Fix My Lamborghini
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BRAKE VACUUM LINE

Problem - I am trying to get more vacuum to my brake booster. After removing the vacuum hose from the actual booster, I realized that I am not getting enough suction from the hose that comes from the engine to the booster. Normally a cars engine will run rough or try to stall when a vacuum hose like this is unplugged, but it virtually made no difference on my Jalpa when I tried this. The valve pipe I am speaking about is located in the second picture and it connects close to the Y piece just before the engine. One of those hoses from the Y piece connects to the vacuum tank in the trunk and the other runs up the front to the booster. In the parts manual it calls this a brake pipe. I removed it to see if it would improve the braking and I think it may have but only a little. I just want to know why they would use this as it is a restriction on the amount of vacuum.
Possibility - That is a 1-way valve. It allows the vacuum to be stored in the tank. If you shake it, you should hear a little metal ball rattling around in it. Look on the fat part of the 1-way valve and you should see an arrow on it. If you want to determine if you have a leak in your hose (from the Y pipe to the brake booster), plug the hose end at the brake booster and hook a vacuum source to the other end at the Y-Pipe (one of those brake bleeders works great). Generate the vacuum and watch the gauge. If if won't hold a vacuum, then you have a leak in your hose.
I take it you have a newer Jalpa that has the single brake booster and not an earlier version (like mine) that had twin Benditalia boosters (one behind each head lamp)?
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  • Urus
  • Huracan
  • Aventador
  • Gallardo
  • Murcielago
  • Diablo
  • LM002
  • Jalpa/Silh.
  • Countach
  • URRACO
  • JARAMA
  • ISLERO
  • Espada
  • MIURA
  • 350 400 GT