they do
power brakes are more powerful
Power brake booster is going bad. wont hold vacuum for power brakes to work.
The power steering pump also provides power for the power brakes.
You will still be able to steer the vehicle, but it's going to take lots of extra effort ... same is true of the brakes - more pressure is going to be required if you lose engine power.
I would check the power brake booster
Vacume problem or problem with booster/insufficient fluid, leak check those things.
Front brakes have significantly more stopping power than rear brakes.
If your power brake booster (the large roundish metal thing that the master cylinder is bolted to) either fails or loses its source for vacuum then your brake pedal will become very difficult to push like if you have manual brakes.
slowly push it along then pull the brakes, if it stops, THE BRAKES WORK!!! if it keeps going, THE BRAKES DON'T WORK!!! IT'S ROCKET SCIENCE!!!
no power brakes....harder to stop
Yes, the power brakes should work properly provided that the booster, check valve and hoses are in good condition and is getting the correct vacuum flow from the engine. The vacuum canister is a vacuum reservoir for the HVAC (Heating, Ventilation, Air Conditioning) controls.
Is your brake pedal hard ? If so replace the power brake booster. It sounds like you have a major vaccume leak in the booster when you apply the brakes. Power brakes work off of engine vaccume. If the dieafram is leaking vaccume when you apply the brakes it leans the engine out. ( creates a major vaccume leak ) and engine dies. Hope this helps.