brake problem?
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Intermediate
Joined: May 2012
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brake problem?
I just had the original calipers rebuilt with o-rings SS sleeves. I've bleed the brakes to a firm pedal. When I turn on the engine and the booster kicks in the pedal goes to the floor. If I turn off the engine the pedal is firm again. What the heck is going on. Is the booster bad?
Thread Starter
Intermediate
Joined: May 2012
Posts: 29
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Bench Bleeding
What I find real interesting is if you bench bleed the MC and then hook it up to a system with air in it, the air will move up into the MC negating the bench bleed. I've bled the system three times now and still have soft pedal with engine running. Thsi is a real pain, I'd rather bleed an old VW!!!! Of course rather drive the vet. The thread by Tom with all of the information is amazing.
Thread Starter
Intermediate
Joined: May 2012
Posts: 29
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Okay here's the real deal!!!! To facilitate a bench bleed I jacked up the rear of the car to the point where the master cylinder was level. I pumped the pedal and watched the bubbles come flying into the resevoir, after they stopped I bleed the system starting with the right rear inside, then out side, left rear inside then outside. The the fronts. I bled the brakes over three days untill I saw not more micro bubbles coming out. I was surprised how many little itty-bitty air bublles came out. I also beat on the calipers with a rubber mallet to get the air a moving. When all was done I had a nice firm pedal with about an inch of play. When I start the engine yes the pedal moves down further but you must remember that due to booster helping it will move easier. I live up on a ridge in Tennessee so it's down hill all the way, scary to think I have to try the brakes under such conditions. But when I back out of the garage and tap the brakes it stops, so I'm pretty sure I won't take on any trees!!!!
