It requires so much force to flush my toilet that I have replaced the lever 6 times in the last few years. There is a vaccum like resistance. What can I do?

Water is not draining completely from the toilet line to the sewage tank. If there is a 'low/little slope' section anywhere in that drain line, solids WILL settle and collect there and cause water to back-up in the toilet drain line. Then the toilet will not flush completely or at all until the 'soft blockage' is cleared out and the drain line emptied. Al 'gravity drain' toilets require a free draining/empty drain line that allows flush water to drain unrestricted. A basement toilet has a pump that 'forces' flush water up and out with enough pressure to sometimes force out the 'soft clog.'

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HOW TO CHANGE A PUSH BUTTON FLUSH UNIT ...

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How to get a water tight seal and a great flush! ... tell you how a to remove and install a push button flush unit on your toilet. ...Top comments.

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follow this steps and fix it. God bless you

f the toilet bowl overflows, use a plunger or auger to eliminate clogs. If the toilet does not flush, tighten or replace the defective handle , adjust or replace the lift chain , or replace the flush mechanism. Jiggling the handle forces the lift chain or rod to re-seat the flush mechanism, telling you that something is awry.

If the bowl drains sluggishly, remove the clog with a plunger or auger, or raise the water level in the tank .

If water runs continuously through the toilet, lower the water level in the tank , adjust or replace a lift chain or wire , repair or replace a worn flush valve , clean or replace the valve seat assembly .

If water appears under the tank, tighten the tank hold-down bolts , lower the water level in the tank, replace the float valve , replace a malfunctioning ball , or tighten nuts on the water supply line, replace leaking supply line . As a last resort, re-seat the toilet .

If the seat is cracked or unsightly, replace it .

If the bowl or tank is cracked or otherwise unacceptable, replace the entire toilet .

Not really. I believe there is a clog in the trap. This happened to us last year. I took the toilet up and found a cloth in the trap ad a pencil. This fixed the problem. Now some traps are poorly designed and meet only minimum specs. Before taking it up, take a hose and force water down it wide open , this could blast out the obstruction.

you can't just replace 1 part in a toilet, your flapper is worn and needs replaced as well.

I am not a toto expert but i think i understand the gravity control toilet concept.A gravity flush tank type toilet flushes do to the force of water traveling from the tank to the bowl in a small passageway and forces the water in the bowl towards the integral trap in the toilet.In other words the water isnt dumping quick enough or the passageway is restricted.,My guess is the flush valve isnt dumping all at once.

This is how it is meant to work!
Short push of lever for small flush, push and hold lever for full flush.

if the toilet has a 'flapper' is there slack in the chain connecting it to the flush arm? The flapper life is usually around 4 years or so - replace it if older.

hello, this is a standard toilet you will need to inspect the flapper that is the rubber flap that holds the water up in the tank it works when you pull the lever it pulls the chain upward and lets the water flow if this flapper is old it may not stay up long enough for the water to flow. open the tank top and flush the toilet see if this flapper is staying up long enough and giving the tank enough time to empty if not change this rubber flapper its inexpensive part.
if this is not the reason then you need to adjust your water filler valve there should be a small screw on top of the pivoting float arm
if you have to adjust it for the water limit line inside the tank this will be the proper amount of water needed to flush once completely

also check that the chain lenth on the pull lever is not pulling the flapper down quicker than its supposed to,

try this let me know your results
hope it helps