Anyone replaced the vacuum booster hose on these before? Its the vacuum check valve that Mercedes only sells with the whole long poly line that runs from the brake booster to the intake manifold. I tried to cut that (cracked) vacuum valve out and splice in a piece of hose but no matter how tight the hose and clamps it seemed to leak vacuum and start stalling. Im going to have to order this line it appears, but it kind of looks like a pain to install. It runs under a bracket that has wires running across it. Those engines must be very toucy when it comes to vacuum. I guess splicing in a piece of hose wont work. That little vacuum valve must be more important than I thought. Well, if anyone has replaced this part let me know any tips. It going to be minus 15 here in Minnesota this weekend, and I need to get this car fixed soon.