My brakes are hard to press while driving - Cars & Trucks

*Hard to shift:
-Possible the shift cable need to be adjusted.
*Brake light is no working unless step(press really hard).
-Need to adjust the brake light switch. It's too closed or stuck.

Mai

Might be a leak on your brake booster (this will most probable give you a hard brake pedal or a "sucking sound " when applying brakes) also check the vacumm pipe from the engine to the brake booster. It might have a leak, so when you press the brakes it influences the air mixture.

You may have lost you brake assist. Look for any disconnected or broken hoses and vacuum leaks especially the one going to the brake booster. make sure that the check valve is good it should allow air through in one direction but not the other. if all checks out good apply vacuum to the power brake booster and make sure it hold if not replace the power brake booster.

If it is hard upon starting that is normal, if varies from hard to soft and vice versa when driving it could be air in brake system (faulty cilinder or gasket)

check your brake booster vacuum hose and check valve for leaks,if no leaks could be bad brake booster if pedal is hard when pressed with engine running.

There is never a test or reason to pump your brakes

Accomplishes absolutely nothing.

There is no pressure in a braking system at all,
until you SLOWLY apply the brake pedal.

Then less than 1" off movement in the master cyl,
will develop 600 to 1800 lbs at the wheels

Release the brake pedal, the system goes to zero,
IT DOES NOT HOLD ANY PRESSURE

To answer your question

You not suppost to press the pedal hard
The saying goes--you apply the brakes,
not force the pedal arm and pin into the
vacuum booster, as though you want to damage it

When your driving what happens ?
You have higher manifold vacuum and
thus your pedal is normal,why the VACUUM
brake booster

Have your brake system inspected, you have a fault somewhere...could be your low on fluid or you need to change your brakes....hard to know without inspecting.
Have a wonderful day.
Larry

the brake power booster diaphram is leaking or the attached hose to it

Is the clunk noticed as soon as the brake pedal is released? Your brake shoes engage in the rear drum when the brake pedal is pressed and then release as the brake pedal is released. Your shoes may be worn and might be "hanging up" for a brief period, that would make a clunk sound your describing

U either have a leaking power brake booster or a loss of vacuum to the booster.