Brake Booster Vacuum Sensor Replacement WIS procedure - Mercedes Benz SLK Forum

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Brake Booster Vacuum Sensor Replacement WIS procedure

I'm looking replace the brake booster vacuum sensor on my SLK. Access to it looks difficult without a lot of disassembly to get yours hands in! I was wondering if someone with WIS access might be able to get me the relevant working instructions for replacement of this part please?

The sensor part number is A007 542 03 18.

Thanks in advance!

Col
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@Col No problem finding the sensor in the EPC but have searched WIS and cannot find the instructions you are looking for. If you post your VIN perhaps @i860 can have a look for you.
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I can't find it but I found this.
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#4 Old 1 Week Ago
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Quote:
Originally Posted by MartinatMersea View Post
@Col No problem finding the sensor in the EPC but have searched WIS and cannot find the instructions you are looking for. If you post your VIN perhaps @i860 can have a look for you.
Quote:
Originally Posted by i860 View Post
I can't find it but I found this.
Thanks very much for your efforts in helping me with this guys!

The panic is over now as I replaced the sensor last night within 5 minutes. I was initially concerned that I wouldn't be able to get enough access to do it without a lot of disassembly because the sensor is low down on the brake booster and although visible is obstructed by the brake lines, engine bay fuse box, etc.

On inspecting the new sensor I bought (Ł25 if anyone was wondering) it became clear that the item was designed press in with an interference fit into a rubber bushing in the brake booster. As it was difficult to get your hands in I fed a loop of wire down around the back of the sensor and was able to pull it out with that!

After that there is enough slack on the cable to bring the sensor up higher and disconnect it. After fitting the new sensor onto the cable/connector the last hurdle was to press the new sensor into the bushing described earlier. It's not easy to get much access by hand but luckily for me my hands were just small enough to get in and pop it into place, the backs of my hands took bit of beating in the process but it went in without too much of a fight.

My code reader had identified an error under the heading "adaptive braking system" - check vacuum supply. Knowing my brakes appearing to be functioning ok I suspected the sensor had gone duff. I'd also lost ECO stop/start because vacuum supply to the brake booster is one of the pre-conditions for that working too!

After a quick test run last night ECO stop/start operated again but the errors needed clearing manually. I will re-scan the car in a few days after I've done a few (hundred) miles on it!

Thanks again
Col
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