CarTalk.com Blogs Car Info Our Show Deals Mechanics Files Vehicle Donation

1990 p30 chassis Southwind MH brakes

The brakes on my MH are very poor and seem to be getting worse. I have replaced the fluid (purged) and have no improvement. I seems as though the rear brakes are not effective or have less effect. The front brakes squeal loudly if I stop in traffic several times without a chance to cool off. Could I have a defective master cylinder that would cause the rear brakes to act this way? On first press of the brake I have 1/2 peddle, on one pump I get more peddle and in all cases the peddle dose not drop with continued pressure. I could not come to a panic stop if I had to. Also, could a defective vacuum booster cause this problem?