Dodge Repair Questions? Ask a Mechanic for Answers ASAP
sounds like the brake booster has a vacuum leak.. when the brake booster leaks it requires replacement
How does that effect the steering? the hissing goes away when I turn the wheel.
HYDRAULIC BOOSTERThe hydraulic booster uses hydraulic pressure from the power steering pump. Before diagnosing a booster problem, first verify the power steering pump is operating properly. Perform the following checks.
NOISESThe hydraulic booster unit will produce certain characteristic booster noises. The noises may occur when the brake pedal is used in a manner not associated with normal braking or driving habits.HISSINGA hissing noise may be noticed when above normal brake pedal pressure is applied, 40 lbs. or above. The noise will be more noticeable if the vehicle is not moving. The noise will increase with the brake pedal pressure and an increase of system operating temperature.CLUNK-CHATTER-CLICKINGA clunk-chatter-clicking may be noticed when the brake pedal is released quickly, after above normal brake pedal pressure is applied 50-100 lbs.BOOSTER FUNCTION TESTWith the engine off depress the brake pedal several times to discharge the accumulator. Then depress the brake pedal using 40 lbs. of force and start the engine. The brake pedal should fall and then push back against your foot. This indicates the booster is operating properly.ACCUMULATOR LEAKDOWN
SEAL leakage If the booster leaks from any of the seals the booster assembly must be replaced.
hope that helps....it s a hydro boost set up
Ok, I have checked everything. There are no leaks, no jerking when steering or change in the break pedal. The pedal still has a boost for a couple of presses after the truck has been sitting. The hiss goes away as soon as you apply pressure to the pedal or to the steering.
its from the hydroboost set up..either jump the gun and replace or wait until it fails