Is there a check valve in the main hose leading to the brake booster?
I had a vehicle way back that would periodically lose the power brake function and scare me half to death. I changed the hose between the booster and the intake (it was a gas engine) and that solved the problem. There was a check valve in the hose that would sometimes stick.
RB On 09/11/2014 9:23 PM, Andrew Strasfogel via Mercedes wrote:
Some of you will recall my write up of the intermittent loss of power braking on my 1983 300TD, coupled with the loss of engine shut off (won't turn off with key). I fiddled with a rubber connector to the brake booster line, and happily the problem disappeared for nearly a week. The issue then resurfaced, but now the following symptoms occur all the time: 1) Power brakes completely gone - must apply extremely forceful pressure on the brake pedal (or petal, if you prefer). 2) Cannot shut off the engine with key - must be done manually 3) Vacuum door locks completely inoperative, even with the engine running. Otherwise, everything else on the car works fine. Whoever is the first to successfully diagnose this problem, based solely on the symptoms enunciated above, wins a coveted "ATTABOY". Good luck. Andrew 1983 300TD No brakes, locks or engine shutoff 1985 300TD CA version _______________________________________ http://www.okiebenz.com
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