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Try to pump it to build up the pressure.
Very common, as long as the brake pedal comes back up after the engine is started its good. It takes a second for the brake booster to build up pressure.
The brakes will remain on, air pressure is required to release the brakes
Air stuck in the brake lines cause the peddle to feel "spongy". Your braking distance will dramatically increase with air in the system. When you apply the brakes in a vehicle that has no air in the system, that pressure added with the pressure from the master cylinder presses the brake pads against the rotor or drum causing you to stop. When there is air in the brake system and you apply the brakes some of that pressure is used up by compressing the air in the system and the rest is trying to stop the vehicle.
Pressure build up due to restricted orifice.
Which pressure. - More info gets a better answer.
No, they use air pressure or actually the lack of air pressure to stop the vehicle. The brakes are fully on until pressure builds up in the tank releasing the brakes. When you push the brake pedal this removes air from the system and applies the brakes.
Exhaust or vent gas may be released if a valve is dismantled from an oil pipe system. This is produced as pressure build up in the system over time and can result in rapid pressure release.
pressure
Parking brake is on, Brake fluid is low, Hydraulic failure of the brake system.
If the rear brakes are drum brakes, then there could be a leaky wheel cylinder. The wetness inside the drum will cover all the brake shoes and parts and cause the wheel to lock up when applied. The build of pressure could be due to the wheel cylinder leaking and causing a pressure loss, but rising when the brakes are applied or pumped up. This may/may not be your case, but definitely worth checking the rears.
piston binding in caliper due to dirt or foren debrie or on the slides or hydrolic problem with brake system like brake hoes bad on inside causing pressure to stay.