Brake pedal spongy

[tim the pool man]

I have an issue with the brakes on my work van.

It is a Mercedes Vito, the pedal was getting long about 2 weeks ago, on checking the fluid was low so I topped it up. Since then it has got steadily worse, so I thought air had got in the system.

Thouroughly bled all 4 brakes on the weekend, but still no better.

Fluid level doesn't seem to be going down and I can't see any sign of a leak, I'm now wondering if the master cylinder might be shagged and bypassing...

Don't want to get a kit and overhaul it to find it no better, any advice?

[benlogan]

it could be the master cylinder but i would advise to check the sliders on the calipers bacause they tend to sieze on mercedes vans around that year due to lack of greasing.

[tim the pool man]

I actually reposted this in GG as it was getting no replies... turned out to be the LHF hub nut come loose allowing the disc to move and knock the pads back... easy fixed