If brake fluid is full

There should be no leak.

Two reasons left: 1. master cylinder, 2. Power booster.

You can eleiminate one of the two easily: park the car, without engine running, press break padlle, to feel how hard you have to put on the padle to make it to floor. Start the engine(transmission in park), try to press the brake padle, if it is much easier to push it to floor, then the power booster is good, if the force needed are similar, your power booster is bad.

If power booster is good, then it is the master cylinder, o-rings are used internally, if o-rings are bad, internal leak happens, most likely it is the master cylinder.

所有跟帖： 

• Thanks. I will try it. -kath1236- ♀ (0 bytes) () 09/08/2005 postreply 14:19:37