and took time to set everything up (up on axle stands, front wheels off etc...) I even thought of a novel way to make the bottles to catch the fluid stand up, see pics...
Running through the process in VCDS everything seemed to be fine and I saw little air bubbles in the tubing. I topped up the reservoir as the process went on so it never emptied and the bottles collected just under a litre of fluid as the directions said.
HOWEVER. At the end of the process, when VCDS told me the bleed is complete, the brake pedal felt like it had zero pressure behind it and gently pumping it for time made no difference. I put everything back together and did a gentle test moving forward and back on the drive and sure enough there is ZERO brakes applied.
I can only assume that the process caused a leak, pipe split or maybe even the master cylinder seals to go.
QUESTION 1: Is this a correct assumption (I can't see any leaks dropping down under the car) or is there something I have missed and can do to resolve?
Secondly I still have the ABS/Brake warning light so I ran VCDS again and got the following output, which is clearly not related to the hydraulic system. I have checked the cabling to the sensor, the sensor (as best I can, I mean it's there and doesn't look broken) and the fuse.
QUESTION 2: Are there any common places to check for issues in the wiring?
I'm really frustrated with the brakes on Diane right now, and would love some advice.
Recently, I had the callipers replaced on the front disks as they old ones were causing binding and the pistons were in a sad state.
I had the repair done by a competent local mobile mechanic and I'm more than happy with that work.
Only two issues remained:
- The pedal was soft
- I still have Brakes/ABS warning lights.
I got a lot of information from this page here on A2OC, which led me to these clear directions (reply #10) on what to expect from the process all of which gave me confidence to go ahead.
So I got bleed tubing with non-return valves as directed, got two 11mm ring spanners and took time to set everything up (up on axle stands, front wheels off etc...) I even thought of a novel way to make the bottles to catch the fluid stand up, see pics...
Running through the process in VCDS everything seemed to be fine and I saw little air bubbles in the tubing. I topped up the reservoir as the process went on so it never emptied and the bottles collected just under a litre of fluid as the directions said.
HOWEVER. At the end of the process, when VCDS told me the bleed is complete, the brake pedal felt like it had zero pressure behind it and gently pumping it for time made no difference. I put everything back together and did a gentle test moving forward and back on the drive and sure enough there is ZERO brakes applied.
I can only assume that the process caused a leak, pipe split or maybe even the master cylinder seals to go.
QUESTION 1: Is this a correct assumption (I can't see any leaks dropping down under the car) or is there something I have missed and can do to resolve?
Secondly I still have the ABS/Brake warning light so I ran VCDS again and got the following output, which is clearly not related to the hydraulic system. I have checked the cabling to the sensor, the sensor (as best I can, I mean it's there and doesn't look broken) and the fuse.
Code:
Address 03: ABS Brakes Labels: None
Controller: 8Z0 907 379 D
Component: ESP FRONT MK60 0101
Coding: 0007175
Shop #: WSC 00000
VCID: 49E5B47460A1
2 Faults Found:
00668 - Supply Voltage Terminal 30
002 - Lower Limit Exceeded - Intermittent
00285 - ABS Wheel Speed Sensor; Front Right (G45)
012 - Electrical Fault in Circuit
QUESTION 2: Are there any common places to check for issues in the wiring?