It sounds like you have air in your breaklines. Bleed the brakes to clear the air.
i have no peddle pressure and i already replaced the master cylinder
Check the wheel cylinders - they may be leaking and you can't see it on the outside of the wheel
The entire lift cylinder assembly must be replaced and it is recommended that they be replaced in pairs. The operation is pretty straightforward since all the mounting bolts are exposed and visible.
Defective Master cylinder?
If you have an engine code that is saying misfire on these cylinders it is usually a bad coil on the plugs of those cylinders. You are probably going to need to have them replaced. Check and replace the plugs if necessary.
If you need a cylinder replaced, let a qualified gun smith do it. If it needs to be timed, you won't regret spending the money.
A master cylinder should be replaced when it can no longer provide the pressure needed for the brakes to operate. You can tell it is failing when the pedal becomes soft.
The system could be full of air if it was not bled. Bleed the master cylinder and all four wheel cylinders and see if there is any air.
Did this happen just after an overheat incident? Are the two cylinders adjacent to each other? If so, consider the possibility that you may have a blown head gasket leaking between the two cylinders. To check, first get intake and exhaust valves closed on both cylinders. Then use a cylinder leakdown tester to put air into one cylinder. If it comes out the spark plug hole of the other you have a leak between the two cylinders. If this is the case, remove the cylinder head and examine the head gasket for any sign of damage. If this is a 4 liter inline 6 engine and if the two cylinders in question are #3 & #4 consider the possibility that you may have a cracked cylinder head. Proceed as above, but while the head is off, carefully look for cracks. If the head has a crack it must be replaced.
No. All 4 cylinder Honda Accord's up to and including 2002 use a timing (cam) belt that must be replaced. 2003 and newer Accord 4 cylinders has a timing (cam) chainthat requires no maintenance. All V6 Accord use a belt that must be replaced.
They can be replaced, avoiding the necessity to be 'bored out' .
I have a 4 cyl. Chevy Corsica that needed a coil pack replaced. There are two of them, one goes with the odd number cylinders ( 1 & 3) and the other goes with the even number cylinders (2 & 4) Typically, the number 1 cylinder is the firing cyliinder and if that coil pack is gone, the car should not start. My car is a rarity that actually started and ran on the 2 & 4 cylinders.