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1976 240D 115 Pumpkin Orange 700,000+ miles and rising!
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49 Posts
Discussion Starter #1
I just replaced my rear passenger side brake hose and it is time to bleed it.

Ill say it - I am lost. The Haynes manual outlines how to do it with an assistant and I am trying to do it with my might vac.

I am hooking my vac up over the bleed valve (circled red) and now what? It says to turn the bleed valve 3/4 turn depress pedal etc etc. I should be able to attach to the bleed pump the vac to have some vac pressure - open the value and vac till no air. This is at least what I have seen on youtube.

My question is - do i actually try and turn the valve that i hook my pump up to? It doesnt look like it is actually threaded to turn. The pic is bad and I can take a closer one if need be.

Thanks!
 

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64' 220SEc, 72' 300SEL 6.3, lots of parts
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512 Posts
Please replace ALL those hoses. front/rear
If you haven't done so in the last 6-10 years

Then you get fresh fluid throughout the system.

They swell / shrink internally and will compromise the
excellent braking ability of the car.

Volume AND pressure is correct with new hoses,
 

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73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
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2,280 Posts
Before turning anything, WD40 the hell out of that fitting. If you break it off, you're screwed. Use a box wrench to undo it too (the closed/circular part of the wrench) or you risk rounding the corners off.
 

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1976 240D 115 Pumpkin Orange 700,000+ miles and rising!
Joined
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49 Posts
Discussion Starter #4
Before turning anything, WD40 the hell out of that fitting. If you break it off, you're screwed. Use a box wrench to undo it too (the closed/circular part of the wrench) or you risk rounding the corners off.
This is great advice - thanks. It is one thing I do no matter what. Before I work on anything on this car - I coat it generously with liquid wrench and let it sit for several hours to over night.

I figured it out - was just not paying attention that the bleeder valve itself was threaded. Hooked my mighty vac up to it applied vacuum turned it 3/4 turn and watched the fluid flow. Once a nice solid stream locked the bleeder valve back down and breaks are back to 100% now.
 
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