[trex70]

OK, not a camaro, but up at work we are trying to get a guys brakes right for him. He put a new engine in it and while it was out he put in a new booster/mc. Before hand brakes were okay...good pedal. Now very spongy, like there is air in the system, so we used a power bleeder and still no pedal. So we start tp isolate things, we isolated the front calipers and we get a good pedal...so you would think bad calipers...nope tried three different brands same thing. We also re did his booster/mc, put a new proportioning valve on it. We are out of ideas, we have replaced everything. Does anyone have any idea's? It is on a 1990 Plymouth Acclaim...I am thinking a good stick of dynomite is the best solution...any help will be greatly appreciated and an ice cold Miller light to whoever has the correct answer...the next time your in Longview Texas!!

 

[maxharvard]

Ok, calm down... here's what you do....

1. Beer O'clock
2. Nap
3. Zen meditation
4. Check for vacuum leaks to booster

Thats my suggestion

 

[69Project]

I had a similar problem on my Chevelle. Turns out it was the rubber brake lines to the wheels. Check them out. If they have any kind of age, replace them. They will develop very small holes and suck air in. My problem did not come to light until my master cylinder failed.

 

[jasonty]

Agreed. I second the motion to check the rubber brake lines. Even if you can't see any leaks, they still may be bad. Due to them expanding with every push of the pedal, they could give you a spongy pedal if they're worn out. Happened to me...

 

[q2quest]

I seem to remember reading something somewhere about the importance of bench bleeding the MC before installing it. Could air be trapped in the MC itself somehow? Just a thought.