Hi Forum
I have a soft pedal on my NV300 registered 2017 and I require the forums help. The van recently went for an MOT and I noticed the soft pedal then. The van failed the MOT on the front discs. I replaced the discs and when I tried the brakes I still had a soft pedal. I bled the brakes starting at the back and no air was present. I know I don't have any brake fluid leaks. Looking on the internet I found the the possible cause was a leaking master cylinder. I was unable to purchase a new one, so I purchased a used one and installed and still have the same issue. What I cannot say for sure is that the replacement master cylinder doesn't have the same fault. Assuming the master cylinder is okay, I thought it might be the vacuum cylinder. With the break pressed and the engine started the pedal will go to the floor which is due to the vacuum assist. I have also run the engine and then stopped it and can get at least 3 assisted pedals. This I believe eliminates the vacuum cylinder. So I am now thinking it could be the ABS with a possible seal leak. Does anyone know how I can mechanically test it. If I have miss diagnosed the problem then I look forward to members comments.