Help please
Single handle Delta kitchen faucet.
Several months ago pressure dropped on hot side only, now, several months later the cold side pressure is also low. The faucet and flex lines are approximately 5 years old, the house is 20 years old with PVC and copper.
I have cleaned the aerator and replaced the Delta cartridge but now I’m at a loss especially since the hot & cold dropped separately. TIA!

did you flush the pipes with the guts removed?

Yes I have, I’m wondering if it’s possible that the braided flex lines have collapsed internally (is that even possible?) or if there’s an obstruction in the faucet itself?

more than likely, there is an obstruction.

Thank you!
I think I’ll replace those old shut off valves and if that doesn’t work I’ll replace the flex lines and, finally, the faucet if those don’t work. I appreciate your response!



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FIRST

disconnect the flexes from the faucet and see what they discharge into a bucket

(one at a time)

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



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I did that when this problem started and was isolated to the hot side but I will now do both again before replacing any parts ~ thank you!



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my 'guess' is deteriorated washers in the stops

rebuild or replace the stops as a first step

no harm no foul

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



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I’m sorry, I’m not sure what you mean by 'stop washers' this is a single handle delta faucet with a cartridge that I have already replaced.



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the washers in the 'below the sink' angle stop valves

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Well duh lol- got it! Thanks