Revs increase when brake pedal applied...

[Neil Thompson]

... then stalls when gear selected.

230SL Auto with PAS, restored car thats been stood with poor fuel, see my other post re elec fuel pump.

I've cleaned all the fuel lines, set the points, adjusted the ignition timing and also adjusted the linkages/venturi as per the basic linkage tour on the forum. The car runs well and idles ok at around 800rpm. If I press the brake pedal the revs rise to around 1,300rpm, if i then put it into gear it stalls. There are some things in the tech manual I haven't tried to test yet such as the WRD and the CSV as I've ran out of daylight but I thought I would just throw my problem out to the experts hoping for a quick fix. Could the mixture just be too rich on tickover or could the servo be dodgy?

as always, any help welcomed

Regards Neil

[stickandrudderman]

The search function is feeling hurt that you are ignoring it!

[Neil Thompson]

I've searched Colin, but sometimes it's good to talk!

Neil

[dpreston Virginia]

Sounds to me like a bad brake booster.,

[ejboyd5]

Plug the vacuum connection to  the brake booster to see if the problem goes away.

[rgafitanu@gmail.com]

I had the same thing,it is a leak in the brake booster. Take it to NAPA, they will rebuild it for about $100. Anything else on the internet and ebay is very expensive.

Radu

[Rolf-Dieter ✝︎]

Colin is right ... Look at the search results

Here ----> http://www.sl113.org/forums/index.php?action=search2

Let us know how you made out, not just for us also for others that will use the search in future years.


Dieter

[Cees Klumper]

I had the same thing,it is a leak in the brake booster. Take it to NAPA, they will rebuild it for about $100. Anything else on the internet and ebay is very expensive.
Radu

Good advice, except TS is located in UK where NAPA may not exist ...

[Pinder]

I had the same issue. Was brake booster. I got mine from Rockauto. If Napa rebuilds original that would be a good option. Rockauto was pretty cheap at around 100 with core refund.

[Pawel66]

Just a voice here and if you find it contrary to forum's wisdom, please ignore it.

I had the same thing - revs changed as the brake pedal was pressed. Before a major booster overhaul I replaced a simple oring between the booster and brake master cylinder. The symptoms are gone. Revs do not change.

I was reading Haynes and I spotted a sentence that this oring needs to be "vacuum tight" and needs to be renewed while working on booster. So I did that.

Pawel