Help identifying leaking brake component

[zb]

Car (Mercedes A Class) has been parked up outside since 7th October, went to go for a drive yesterday, and the brake pedal just about went to the floor. Had a look around and found wetness at offside rear caliper, put a tray under the location and checked brake fluid level, it was low but still above minimum.

Had stuff to do yesterday (sans car), left it until this morning to have a proper look with car up and wheels off, this is what I found:




Anyone identify what it is that's leaking? I'm reasonably handy with a spanner, so if It's something that could be tightened, or replaced without bleeding I'm OK tackling it, anything else, and I'll get the professionals in.

Brakes were replaced all-round this time last year. It's been through service and MOT since, no issues. I've not noticed any deterioration either.

Thank you.

[GreenV8S]

Hard to tell from that picture but it may be a load compensating valve ie a device to change the brake balance depending on the weight in the back of the vehicle.

If it's leaking spontaneously it's most unlikely to be a loose union and you can expect it will need removing and either replacing or having new seals fitted. That will obviously involve flushing and bleeding the brakes.

[vw_99]

Do the other 2 plastic looking pipes connect into the black box thing?

Looking at the clip where its leaking looks as if it could be where the hard brake pipe joins the rubber felxi pipe.

[zb]

Thanks guys, appreciated. I'm of a mind to leave it alone with what you've said. I've cleaned, dried and painted some Bilt Hamber deox gel over the area, hopefully that'll help whoever has a go at it in the morning.

In the meantime, I'll tackle anything that looks like corrosion on the body frame, I'm aware how insidious brake fluid can be, don't want a minor inconvenience to develop into a disaster, zinc primer and Bilt Hamber bodywork wax should take care of that, after the zinc has dried.

A couple more images, which might give you a bit more of an idea where the leak is in relation to everything else.




Thanks again.

[hellorent]

Looks like metal pipe to rubber pipe connection leaking, top it up with fluid and get someone to pump pedal and then have a look to see leak.

[vw_99]

Hopefully just the flexi leaking. But looks like it might be above the join on the front to back hard pipes.